Detonation/Spark-Knock/Pings

Definition: A mild to severe ping, usually worse under acceleration. The engine makes sharp metallic knocks that change with throttle opening.
POSSIBLE CAUSE ACTION
Lean operating condition Check computer controls.


Poor or contaminated fuel ^ Check for excessive alcohol content. Alcohol In Fuel Test
^ Recommend higher grade fuel

Incorrect fuel pressure Fuel System Diagnosis

Vacuum leak ^ Inspect vacuum hoses for proper routing and damaged lines
^ Check intake manifold, throttle body, etc.