1, exhaust black
smoke: Fault found: true failure. Analysis: shows that mixture is too thick,
incomplete combustion. The main reason is the car engine overload, lack of
cylinder pressure, engine temperature is too low, improper carburetor
adjustment, air filter clogging, and individual cylinder ignition does not work
too late and so on. When troubleshooting, should be checked in the choke is
fully open, repair, if necessary; look after the flame from the carburetor main
nozzle opening, if oil pouring or dripping, the float chamber oil level is too
high, should be adjusted to a predetermined range tighten or replace the main
jet; clogged air filter should be cleaned, clear or replacement.
2, the
exhaust pipe of the vehicle exhaust smoke blue: Fault found: true failure.
Analysis: is due to the large number of oil into the cylinder, but can not due
to incomplete combustion. Remove the spark plug, you can find serious carbon
deposition phenomenon. Need to check the dipstick oil level is too high; the
cylinder and the piston gap is too large; piston ring is installed backwards;
the intake duct seals for wear or damage; the cylinder head gasket is ablation,
when necessary, be restored.
3, vehicle
exhaust white smoke, severe cold car, hot car is not white smoke up: Fault
found: false failures. Analysis: This is because gasoline contains water, while
the engine is too cold, then the fuel into the cylinder of incomplete
combustion leads to the formation of dew point or water vapor generating white
smoke. Winter or rainy season when the car first launched, we often see rows of
white smoke. It does not matter, once the engine temperature rises, white smoke
will disappear. This condition does not have to overhaul.
4, engine
noise, step on the accelerator pedal when the vehicle is in place, the
"Long, Long" abnormal sound, vibration sense in the engine
compartment. Failure to determine: Use fault. Analysis: trucks, you can see the
engine toe-boards have bump marks. If there are obstacles and forced through the
pavement, the engine should be bump toe board. Toe plate after deformation
distances near the engine oil pan, if too close, when accelerating pan will
collide with the toe board abnormal noises and body vibration. Therefore, we
must carefully observe traffic in the road, do not cause drag bottom
phenomenon. Treatment: Remove the toe board, flattening correction can be.
5, the
steering wheel of the vehicle is always correct, he left a will, a will right
erratic: Fault found: true failure. Analysis: This is due to the fixed steering
groove in the rubber stopper has been completely damage caused. After the new
stopper refitted, the fault completely disappear.
6. Each time
you open air, which outlet has a very unpleasant odor, the more severe wet
weather: failure to determine: Maintenance fault. Analysis: air conditioning
cooling works by rapid evaporation of a refrigerant absorbs heat, the air
flowing through the temperature drops rapidly. Due to the evaporation
temperature is low, and the air temperature is high, the water molecules in the
air particles on the evaporator condenses into water droplets, and airborne
dust or clothes, hair and other small seat on the substance, easily attached to
the condenser The surface, which can cause mildew, bacteria will multiply. Such
long-term inhalation of air by the body can affect the driver and occupant
health, so air conditioning system air filter should be changed regularly,
clean air ducts.
7, drizzle
windshield wiper is not clean: failure to determine: Maintenance fault.
Analysis: Use the wiper without raining heavily when I feel good, but when the
next rain starts the wipers, you will find the wiper will leave traces in
uneven wipe the glass surface; sometimes get stuck causing poor visibility on
the glass. This situation indicates that the wiper blade has hardened. The
wiper is rotated by the motor energy, by connecting bars into one to one to the
movement, and this force is communicated to the wiper arm. Not part of the
wiper rubber hardening, wipers can not close contact with the glass surface, or
the wiper blade will result in uneven wipe with scars on the form of residual
dirt. Replace wiper or wiper film surface is very simple. However, the
replacement should be noted that different models and years, different installation
methods and length of the wiper. Some wiper replacement film is very simple.
However, the replacement should be noted that different models and years,
different installation methods and length of the wiper. Some only need to
replace the wiper blade rubber, while others need to replace the whole
windshield wiper.
8, vehicle noise:
Fault found: false failures. Analysis: Whether it is luxury cars, low-end cars,
imported cars, domestic cars, new cars, used cars are varying degrees of noise
problems. Interior noise mainly from the engine noise, wind noise, body
resonance, suspension and tire noise is the sound of five aspects. Vehicle, the
engine speeds, the noise through the firewall, end walls and other incoming
car; car on bumpy roads resonance generated by the body, or open windows at
high speeds can not produce resonance will become noise. Due to the narrow
interior space, noise can not be effectively absorbed, hit each other at times,
a resonance phenomenon in the car. Driving, the car's suspension system and
tire noise generated by the noise generated will be passed through the car
chassis. Suspension in different ways, different tire brands, different tire
tread, tire pressure different noise generated is also somewhat different;
different body shape and different speed, wind noise the size of its generation
is different. In general, travel speed, the greater the wind noise.
9, the operation
of the engine temperature suddenly too high: Fault found: true failure.
Analysis: If the vehicle during operation, the coolant temperature gauge
indicates the position quickly reach 100 ℃ or during cold crank, the engine
coolant temperature rises rapidly to boiling coolant in the supplement to
normal, but engine power decreased, indicating that the engine mechanical
system failure. Most causes of such failures is: Cooling serious leakage; cut
off the water jacket and the cylinder head gasket to be washed out; the
thermostat off the main valve; fan drive belt loose or broken; pump shaft and
impeller loose; fan clutch operation bad.
10, when the
vehicle is accelerating oil pressure indicator lights: Fault found: true, false
failures coexist. Analysis: machine oil lamp lit in both cases there are real
and imaginary. The so-called real, is really low oil pressure, low level of the
indicator warning, indicating that the correct lubrication system failure, must
be excluded. The so-called virtual, just as suspected, oil lubrication system
is not a fault, but the oil pressure light on the system fails, the wrong place
bright lights. Although this failure will not affect the normal operation of
the engine, but also to find the root cause should be excluded for the better.
Often the real possibility of a larger disease, should be judged as a failure
of the main ideas.
11, the whole car
shake phenomenon vehicle at high speeds: Fault found: true failure. Analysis:
vehicle during normal driving to 96km / h or so when, the whole car shake
phenomenon occurs, reduce speed, the phenomenon will disappear, if more time is
accelerated to 90km / h or so legend has emerged shake the car chassis is
defective. Its causes are: tire balancing misalignment; front and rear
suspension, steering, transmission and other institutions loose; wheel
alignment, wheelbase inaccurate; axle gap is too large. First, the tire
balancing misalignment will scroll wheel side even beat driving, which is the
main reason causing the whole car shake. Secondly, the suspension mechanism,
steering mechanism, transmission mechanism Songkuang loose, causing the toe value,
wheelbase inaccurate, steel spring is too soft, causing the vehicle is in
motion resonance, induced the whole car shake. Again, axle gap is too large,
irregularly after making of motion during running, increased wear, resulting in
unbalanced rotating mass, causing the whole car shake. More trouble if not
promptly removed, leading to a vicious cycle and lead to other problems.
12, when the
vehicle turns, turn the steering wheel but obviously turn into a small corner,
obviously turn the steering wheel is a small but turning into a big turn: Fault
found: true failure. Analysis: steering occurs when two phenomena called
understeer former, the latter known as oversteer, the steering system described
problems. The driver's side of the vehicle steering bypass feeling of
acceleration when one side is: a lack of steering performance of the car will
travel outward side, with oversteer performance cars will travel the inside.
When traveling radius becomes larger, it is known as understeer. When driving
radius decreases, known as oversteer. There is also a shift phenomenon,
initially understeer, oversteer in the middle turned into a sharp turn inward.
This is the most dangerous reversal of the phenomenon, accident prone. This
situation occurs only on the individual rear-engine car.
13, the engine
cold start difficulties, after starting the engine vibration, and then leveled
off, low speed when the engine began to shake, improved high speed. Fault
found: true failure. Causes: It may be premature spark plug failure or ignition
timing. If it is not the fault of the spark plug, the ignition timing is too
early to judge. If the ignition timing too early, in the flash of an instant
spark, the piston away from TDC, the pressure and temperature of the mixture in
the cylinder is not high, resulting in the formation of a slow flame, and the
flame propagation speed is low is formed, in this during a portion of the
mixture from the combustion chamber spark plug far less than waiting for the
spark plug came the fire, it has been due to the fuel mixture temperature
radiation and expansion automatic burn up, causing deflagration, detonation
causes engine shake in low speed serious. When the failure occurs, it is timely
to the repair shop for repairs.
14, the engine is
not running smoothly, often accompanied by a "sudden, sudden" sound,
lack of engine power during acceleration, issued a "Peng Peng" put
guns often, exhaust black smoke. Fault found: true failure. Analysis: There may
be a carburetor and platinum fault or ignition timing too late. If the ignition
timing is too late, when the engine piston from the point close to the top dead
center, the spark plug firing began, mixture combustion lag, incomplete
combustion piston down even when the door is opened when the exhaust gas mixture
still burning, combustion chamber volume expansion and lagged inflation gas,
causing the cylinder pressure is not high, the engine power down. Part of the
mixed gas combustion and expansion may also return through the intake valve
carburetor, resulting in tempering phenomenon, issued severe "Peng
Peng" sound, incomplete combustion gas mixture Black smoke from the
exhaust pipe. When the failure occurs, it is timely to the repair shop for
repairs.
15, in the winter
cold, the car park over time, the engine starting more difficult: Fault found:
false failures. Analysis: due to low temperatures, fuel gasification rate
decline, the mixture thinning and nonflammable difficult start. At the same
time due to low temperatures, oil viscosity increases, increasing the engine
running resistance and difficult start. In addition, the chemical reaction of
the battery electrolyte slow, resulting in the start output power is low,
starter ignition voltage power shortage and inadequate, difficult to start the
engine. So, the car should be preceded by a cold start of the season for the
engine to warm up. Pourable water jacket to the radiator and hot water or
steam, the use of the water jacket in the cylinder wall temperature
conductivity to make into the starting cylinder fuel easy to gasification, can
raise the temperature of the combustible mixture to facilitate combustion. But
also it required the battery to warm up to increase battery power, increase the
starting current and ignition voltage.
16, car steering
wheel are empty and heavy-duty swing when traveling on a flat road surface and
swing more serious. Fault found: true failure. Analysis: generally due before
the beam does not meet the technical standards and straight horizontal rod
ball, turned inside the machine with the gap is too large or worn steering gear
mounting bolts loose, knuckle pin and bushing wear caused by excessive.
Synthesis of the above-described torque causes Songkuang formed, will push
swing around the steering wheel.
17, while driving
a car encounters a failure that is caused by the steering wheel swing and swing
heavy car is more serious: Fault found: true failure. Analysis: Under normal
circumstances due to the uneven front tire wear, make use of the new tires or
mats and uneven tire rims caused by deformation. Because, when the wheel speed
faster, driven mainly from the steering wheel rotational torque to tires or
rims of the yaw rate. When the pendulum poor tires or rims more than 3 mm, yaw
torque can drive around the steering wheel wobble. You should go to the repair
shop inspection, as appropriate, the replacement of tires or rims.
18, on a good road
at high speed, heavy, empty car steering wheel were rocking, heavy car swing
serious, and the faster the speed, the more severe the swing: Fault found: true
failure. Analysis: generally due to the brake drum and the hub connecting bolts
loose wheel bearings and brake drum Songkuang hole boring off-center leaving a
brake drum of varying thickness, the amount due to an imbalance. Because, at
high speed, the wheel speed quickly, driven mainly from the steering wheel
torque swing brake the rotation uniformity and balance of the drum and the hub,
the role of unbalance inertia and anteversion were produced swing drive
steering wheel torque.
19, when the
clutch loose fit some jitter: Fault found: true failure. Analysis: Description
of the clutch fork, release bearing, pressure plate and friction discs serious
wear and tear, splitter without oil, before telescopic shaft and bearing severe
wear flowers, ground black, splitter cover seal is bad burn . Cause of the
above situation can only have two, one is a problem between the transmission
axis positioning, causing the shaft is not parallel; the other is between its
axis gap is too large.
20, unscrew the
radiator cap found there are always some oil floating on the water, and found
that the water when changing the oil. Fault found: true failure. Analysis:
There are two cycle engine system, a cooling fluid circulation system, the
other is the oil circulation system, the two systems are not mutually
penetrating. If there is oil or water in the water, indicating a two loop
system where there is a problem isolation. "Oil into the water" and
"water into the oil" is the fault of two different properties. Once
the engine is running, the oil pressure is always higher than the pressure of
the cooling water, so the oil can easily enter the cooling water from a crack
in the cylinder, on the contrary, the cooling water is not easy to enter the
oil, so oil into the water to fall within the drain phenomenon: a cylinder a
position oil passage cracking, oil through the crack gap is
"squeezed" into the cooling water channel, because of the oil is
lighter than water, unscrew the radiator cap can be found on the oil slick. The
oil belongs to another aqueous nature of the problem, which is due to cracking
or other external causes cylinder liner, the cooling water is mixed into the
engine oil sump. Therefore, the "oil into the water" is the engine
block itself is out of order, and the "water into the oil" is mostly
engine parts caused by the nature of the failure is not the same.
21, buy a new
vehicle engine shake severe, sometimes fault indicator will occasionally
flashes: Fault found: false failures. Analysis: Some new cars have this case,
the vehicle engine shake severe, sometimes fault indicator will occasionally
flashes. Many people suspect vehicle quality problems, in fact, the real reason
is dirty fuel supply system has led to contamination or blockage. At present,
some advanced vehicle equipped with emission monitoring system, because such a
control system can be very sensitive detection of vehicle emissions and fuel
clean condition, so the use of dirty fuel will lead to fuel supply, ignition,
exhaust system contamination, which led to the engine fault indicator lights
and varying degrees of engine shake. So effective solution is: thoroughly clean
the contaminated system, continue to add stability index performance of gasoline
and add a quantity of the oil cleaner, the situation can be improved.
22, power window
lift speed of each door is not the same: Fault found: false failures. Analysis:
generally due to the glass elevator to enter orbit in some dust, so that the
frictional resistance between the glass and the groove becomes larger, and
produce such a result. This is not much of a problem, as long as the
appropriate cleaning can solve the problem. Recommendations to the professional
repair station operations, if you want to do it yourself, you should use a
professional rubber cleaning agent. Because electric windows surrounded by many
rubber seals, if the choice of cleaning agents improperly, rubber corrosion,
the sealing strip deterioration, cracking, and thus lose their effect, window
sealing decline.
23, when the
automatic transmission car linked D position, the car has a slight vibration:
Fault found: false failures. Analysis: When the vehicle is ready to start, when
the automatic transmission link into the D position, under the action of the
torque converter, friction plates engage first gear, generating a driving force
forward, but this time due to the brake pedal This prevents the forward force,
causing a slight vibration of the car. If the vibration is too large, there may
be friction pad wear a forward gear transmission, need to overhaul the
transmission; there may be an automatic transmission engine support or support
pad damage, Su resonance caused by engine misfire. So, pay attention to the
usual state of the vehicle in order to detect anomalies.
24, engine oil
just replaced not long darkened: diagnosis: false failures. Analysis: There are
two reasons mainly black. First, because the role of clean dispersant, followed
by the use of oil is oxidized. If an oil change in the use of black, indicating
that the oil did not play its normal cleaning effect. The current oil generally
contain detergent dispersant and absorption of coke and oil combustion oxides
to change the oil change to ensure internal engine cleanliness. So, just
replace the black oil is not necessarily caused by the engine inside dirty, oil
change time can be as long as required. Note: Be sure to schedule an oil change
and oil filter (or cartridge). After the oil is used for a period of time, the
viscosity of the oil thickens and produces an acidic product, such as
occasional replacement will damage engine components, affecting the normal
operation of the engine.
25, the engine oil
pressure indicator display abnormal: Fault found: true failure. Analysis: When
the table pointer display oil pressure is not normal, indicating that the
engine is defective. If the oil pressure is low or the table pointer display
meter pointer display fluctuations, may be due to pump wear and dirt filter is
blocked, suction strainer set to expose the oil, low oil level, oil mixed with
air and a pressure gauge malfunction and other causes. In addition, the oil
viscosity is low, oil seals and poor lubrication, the lubricating oil viscosity
is too cold, too much lubricating oil sludge deposits, etc. can also cause
abnormal oil pressure indicator display.
26, excessive
engine oil consumption: Fault found: true failure. Analysis: attentive friends
will find that the lubricant in good condition, there is the case of normal
consumption, but some poor condition when the car's exhaust emissions of blue
smoke, in fact, which means that oil consumption is too large, the general to
He said oil consumption no more than two cases, participate in the combustion
into the combustion chamber, or oil leakage. The reason why oil fleeing into
the combustion chamber can, mainly because of serious wear and tear parts, the
gap is too large, or the oil pressure is too high, leading to the oil coming
into the combustion chamber. The oil leakage mainly because seals harden aging,
valve stuck. If you are older vehicles, there are generally seals due to
circumstances Mifengbuyan aging. Encountered above, you preferably by a
professional conservation center, the conservation engineers determine and
implement effective solutions.
27, after a period
of time a part of the engine oil consumption: Fault found: false failures.
Analysis: national standards, the vehicle is traveling 10,000 km of normal wear
and tear should be less than the amount of oil 1L. General car engine oil
capacity is about 4L, when the oil level reaches the oil dipstick marking MIN
at the lack of oil but 0.5-1L. If the car within ten thousand kilometers of oil
loss in less than 1L is normal wear and tear, it is not considered a failure.
28, on the
crankcase vent hole clogging: Fault found: true failure. Analysis: When the
engine is working, there is always a gap portion of combustible gas and waste
gas piston rings and cylinder wall into the crankcase. Into the crankcase oil
dilution of fuel vapor will condense in the exhaust gas acids and water vapor
will erode parts, oil performance, make changes, so that the oil gradually lose
their effectiveness. In addition, the gas enters the crankcase of the
crankshaft inside temperature and pressure were increased, resulting in oil
from the seals, glands etc. leaking. Due to the reciprocating motion of the
piston, the gas pressure in the crankcase fluctuated, affecting the normal
operation of the engine. Severe sneaked into the crankcase oil will within the combustion
chamber and the cylinder head cover, will spill from the fuel filler opening or
dipstick in gaps. To avoid the phenomenon of the above conditions, the engine
is provided with ventilation means, in order to balance the crankcase, the air
pressure outside. Arise in the use of burning oil, oil leakage along the
joints, premature deterioration of the oil and the engine idling unstable and
so, you should check whether the crankcase ventilation effectively, should
ensure that the vent open. And the negative pressure valve can not be deformed,
adhesion or installed wrong, not bent or blocked breathing tube, the check
valve can not hold against.
29, the engine
throttle body and idle speed motor dirty: Fault found: true failure. Analysis:
current car engine idling is installed in the throttle body askance by the idle
speed stepper motor control. The engine is running, since the air quality and
fuel quality reasons, will cause the throttle and idle valve engine throttle
body plot has many dirt, when dirt is severe, the engine idle speed will be too
low, the stability is poor or no idling throttle there is issuing phenomenon
refueling. Therefore, when each driving cars in general about 20000km, cleaned
and throttle body. After cleaning the engine should be set so as to achieve
normal operation through diagnostic.
30, when the
vehicle hard acceleration, the speed will not lift. Fault found: true failure.
Analysis: car driving, slow acceleration when the car accelerated normal, hard
acceleration when the speed does not improve immediately, you can not overtake.
Possible causes for the engine fuel supply system failure, oil pressure, fuel
injection, ignition timing does not meet specifications, spark plugs and
high-voltage fault. Actual case: There is a car presence of the phenomenon. A
rapid acceleration of the engine short rotation experiment also found no
abnormalities. Check engine fuel supply system of hydraulic, fuel injection
amount so normal, read data stream indicates a failure in the ignition system.
Check the ignition timing compliant, replace the spark plug, the fault
persists. Finally, check to make sure that the high-speed high-voltage spark is
not strong enough. High resistance range measuring resistance value of each
cylinder high-voltage with a multimeter, both in 25Ω. Due to the high-speed,
large load on the engine required a strong ignition energy, and the central
high-voltage resistance value is too large, resulting in ignition energy
attenuation, high-pressure fire weak, causing the engine to accelerate
weakness. For a set of new high-voltage lines, troubleshooting.
31, carburetor car
engine hot car is not easy to start: Fault found: true failure. Analysis: If
the engine is hot car status is not easy to start, which is the automatic choke
system malfunctioned, causing the choke does not automatically open or not
fully open. The vehicle is traveling, because the throttle opening is large,
and therefore at high inlet pressure, air flow impact choke off the center axis
so that the choke this time to fully open, but at low engine speeds or idling,
festival valve opening is small, so the intake pressure is not choke this time
only partially open or the opening of a small state. In the role of the choke,
thick air mixture into the cylinder, this time when the engine stops running,
the choke will close, and so on and then start the engine, overly rich mixture
into the cylinder the spark plug wet, so that the engine is difficult to start
. When you encounter this situation can be taken to all of the accelerator
pedal depressed, the choke and throttle fully open, turn the starter, by
inhalation of fresh air to dilute the mixture too thick, the engine is started.
Severe flooding when the spark plug wet, remove the dry, but it is important to
go to the repair shop to find out the cause of the choke can not fully open.
32, when the
vehicle is traveling at high speed in the exhaust black smoke: Fault found:
true failure. Analysis: Under normal circumstances, the vehicle, the driver's
own high-speed black smoke into the imperceptible. However, you can use the
calculation to determine the fuel consumption. Carburetor engine caused mainly
by the following four reasons: oil level is too high, causing the mixture is
too thick; a vacuum fuel malfunction, unduly enriched mixture; main air jet
foam tube blockage; air filter clogging . Attorney air filter should first
clogging. If clogged, will be ranked in the high-speed black smoke, power,
economy deteriorates, it should replace the air filter. Then check the
carburetor, the operation requires specialized personnel. There is the ignition
system and engine to an overall test.
33, when the
winter, the vehicle can not open the sunroof: Fault found: false failures.
Analysis: In the winter, the outdoor parking of vehicles, the car the night
before because of higher temperatures cause falling snow melted around the
skylight, and after overnight, reducing the overall temperature of the vehicle,
the hydraulic ice melted snow, so, very easy to make the glass window and
sealants freeze frame. As easy to force open the sunroof sunroof motor and the
rubber seal is damaged, and therefore have to wait until the interior
temperature rises confirmation thaw and then open sunroof. Similarly, winter
car wash, even if not completely wipe hot water washing, vehicles in the roof
edge residual moisture will freeze, it should open the sunroof after washing so
dry around water. In addition, the sunroof sealing strip surface after painting
or flocking, in order to avoid freeze, paint handling dry with a soft cloth
tape is best, then coated with some talcum powder. The tape flocking to dry, do
not glue oil.
34, when heavy
steering effort: Fault found: true failure. Analysis: The reasons are various
parts of the steering system rolling bearings and plain bearings too tight,
poor bearing lubrication; drag link, tie rod ball stud adjusted too tight or
short of oil; steering shaft and casing bent, resulting in catching; before
bundle improperly adjusted wheel; front axle vehicle or frame bent, deformed.
Further steering wheel tire air loss, wheel alignment can also cause hard
steering inaccurate data.
35, with the
steering wheel when the vehicle is difficult to manipulate: Fault found: true
failure. Analysis: both sides of the front wheel may be inconsistent with the
specifications or pressure; both sides of the rear wheel caster or camber are
not equal; the front sides of the hub bearing clearance inconsistent; both
sides of the leaf spring or elastic camber inconsistent ; left and right sides
of wheelbase difference is too large; the wheel brake gap is too small or brake
drum out of round, causing one side of the brake card, dragging the brake;
vehicle loading and uneven.
36, when driving
the vehicle to "Floating": Fault found: true failure. Analysis: often
made with the front wheel "swing" caused by reasons: shimming front
tire or vehicle repair resulting total success balance is destroyed; drive
shaft assembly there are loose parts; shaft assembly balancing is sabotage;
damper failure; steel spring stiffness is inconsistent; steering engine wear
loose; improper wheel alignment.
37, usually normal
driving, but sometimes at a slow stop, emergency braking feeling, a sense of
dragging the start; fuel consumption is large speed, the speed is limited:
Fault found: true failure. Analysis: may be a fault in the brake master
cylinder. Actual case: a car playback of the phenomenon, will play a car
branch, dismantling each brake, brake wheel cylinders, calipers rails and hand
brake cable etc. and found no abnormalities. Road test also found no
abnormalities. After some time, the failure again, and do not move without
braking pushed down. Touching two wheels, obviously overheating. After
connecting the master cylinder and the bolt release vacuum booster, brake
release, the car can be driven. Remove the master cylinder, booster push rod
with a tool to measure the length and depth of the master cylinder piston, we
found no gap between the two. This allows the master cylinder oil return is not
complete, resulting in brake dragging. After padded and adjust the gap between
the master cylinder and booster car loaded retest, troubleshooting.
38, driving the
engine has knock loud, especially when accelerating clear: Fault found: true
failure. Analysis: knocking sound similar to the sound resounded through the
valve stem or "Titicaca" sound. Since most of the new engines use
hydraulic tappets, valve stem clearance does not happen too much noise, it is
actually a knocking sound. This sounds more due to the use of low-grade fuel
due. To eliminate this failure must be more in line with the requirements of
high-grade fuel. This abnormal sound in Cherokee car the most obvious. If you
can not meet the requirements of the moment to buy fuel, then respond
appropriately adjust the ignition timing.
39, the engine
hydraulic tappet ring: Fault found: true failure. Analysis: fitted with
hydraulic tappet engine, no need to adjust the valve clearance, but since the
hydraulic tappets function decline or other factors, and sometimes there is
abnormal sound occurs. When the engine is idling, the engine central hydraulic
valve tappet side will hear a "click" sound. Sound law is not
obvious, after the sound of the engine speed increase or decrease clutter
disappears at high speed. Obviously cold, hot car sound waning. If the test off
the fire, the sound is still there. This sounds easy to misjudge that mistaken
other parts of the metal percussion, thus causing the reader's attention. The
reason is abnormal sound hydraulic tappet plunger wear, valve leakage, very
inadequate supply column oil pressure, the plunger and the very cylinder
blocked oil. When troubleshooting, wear, leakage serious parts should be
replaced. Wear lighter components can continue to use through repair.
40, the vacuum
hose leaks sound: Fault found: true failure. Analysis: In use, due to the aging
loose vacuum hose, loss and distortion, at idle, the upper part of the engine
will hear a "hissing" sound leakage, as speed increases, the sound
gradually disappear, cold machine, heat engine noise change. Meanwhile, when
the engine is idling, accompanied by "chug" sound, some Annex is not
enough because the vacuum does not work, the sound is small, but there are
risks. The failure is due to loose vacuum hose, after shedding a vacuum because
the engine is running, there is a large vacuum tube joints intake air flow
generated sound. To troubleshoot the method is relatively simple, check the
vacuum hose, pipe joints with or without deformation aging, cracking, falling,
if damaged should be replaced with new parts.
41, black circle
wheel: Fault found: false failures. Analysis: black circle because the wheel
brake when braking, brake calipers and wheel disc friction wear some charcoal,
charcoal powder which if not removed, because aluminum wheels wheels will heat,
these Heat causes toner on the surface of coke alloy wheels, it becomes a layer
of dark brown hard surface, the water can not always fall. Because the front
wheel braking, the vehicle center of gravity forward, all the weight is
concentrated to the front brake before causing heavy burden, which is the
front-wheel brake wear down a lot more than the rear Toner reason to avoid this
The phenomenon, we must frequently wash wheels.
42, driving the
same brand of car, why other people's cars burn less oil, while his car was
burning oil and more: Fault found: false failures. Analysis: First, the car in
the rugged, steep bend on the road and more magnanimous than the flat smooth
surface with low friction oil consumption to be more; the car in the sand, the
soil surface than cement, asphalt the quality of roads to be more fuel; car
traveling in the downtown than in the suburbs with fuel to be more. Downtown
complex road car and often encounter traffic jams, low speed, and the suburbs
relatively good road conditions, the car can keep pace with the economy.
Secondly, you should always check the cylinder pressure changes, spark plugs
and fuel systems work working status, whether the engine is selecting the ideal
mixture concentration and proper ignition timing, these are the key decision of
how much fuel consumption.
43, the front
windshield winter fog: Fault found: false failures. Analysis: driving a vehicle
in the winter, especially just a few people on the bus, the inside of the front
windshield fogging easily affected by line of sight, even if constantly rub, or
continue to have fog, particularly affecting driving safety. Following is a
brief rapid demisting and anti-fog method: rapid demisting can turn on the AC
switch, outlet selector knob to blow the windscreen position, three or more
closed or reduced outlet, the air volume adjustment knob rotation to the
appropriate location. If the outside air is dry, the air is good, the intake
should be selected from outside the vehicle, on the contrary can choose the
interior air circulation. The temperature control knob to the right position so
that the inside temperature comfortable. Glass anti-fog anti-fog agent
dedicated glass, supermarket or car shop on sale, the price is not expensive,
very good. Without a special anti-fog agent glass, you can also use household
glass detergent or detergent instead, it would wet a clean cloth, wipe the
windshield inner surface, then wipe clean the glass can also play the role of
anti-fog.
44, when the slope
stop, sometimes "P" shift position of the shift can not move: Fault
found: false failures. Analysis: Sometimes hill after parking the vehicle
again, "P" shift position can not move the file to start the engine
when the phenomenon. This is because we usually are the first stop after
depressing the brake, the stalls down "P" shift position, lift the
rear brake pedal, the vehicle will move because of the weight, resulting in
mechanical locking transmission within the "claw" force card slot in
the claw due cause occurs when moving files to effortlessly feeling. This is
not a fault, the appropriate procedure would avoid such a situation.
45, from the mist
inside the headlamp: Fault found: true failure. Analysis: After the headlight
cover breathable passage of a plastic or rubber, this passage in the headlamp
structure must exist, or the thermal expansion of the gas can not be excluded
that this ventilation channel can only be a gas can not water. If a slight haze
phenomenon, after air circulation or open headlamp will soon dispersed, if
there is always water or mist not afford to loose you need to go to a
professional car repair workshop excluded.
46, uneven road
vehicle travel or the "creak" sound isolation through the
deceleration zone: Fault found: false failures. Analysis: Under normal
circumstances, whether new or used car, or when you walk through the uneven
pavement road deceleration buffer zone, will have a "creak" sound.
The new car will be less sound, old cars will be larger, it is not a
malfunction. This is due to the current cars have adopted independent
suspension structure, in order to achieve damping portion connected with a rubber
parts vibration when the vehicle reaches a certain extent, due to deformation
of rubber parts and sound, when the amplitude of oscillation is relatively
small , the sound is relatively small.
47, when the
clutch pedal slightly "creak" sound: Fault found: false failures.
Analysis: Some vehicles at the time of the clutch pedal, always will be issued
similar to "squeak, squeak" sound, it is annoying, but also thought
it was a clutch failure, this phenomenon is due to the support shaft due to the
long clutch pedal The slight wear and tear caused by the use of the general
office of the support shaft apply some lubricant on it.
48, the liquid
level in the brake master cylinder cup of oil continue to decrease with the use
of: Fault found: false failures. Analysis: Some friends often careful cleaning,
inspection of vehicles. Will find the brake fluid level in the brake fluid cup
constantly low, this is not a malfunction. This is because with the use of the
vehicle, the brake pads gradually wear thin, the brake fluid in the master
cylinder cup oil continues into the brake cylinder, which is normal, when the
replacement of brake pads, brake fluid level it can return to its original
height of.
49, there is a
slight "leak" sound when the brake pedal: Fault found: false
failures. Analysis: This is the sound emitted by the vacuum booster. Vacuum
brake booster works with the atmospheric pressure difference between the
negative pressure produced when using the engine working between turbocharger
to force the inner rubber diaphragm to move, push the brake master cylinder
piston, in order to relieve the driver the brake pedal force. When not step on
the brake pedal, the engine intake manifold negative pressure is introduced
into the cavity on both sides of the diaphragm, the pressure balance, so
booster does not work, when the brake pedal, booster rubber diaphragm cavity
The vacuum hole is closed, and open the air holes allow outside air to enter
the cavity pressure greater than atmospheric pressure due to the other chamber,
forcing the rubber diaphragm to move and drive the brake master cylinder piston
moves, which play a supercharging effect.
50, when the brake
pedal, shift lever at the "clicking" sound: Fault found: false
failures. Analysis: automatic transmission shift lever to prevent misuse of
vehicles generally have features to prevent a driver or vehicle occupant due to
misuse a security incident. Therefore, in the "P" shift position
without the brake pedal is not moving the shift lever. The shift lever at the
"clicking" sound is the sound of the solenoid valve action, every
step on the brake pedal once, the solenoid valve will be audible.
51, the clutch
pedal is depressed amount of hours, holding stalls not happy, and sometimes
when you hang gear impacts. Fault found: false failures. Analysis: Some cars
use a clutch cable style. When there will be a period of time after the clutch
pedal gradually becomes lower, feeling the clutch stroke short, not happy when
hanging files, sometimes when you hang gear impacts. This is because the cable
adjuster lock nut fixing the clutch pedal with the increase in the number of
threads caused by automatic rotation. This is not a fault, just a little
rotationally fixed locking nut on it.
52, when the fuel,
the engine speed increases but the speed did not improve: Fault found: true
failure. Analysis: When the vehicle if the vehicle is accelerating discovery,
especially when rapid acceleration of the vehicle can not be increased as the
engine speed and acceleration, the manual transmission, it is usually due to
damage caused by the clutch plate. Automatic transmission vehicle is generally
due to the friction plates caused damage within the transmission. At this point
you can not speed up traffic, and in order to avoid greater economic losses.
They should seek help or slowly the vehicle to the repair station for repairs.
53, door glass
when lifting, there is a slight "Gala" sound: failure to determine:
Maintenance fault. Analysis: Cars in use for some time will appear when the
door glass lift, there is a slight "Gala" sound. Especially the
driver's side of the grave. This is mainly because a large north wind often
glass door in place and remain in contact with the sealing strip some fine dust
and gravel, causing noise when the glass elevator. Then it must promptly clean
sealing tape and slide down the door glass dust tank, otherwise it will scratch
the glass door.
54, when the seat
belt is not freely withdraw: Fault found: false failures. Analysis: Some
automatic roll-back of the vehicle seat belt will appear after a period of time
can not be recovered later when the seat belt release, usually this is because
the seat belt caused by dirty, as long as doing the cleaning will be solved.
55, when the turn
signal lights, blinking frequency faster than usual: Fault found: true failure.
Analysis: When moving the turn signal lever, the steering on the dashboard
indicator lights flash frequency faster than usual, it is the fault. Usually on
one side of the steering due after the lamp is broken, because the line of
resistance changes caused. When your vehicle When this behavior occurs, must be
timely check and replace, to ensure traffic safety.
56, the air
conditioning turned the engine when the vehicle speed does not change: Fault
found: false failures. Analysis: air conditioning when the engine speed has
increased in normal vehicle, which is to meet the load requirements of the air
conditioning compressor, keep the engine idling stability. However, many of the
new vehicle configuration engine, the air conditioning when the engine is not
to improve the speed, but on the increase in engine injector fuel injection
time to maintain the stability of the engine idle speed. Therefore, no air
conditioning when the engine speed is not necessarily the fault.
57, the air
conditioning vent air volume is small: failure to determine: Maintenance fault.
Analysis: outlet air flow inside the vehicle with the use of the vehicle will
appear at the same fan speed progressively smaller amount of wind phenomenon,
while the cooling effect is reduced. Usually this is because many new cars are
equipped with air filters, the purpose is installed inside the vehicle in order
to maintain access to clean air, which also makes air conditioning evaporator
to keep clean, get the best cooling effect. Will be covered with dust filter
after a period of time resulting in reduced permeability, followed by the outlet
air flow also decreased. Therefore, as long as the replacement of the filter
problem is solved.
58, the vehicle
rear door does not open from the inside: Fault found: false failures. Analysis:
The current cars are generally at the back door of the vehicle fitted with
child locks to prevent children ride in the back seat due to misuse of the door
open, a security incident. Many people in the lack of attention to cleaning
vehicle, moving the child lock handle, ride in the back seat occupant appeared
from the inside to open the door. This is not a fault, just open the door from
the outside of the vehicle and then moved to the child lock in the open
position the handle on it.
59, winter
morning, sometimes the doors can not be opened: Fault found: false failures.
Analysis: After washing the winter, on the open-air vehicle often can not open
the door of the phenomenon, which is not a fault, is due to washing residual
moisture left on the sealing strip Siemens, causing adhesions after the water
freezes cause. If the adhesion is not very serious, it can take the way to
force the door open open. If the situation is very serious adhesions, forced
open will damage the door seal strip.
60, door key
winter morning sometimes can not rotate: Fault found: false failures. Analysis:
After washing the winter, often in the open-air vehicle door key phenomenon can
not be rotated. This is not a failure, is due to residual water washing into
the key hole caused when the key is inserted into the keyhole, which the
locking mechanism can not bounce, there can not twist the key. At this point,
do not vigorously to twist, otherwise it will cause damage or deformation of
the keys can not be used. Should be taken to use the remote control to open the
door or open the door heating.
61, an automatic
transmission vehicle does not step on the brake pedal lever can not move: Fault
found: false failures. Analysis: This is a feature designed for safety, not a
malfunction. When the ignition switch is not turned on, the brake pedal is not
depressed or remove the ignition key, the shift lever can not be withdrawn from
the P position. If you need to quit, you can press the emergency button to
release the lock of the shift lever. If the phase shift is not in the P
position, the ignition key can not go LOCK locked position. When the ignition
switch is turned on, it must depress the brake pedal in order to change the
shift lever from the P position to other positions. Because the guide pins must
reach to make unlocking, it also needs to press the button on the shift lever.
62 vehicles with
ABS braking in an emergency, a "quack" noise: Fault found: false
failures. Analysis: vehicles with ABS, emergency braking, a "quack"
noise, which is the normal sound of ABS issued at reduced pressure to perform
pump operation, at the same time, the brake pedal will be accompanied by the
beating of the upper and lower shells foot feeling. When the wheel braking,
sensors mounted on the wheel immediately to sense whether the wheels from
locking, and signals to the computer. For locking the wheels, the computer
immediately reduce the braking force to the wheel, and the wheel continued to
rotate, rotate to a certain extent, the computer applies the brakes and issue
commands to ensure that both braked and the wheels will not lock. Such repeated
until the car was completely stopped. A second between the computer can detect
hundreds of wheels and brake system while dozens of manipulation, however, ABS
emergency braking only works as long as, in general, work or ordinary braking
system.
63, when the
opening warm winter windscreen mist, accompanied by sweet: Fault found: true
failure. Analysis: This phenomenon occurs when you use hot air vehicle,
generally due to the cab heating tank slight leakage. Windshield mist on the
wind generated by the blower drive the car sinks leaked antifreeze blowing
duct, due to condensation on the front windshield, but people can feel a
special anti-icing fluid flavor. It should turn off the fan, the fog gradually
dispersed. But to timely repair to a professional repair shop.
Label:
Label:
