1. General Information/Trouble Diagnosis
1-13
B. Engine run sluggish (Speed does not pick up, lack of power)
Check and adjustment
Fault condition
Probable causes
Try gradual acceleration
and check engine speed
Engine speed can be
increased.
Engine speed can not
be increased.
Check ignition timing
(Using ignition lamp)
Check cylinder
compression pressure
(using compression
pressure gauge)
Ignition timing correct
Incorrect ignition timing
Compression pressure
correct
No compression
pressure
Check if fuel injector is
clogged
No clogged
Clogged
Remove spark plug
Check if engine over heat
No foul or discoloration
Fouled and discoloration
No knock
Knock
1. Air cleaner clogged
2. Poor fuel supply
3. Lines in fuel tank evaporation system
clogged
4. Exhaust pipe clogged
5. Fuel injector clogged
1. Malfunction of ECU
2. Malfunction of AC alternator
1. Cylinder & piston ring worn out
2. Cylinder gasket leaked
3. Sand hole in compression parts
4. Valve deterioration
5. Seized piston ring
1. Replace fuel injector
1. Remove dirt
2. Incorrect spark plug heat range
1. Piston and cylinder worn out
2. Injector clogged
3. Poor fuel quality
4. Too much carbon deposited in
combustion chamber
5. Ignition timing too advanced
Normal
Engine overheat
Continually drive in
acceleration or high
speed
1. Too much carbon deposited in
combustion chamber
2. Malfunction of fuel injector
3. Poor fuel quality
4. Ignition timing too advanced
