5. With normal rotation speed, difficult to start at any time
Common trouble location:
1. Fuel with water; 2. Fuel pump; 3. Coolant temperature sensor;
4. Fuel injector; 5. Ignition coil; 6. Throttle body and idle speed by-pass air way;
7. Intake air way; 8. Ignition timing; 9. Spark plug. 10: Mechanical part of the engine.
Diagnosis Flow
Table 1-71
S/N Operation Test Results Actions
Yes
Check and repair air
intake system
1
Check the air filter for blockage and the intake air way
for leakage.
No Next step
Yes Next step
2
Connect the fuel pressure gauge (the connection
point is the front end of the intake pipe of the fuel
distribution pipe assembly), and start the engine.
Check if the fuel pressure of the engine under full
working condition is about 350kPa.
No
Check and repair fuel
supply system
Yes Next step
3
Draw out the wire of one of the cylinders, and connect
with the spark plug. Keep the electrode of the spark
plug about 5mm from the engine body. Start the
engine, and and check if the blue white high voltage
fire is produced.
No
Check and repair ignition
system
Yes Next step
4
park plug for each cylinder. Check if its model and gap
can meet with starndards.
No Adjust or replace
Yes Replace sensor
5
Disconnect the coolant temperature sensor, and start
the engine. Is it OK?
No Next step
Yes
Wash throttle and idle
speed air way
6
Gently step on the accelerator. Does it can be started
easily?
No Next step
Yes Remove the trouble
7
Remove the fuel injector. Check the fuel injector for
leakage or blockage with a special fuel injector
cleaner & analyzer.
No Next step
Yes Replace fuel
8 Check the fuel for normal operation.
No Next step
Yes
Remove the mechanical
troubles for the engine
9
Check the pressure of each cylinder of the engine.
Check if the pressure is enough.
No Next step
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