Engine - Suzuki GSX1400 Service Manual

8-4 SERVICING INFORMATION

ENGINE

Complaint
Engine will not start,
or is hard to start.
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Symptom and possible causes
Compression too low
1. Out of adjustment valve clearance.
2. Worn valve guides or poor seating of valves.
3. Mistiming valves.
4. Excessively worn piston rings.
5. Worn-down cylinder bores.
6. Too slowly starter motor cranks.
7. Poor seating of spark plugs.
Plugs not sparking
1. Fouled spark plugs.
2. Wet spark plugs.
3. Defective ignition coil or plug cap.
4. Defective CKP sensor.
5. Defective ECM.
6. Open-circuited wiring connections.
No fuel reaching intake manifold
1. Clogged fuel filter or fuel hose.
2. Defective fuel pump.
3. Defective fuel pressure regulator.
4. Defective fuel injector.
5. Defective fuel pump relay.
6. Defective ECM.
7. Open-circuited wiring connections.
Incorrect fuel/air mixture
1. Out of adjustment throttle position sensor.
2. Defective fuel pump.
3. Defective fuel pressure regulator.
4. Defective throttle position sensor.
5. Defective crankshaft position sensor.
6. Defective intake air pressure sensor.
7. Defective atmospheric pressure sensor.
8. Defective ECM.
9. Defective engine oil temp. sensor.
10. Defective intake air temp. sensor.
Remedy
Adjust.
Repair or replace.
Adjust.
Replace.
Replace.
See electrical section.
Retighten.
Clean.
Clean and dry.
Replace.
Replace.
Replace.
Repair or replace.
Clean or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Check and repair.
Adjust.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.