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Chery QQ Service Manual Page 61

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
61
5. Normal engine speed but hard to start at any time.
General failure component: 1), water in fuel; 2), fuel pump; 3), coolant temperature
sensor; 4), injector; 5), ignition coil; 6), throttle valve and idle speed by pass port; 7), air
intake port; 8), ignition timing; 9), spark plug; 10), engine mechanical part.
General diagnosis flow:
No. Operating steps Result Follow up steps
Yes
Repair the air
intake system
1
Check the air cleaner if it is jammed; check the air
intake port if it is leaking.
No Next step
Yes Next step
2
Connect the fuel pressure meter ( connecting point is
the front end of fuel distributing pipe assembly fuel
intake pipe); start the engine and check fuel pressure
at idle speed if it is around 260kpa; take off the
vacuum pipe from fuel pressure regulator check the
fuel pressure if it is around 300kpa.
No
Repair the fuel
supplying system
Yes Next step
3
Pull off one of the cylinder separating line and connect
spark plug to it; keep the spark electrode around 5mm
away from engine body; start the engine and check if
there is blue and white high pressure fire.
No
Check and repair
ignition system
Yes Next step
4
Check spark plugs in every cylinder and observe its
type and clearance if it is accord with the regulation.
No Adjust or replace
Yes
Repair circuit or
replace sensor5
Take off the coolant temperature sensor joint and start
the engine; observe if the engine can be started
successfully.
No Next step
Yes
Clean throttle
valve and idle
speed air port
6
Step on the accelerator slightly and observe if it is
easy to be started easily.
No Next step
Yes Replace the part
7
Disassemble the injector, check the injector using the
injector special cleaning analysis meter and observe if
it is leaking or jammed.
No Next step
Yes Change fuel
8
Check fuel conditions and check if the failure is
appeared after the fuel refilling
No Next step
Yes Trouble shoot
9
Check pressure conditions of every cylinder and
observe if there is insufficient pressure
No Next step
Yes Next step
10
Check the engine ignition order and ignition timing if
it is accord with the regulation.
No
Repair the
ignition timing
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