Symptom Related Diagnostic Procedures

Poor Low Speed Performance (Backfiring Or Hard Starting)
1. Distributor incorrectly installed.
2. Incorrect ignition timing.
3. Defective distributor or igniter (module).

Engine Stalls Or Misfires Occasionally
1. Defective high tension cable, cap, rotor and/or spark plug insulation.
2. Defective primary circuit (damaged cable and ignition coil or overheated coil).

Poor Acceleration, High Speed Performance, Insufficient Output & Engine Stalls During Acceleration
1. Incorrect spark plug heat range.
2. Incorrect spark plug gap.
3. Defective governor advance mechanism.
4. Defective vacuum advance mechanism.
5. Defective ignition coil.

Knocking
1. Incorrect fuel octane rating.
2. Incorrect spark plug heat range.
3. Defective advance mechanism.