Detonation, Spark Knock

Definition: A mild to severe ping, usually worse under acceleration. It sounds like popcorn popping.

Check for overheating problems:
^ Low coolant
^ Loose drive belt
^ Restricted air flow through radiator, or restricted air flow through condenser (if A/C equipped).
^ Proper cooling fan operation
^ Front air dam missing or damaged.

Check:
^ Knock sensor circuit system for no spark retard, during the knock condition
^ TCC operation
^ EGR operation

Remove carbon with top engine cleaner:
^ Check for poor fuel quality, proper octane rating.

Fuel with higher octane ratings can eliminate problem.