Regular Starts But Idle Speed Is Not Steady After The Engine Heating - Chery A21 2005 Service Manual

CHERY·A21 SERVICE MANUAL

8. Regular starts but idle speed is not steady after the engine heating.

General failure component: 1), water in fuel; 2), coolant temperature sensor; 3), spark
plug; 4),throttle valve and idle by pass port; 5), air intake port; 6), idle speed regulator;
7), engine mechanical part.
General diagnosis flow:
No.
Check the air cleaner if it is jammed; check the air intake
1
Check spark plugs in every cylinder and observe its type
2
Disassemble the idle speed regulator and check the throttle
3 valve and idle speed by pass port if there is carbon
Pull off coolant temperature sensor joint and start the
4 engine; observe the engine if it is idle speed unsteady
Disassemble the injector, check the injector using the
5
injector special cleaning analysis meter and observe if it is
Check fuel conditions and check if the failure is appeared
6
Check pressure conditions of every cylinder and observe if
7
there is big pressure difference between the cylinders.
Connect EFI system adaptor, turn on the ignition switch;
check the power supply of pin No.12, 13, 44, 45 and No.63
8
if it is in right conditions; check pin armature of No.3, 51,
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Operating steps
port if it is leaking.
and clearance if it is accord with the regulation.
deposition
during warming up the engine.
leaking or jammed or overflowing.
just after the fuel refilling
53, 61 and No.80 if it is in right conditions.
60
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ENGINE EFI SYSTEM
Result Follow up steps
Repair the air
Yes
intake system
No Next step
Yes Next step
Adjust or
No
replace
Cleaning the
Yes
related parts
No Next step
Repair the line
Yes or replace
sensor
No Next step
Yes Replace part
No Next step
Yes Change fuel
No Next step
Yes Trouble shoot
No Next step
Yes Diagnosis help
Repair the
No corresponding
line