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f)
Check whether the clearance of crankshaft position sensor is too large.
16.4.3.3 Symptom - Startup failure with exhaust failure
a)
Check whether the high voltage wire of ignition coil is loose,
b)
Verify whether the ring gear is loose.
16.4.3.4 Symptom - Unstable idle speed
Idle speed control
system:
Inspect whether the idle speed bypass bolt is screwed properly, generally screwed into 2
turns.
Fuel
supply
system:
Whether fuel pipe has leakage.
16.4.3.5 Symptom - Higher/lower idle speed (idle speed obviously inconsistent
with the target idle speed)
Higher idle
speed:
When water temperature is lower than 68
℃
, the system will increase the idle speed to
accelerate the heating process, which is normal. Besides, inspect the system as the
following steps,
Inspect whether the idle bypass hole is too big,
Whether valve clearance, especially exhaust valve clearance, is too large.
Lower idle
speed:
Check fuel level in fuel tank, fuel filter, fuel path pressure and nozzle,
Inspect whether the idle bypass hole is too small,
Inspect whether valve clearance is too small.
16.4.3.6 Symptom - Unstable idle speed with deceleration & shutdown
a)
Check valve clearance
b)
Check whether the idle speed bypass hole and throttle valve are dirty
16.4.3.7
故障现象
—
加速无力
Symptom - Incapability to speed up
a)
Whether the parameters are normal at idle speed and high idle speed;
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