S5 Workshop Manual
Engine
EM-62
Fault Diagnosis
Engine is Difficult to Start:
Fault Phenomenon and Reason
Troubleshooting
The starter
doesn't rotate
1. Battery doesn't rotate.
Tightening or
charging
2. Electric circuit is broken.
Inspection and repair
3. Starter has damage.
Repair or replace
Spark plug
misfire
1. Ignition timing is incorrect.
Adjust
2. Ignition coil damaged
Replace
3. Bad ground wire connection
Repair
4. Spark plug has improper clearance or burned out.
Adjust or replace
5. Electric ignition system has fault.
Repair or replace
Oil supply
system fault
1. Gasoline pump supplies insufficient oil.
Repair or replace
2. Gasoline hose and gasoline filter are blocked.
Clean
Cylinder
compression
pressure
reduce
1. Cylinder cushion has crack.
Replace
2. Valve clearance is improperly adjusted or damaged.
Adjust, repair or
replace
3. Intake manifold is loose, or there is air flowing into it.
Tightening
4. Piston, piston ring, cylinder worn
Repair or replace
Power is Insufficient during Running:
Fault Phenomenon and Reason
Troubleshooting
Power is
insufficient
during
running
Accelerator pedal and throttle body
are improperly adjusted.
Adjust
Cylinder compression pressure
reduce
1.
Inspect whether valve, spark plug,
cylinder cushion have leakage;
2 cylinder grinding
Ignition timing is not correct
Adjust
Gas supply insufficient
Adjust or replace
Air intake insufficient
Inspect intake system
Air exhaust block
Check air exhaust system and clear carbon
deposition
Spark plug clearance is improper or
damage
Adjust or replace
Knock Cylinder Sound in the Engine:
Fault Phenomenon and Reason
Troubleshooting
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