For 1990-2009 cars

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

• | Proper cooling fan(s) operation

• | Front air dam missing or damaged

Check:

• | Knock sensor circuit system for no spark retard, during the knock condition

• | TCC operation (automatic transaxle only)

Remove carbon with top engine cleaner:

• | Check to see if engine is running lean (monitor long term fuel trim for significant positive values). Refer to P0171.

• | Check for poor fuel quality, proper octane rating

Fuel with higher octane ratings may eliminate problem