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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: jumpkickyergunt on December 19, 2014, 05:04:00 pm
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Sounds like it's coming from behind the engine. It's not there when under acceleration, but shows up at low rpm or idle. I can hear it in drive, neutral, and park. Sometimes it's there, sometimes not. Also, only when the engine is warmed up like if I come off the highway I can hear it when I slow down on the off ramp. 79 k10, 350. I can probably get a video with sound posted up if necessary.
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Mine was doing that a little bit to and it turned out to be loose exhaust hangers and the exhaust was just vibrating around making a awful noise
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it could be the little flapper inside the passenger exhaust for the heat riser