Normal Engine Speed But Hard To Start At Any Time - Chery A21 2005 Service Manual

CHERY·A21 SERVICE MANUAL

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