Suzuki GSX1400 Service Manual page 310

Complaint
Engine idles poorly.
Engine stalls easily.
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Symptom and possible causes
1. Out of adjustment valve clearance.
2. Poor seating of valves.
3. Defective valve guides.
4. Worn down camshaft.
5. Too wide spark plug gaps.
6. Defective ignition coil or plug cap.
7. Defective crankshaft position sensor.
8. Defective ECM.
9. Defective throttle position sensor.
10. Defective fuel pump.
11. Imbalanced throttle valve.
12. Damaged or cracked vacuum hose.
Incorrect fuel/air mixture
1. Defective intake air pressure sensor or circuit.
2. Clogged fuel filter.
3. Defective fuel pump.
4. Defective fuel pressure regulator.
5. Defective engine oil temp. sensor.
6. Defective intake air temp. sensor.
Improperly working fuel injector
1. Defective fuel injector.
2. No injection signal from ECM.
3. Open or short circuited wiring connection.
4. Defective battery or low battery voltage.
Improperly working control circuit or sensors
1. Defective ECM.
2. Defective fuel pressure regulator.
3. Defective throttle position sensor.
4. Defective intake air temp. sensor.
5. Defective camshaft position sensor.
6. Defective crankshaft position sensor.
7. Defective engine oil temp. sensor.
8. Defective fuel pump relay.
Improperly working engine internal parts
1. Fouled spark plugs.
2. Defective crankshaft position sensor or ECM.
3. Clogged fuel hose.
4. Out of adjustment tappet clearance.
SERVICING INFORMATION 8-5
Remedy
Adjust.
Replace or repair.
Replace.
Replace.
Adjust or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.
Repair or replace.
Clean or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Repair or replace.
Replace or recharge.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Clean.
Replace.
Clean.
Adjust.