Diagnosis By Symptom

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 cables, cap, rotor and/or spark plug insulator.
2. Defective primary circuit.
Poor Acceleration, High Speed Performance, Insufficient Output & Engine Stalls During Acceleration
1. Incorrect spark plug heat range value.
2. Incorrect spark plug gap.
3. Defective governor advance mechanism.
4. Defective vacuum advance mechanism.
5. Defective ignition coil.
Engine Knocks
1. Incorrect fuel octane rating (value).
2. Incorrect spark plug heat range value.
3. Defective advance mechanism.