Geely CK Series 2007 Workshop Manual page 80

7. Unstable idle or engine shut off at hot status
(1) Symptom
Idle speed is normal during the cold start and becomes unstable at hot status, idle speed is too
low or engine is shut off.
(2) Causes and Troubleshooting
a. Idle is adjusted too low, adjust it to normal condition;
b. Water temperature sensor fault, repair or replace it;
c. Poor injector operation or big injection variation, repair or replace it;
d. Poor water temperature switch and thermostat operation, repair or replace it;
e. Check valve is damaged and needs to be replaced.
Rough ildling, easy for engine shut off
Check whethe the air tightness of the intake system is good
OK
Check idle control valve for operation
Operative
Reset the initial idle speed
Check the spark plug
OK
Check the fuel pressure
OK
Check the injector
OK
Check the pressure sensor
OK
Check the cylinder compression pressure
OK
Check and adjust the valve clearance
Inoperative
Poor
Adjust the clearance or replace
NG
Check the electric pump, fuel
pressure regulator and fuel filter
NG
Replace
NG
Replace
NG
Figure 152
Poor
Troubleshooting
Disassemble or replace
Disassemble the engine
73