S5 Workshop Manual Engine
Fault Diagnosis
Engine is Difficult to Start:
Fault Phenomenon and Reason
The starter
doesn't rotate
1. Battery doesn't rotate.
2. Electric circuit is broken.
1. Ignition timing is incorrect.
3. Bad ground wire connection
4. Spark plug has improper clearance or burned out.
5. Electric ignition system has fault.
1. Gasoline pump supplies insufficient oil.
2. Gasoline hose and gasoline filter are blocked.
Cylinder
compression
pressure
reduce
1. Cylinder cushion has crack.
2. Valve clearance is improperly adjusted or damaged.
Adjust, repair or
replace
3. Intake manifold is loose, or there is air flowing into it.
4. Piston, piston ring, cylinder worn
Power is Insufficient during Running:
Fault Phenomenon and Reason
Power is
insufficient
during
running
Accelerator pedal and throttle body
are improperly adjusted.
Cylinder compression pressure
reduce
1. Inspect whether valve, spark plug,
cylinder cushion have leakage;
2 cylinder grinding
Ignition timing is not correct
Check air exhaust system and clear carbon
deposition
Spark plug clearance is improper or
damage
Knock Cylinder Sound in the Engine:
Fault Phenomenon and Reason
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