Diagnostic Information And Procedures; Ignition System Symptom Diagnosis - Suzuki RMX450Z Service Manual

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 plug cap.
Damaged spark plug.
Fouled spark plug.
Wet spark plug.
Defective ignition coil.
Defective CKP sensor.
Defective ECM.
Open-circuited wiring connections.
Open or short in high-tension cord.
Defective ignition coil.
Fouled spark plug.
Defective CKP sensor.
Defective ECM.
Open-circuited wiring connections.
Excessively rich air/fuel mixture.
Excessively high idling speed.
Incorrect gasoline.
Dirty air cleaner element.
Incorrect spark plug. (Cold type)
Worn piston rings.
Worn piston.
Worn cylinder.
Excessive valve stem to valve guide
clearance.
Worn valve stem oil seals.
Incorrect spark plug.
Overheated engine.
Loose spark plug.
Excessively lean air/fuel mixture.
Ignition System:
Correction / Reference Item
Replace.
Replace.
Clean or replace.
Clean and dry or replace.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Clean or replace.
Replace.
Replace.
Repair or replace.
Inspect FI system.
Inspect FI system.
Change.
Clean or replace.
Change to standard spark plug.
Replace.
Replace.
Replace.
Replace.
Replace.
Change to cold type spark plug.
Tune-up.
Tighten.
Inspect FI system.
1H-2
BA02J21804001