Detonation - Pings, Spark Knock

A mild to severe ping, usually worse under load or acceleration. Sounds like something is rattling or knocking in the engine.

POSSIBLE CAUSE ACTION




Spark timing not retarding - Check Spark Controls,


Lean Air-Fuel mixture - Check Air-Fuel ratio, O2 sensor, perform injector balance test, inspect regulator operation (check vacuum line and return hose), check fuel pressure


Poor or contaminated fuel - Recommend higher grade fuel