For 1990-2009 cars

Checks | Actions
--- | ---
DEFINITION: A mild to severe ping, usually worse under acceleration. It sounds like popcorn popping.

• | 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 for overheating problems.

Knock Sensor Circuit System | Check knock sensor circuit system for no spark retard during the knock condition
Torque Converter Clutch (TCC) | Check TCC operation (A/T only).
Exhaust Gas Recirculation (EGR) | Check EGR operation.
Fuel |

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

Fuel with higher octane ratings may eliminate the problem.