9. With normal start, unstable idle speed or flameout under partial load (with A/C on, etc)
Common trouble location:
1. A/C system; 2. Idle speed regulator; 3. Fuel injector
Diagnosis Flow
Table 1-75
S/N Operation Test Results Actions
Yes Adjust
1
Check if the accelerator cable is locked or over
tightened.
No Next step
Yes
Check and repair air
intake system
2
Check the air intake system and the connected
vacuum pipe for leakage.
No Next step
Yes Wash relevant parts
3
Remove the idle speed regulator. Check the throttle
body, idle speed regulator, and idle speed by-pass
air way for carbon deposition.
No Next step
Yes Replace sensor
4
Disconnect the coolant temperature sensor and
start the engine. Check the idle speed of the
engine. Is it too fast?
No Next step
Yes Next step
5
Check if the ignition timing of the engine can meet
with standards.
No
Check and repair ignition
timing
Yes Diagnosis help
6
Connect the electronic injection system adapter.
Turn on the ignition switch. Check the power supply
of the pin 12#, 13#, 44#, 45#, 63#. Check the
grounding of the pin 3#, 51#, 53#, 61#, 80#. Are
they OK?
No
Check and repair relevant
line
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