Diagnostic Information And Procedures; Ignition System Symptom Diagnosis - Suzuki Intruder VZ1500 Service Manual

1H-2 Ignition System:

Ignition System Symptom Diagnosis

Condition
Spark plug not sparking
Engine stalls easily (No
spark)
Spark plug is wet or
quickly becomes fouled
with carbon
Spark plug quickly
becomes fouled with oil
or carbon
Spark plug electrodes
overheat or burn

Diagnostic Information and Procedures

Possible cause
Damaged spark plugs.
Fouled spark plugs.
Wet spark plugs.
Defective ignition coil/plug caps.
Defective ignition coils.
Defective CKP sensor.
Defective ECM.
Open-circuited wiring connections.
Open or short in high tension cord.
Fouled spark plugs.
Defective CKP sensor.
Defective ECM.
Excessively rich air/fuel mixture.
Excessively high idling speed.
Incorrect gasoline.
Dirty air cleaner element.
Incorrect spark plug (Cold type).
Worn piston rings.
Worn pistons.
Worn cylinders.
Excessive valve-stem to valve-guide
clearance.
Worn valve stem oil seals.
Incorrect spark plug.
Overheated engine.
Loose spark plugs.
Excessively lean air/fuel mixture.
Correction / Reference Item
Replace.
Clean or replace.
Clean and dry or replace.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Clean or replace.
Replace.
Replace.
Inspect FI system.
Inspect FI system.
Change.
Clean or replace.
Change to hot type spark plug.
Replace.
Replace.
Rebore or replace.
Replace.
Replace.
Change to cold type spark plug.
Tune-up.
Tighten.
Inspect FI system.
B940H21804001