Repair Safety Notice:
This information is for general instructional purposes only. Vehicle repair can be dangerous.
Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
and consult a qualified repair shop when needed.
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DRCRANKNWRENCH
AUTOMOTIVE REPAIR CONTRIBUTOR
3,380 POSTS
Listen for the location of the noise with the engine running and the hood open. You may need someone to help if it needs to be in gear to hear the knocking.
You could have bad gas or need a higher octane or have an engine knock from the top end or bottom end.