Suzuki Intruder VZR1800 Service Manual page 481

Complaint
Engine lacks power. Defective engine internal/electrical parts
Symptom and possible causes
1. Loss of tappet clearance
2. Weakened valve springs
3. Valve timing out of adjustment
4. Worn piston rings or cylinders
5. Poor seating of valves
6. Fouled spark plugs
7. Incorrect spark plugs
8. Clogged fuel injectors
9. TP sensor out of adjustment
10. Clogged air cleaner element
11. Imbalancing throttle valve synchronization
12. Sucking air from throttle valve or vacuum hose
13. Too much engine oil
14. Defective fuel pump or ECM
15. Defective CKP sensor and ignition coils
Defective control circuit or sensor
1. Low fuel pressure
2. Defective TP sensor
3. Defective IAT sensor
4. Defective CKP sensor
5. Defective GP sensor
6. Defective IAP sensor
7. Defective ECM
8. Defective ISC valve
9. TP sensor out of adjustment
10. Imbalanced throttle valve synchronization
11. Defective STP sensor and/or STVA
12. Defective EXCVA
SERVICING INFORMATION
Remedy
Adjust.
Replace.
Adjust.
Replace.
Repair.
Clean or replace.
Adjust or replace.
Replace.
Adjust.
Replace.
Adjust.
Retighten or replace.
Drain out excess oil.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Adjust.
Replace.
Replace.
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