Ignition System: 1H-2
Diagnostic Information and Procedures
Ignition System Symptom Diagnosis
B649G11804005
Condition Possible cause Correction / Reference Item
Spark plug not sparking Damaged spark plug. Replace.
Damaged spark plug cap. Replace.
Fouled spark plug. Clean or replace.
Wet spark plug. Clean and dry or replace.
Defective ignition coil. Replace.
Open or short in high-tension cord. Replace.
Defective CKP sensor. Replace.
Defective ignitor. Replace.
Engine stalls easily. (No
spark)
Fouled spark plug. Clean or replace.
Defective CKP sensor. Replace.
Defective ignitor. Replace.
Spark plug is wet or
quickly becomes fouled
with carbon.
Excessively rich air/fuel mixture. Adjust carburetor.
Excessively high idling speed. Adjust carburetor.
Incorrect gasoline. Change.
Dirty air cleaner element. Clean or replace.
Incorrect spark plug (Cold type). Change to hot type spark plug.
Spark plug quickly
becomes fouled with oil
or carbon.
Worn piston ring. Replace.
Worn piston. Replace.
Worn cylinder. Rebore or replace.
Excessive valve-stem to valve-guide
clearance.
Replace.
Worn valve stem oil seal. Replace.
Spark plug electrodes
overheat or burn.
Incorrect spark plug (Hot type). Change to cold type spark plug.
Overheated engine. Tune-up.
Loose spark plug. Tighten.
Excessively lean air/fuel mixture. Adjust carburetor.
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