Engine - Suzuki VZ800 Service Manual

ENGINE

Complaint
Engine will not start
or is hard to start.
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
Plug not sparking
1. Fouled spark plugs
2. Wet spark plugs
3. Defective ignition coil
4. Defective CKP sensor
5. Defective ECM
6. Open-circuited wiring connections
7. Open or short in high-tension cords
No fuel reaching the 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 TP sensor
2. Defective fuel pump
3. Defective fuel pressure regulator
4. Defective TP sensor
5. Defective CKP sensor
6. Defective IAP sensor
7. Defective ECM
8. Defective ECT sensor
9. Defective IAT sensor
SERVICING INFORMATION 10-5
Remedy
Adjust.
Repair or replace.
Adjust.
Replace.
Replace.
See electrical section.
Retighten.
Clean.
Clean and dry.
Replace.
Replace.
Replace.
Repair or Replace.
Replace.
Clean or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Check and repair.
Adjust.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.