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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | Joined: Sep 2008 Posts: 872 Shop Shark | | Shop Shark Joined: Sep 2008 Posts: 872 | Is it RPM dependent? At idle only or worse at speed?
Do you have a mechanics stethoscope (harbor freight sells an OK one for a few bucks). That can help narrow it down to a cylinder/top/bottom end.
To help locate it I would remove the fuel pump and the fan belt.. anything external to the engine that makes noise and run the motor using the stethoscope and listen to the motor in a systematic way... the closer you get to the noise the louder it will be. Its a fairly helpful tool.
You've already rules out valve lash and done a compression test?
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