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Olds 307 intermittent knocking/tapping sound

oliverd642

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Hi, I'm unsure where to post this so I will stick it here.

I have a 1990 caprice wagon with the olds 307 in it (I posted on chevy forums and got no response)

There is an intermittent tapping/knocking sound coming from the engine, mostly at idle speed to around 1500rpm, anything after that it goes away and comes back as the revs drop. Weird thing is, it doesnt do it all the time! sometimes its nice and quiet! I only usually hear it when the engine is warm. I am yet to hear it on a cold start.

Link to the sound:

Edit: I’ve just noticed, it’s not only when the engine is warm, sometimes it will make the sound when cold too.

Any ideas what it could be?
 
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307-5a

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Did you get this noise resolved yet ? my car make a noise like that when the AC is on . Does your car have AC
 
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