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Discussion Starter · #1 ·
Hello all,

I have a 2004 Envoy with about 150,000 miles and it is making this knocking noise from the engine. I have taken the belt off and none of the pulleys are bad. It has been making the noise for years now and it doesn't effect how the truck drives. below is a video of the noise.

 

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Listen in the oil cap and under the vehicle. The noise is too metallic to tell with just this one sample.
 
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