Chery QQ Service Manual 465 Engine Mechanical System
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Chery Automobile Co., Ltd
The following diagnosis touches upon the common problems or possible causes.
You can fix a breakdown through adjustment and maintenance or replacement according to the
request, after carrying out the correct diagnosis.
This malfunction diagnosis schedule will be helpful for diagnosing engine misfire resulting
from mechanism problems such as camshaft malfunction, bearing wear or being damage and
connecting rod being bent.
This schedule doesn’t include the driving elements malfunction such as injector malfunction.
Check the motive system inside diagnosis system
You should check the initial information first, then contrast the specified classification while
carrying out the basic diagnosis of engine misfire according to this schedule.
Initial check
1.Check the following conditions with eyes:
l
Engine flywheel or crankshaft pulley looseness or installation is not
correct.
l
There are some damaged or malpositioned parts of driving system.
2. Listen to the inside of engine to see whether or not there is any
abnormal noise.
3. Check to see whether or not the oil pressure of engine is suitable
4. Check to see whether or not the oil consumption is too much.
5. Check to see whether or not the coolant consumption of engine is too
much.
6. Do compression test for the engine.
Inlet manifold leak
Inlet manifold which generates vacuum leakage will cause misfire of
engine
Check the following conditions:
l
Vacuum hose pipe installation is not correct or damaged
l
There are something wrong with the inlet manifold or gasket or
installation is not correct
l
There are some cracks or damage in the inlet manifold, throttle or
gasket installation is not correct.
l
Inlet manifold warp
l
The sealing surface of cylinder head warp or being damaged.
Coolant
consumption
Coolant consumption may be but not certain result in engine over heated
Check the following circumstances:
l
Coolant leak
l
Cylinder head gasket fault
l
Cylinder head warp
l
There are some cracks on the cylinder head.
l
Engine body is damaged.
l
The length of cylinder head bolt is not correct.
Fuel consumption
1 Fuel consumption may be but not certain result in engine misfire.
2 Remove out spark plug and check to see whether or not there is any oil
stain in the spark plug.
3 Carry out cylinder pressure test or cylinder leakage test.