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.
Refer to COMPUTERIZED ENGINE CONTROLS.


Poor or contaminated fuel Check for excessive alcohol content.

Recommend higher grade fuel.


Incorrect fuel pressure Check fuel pressure


Vacuum leak Inspect vacuum hoses for proper routing and damaged lines.

Check intake manifold and throttle body.