S10 2.2 lifter noise?


I had previously posted last year on the problems i had with my 96 2.2 Chevy S10. To recap, the tensioner on the cam chain broke and allowed the chain to jump time. I took the head off and found
8 bent valves. I had the head into a machine shop, had it cleaned, decked, and 8 new valves and seals put in it. I had someone else put the head back on at the time. The truck started and ran OK after all this.

Now, here's my issue. At About 3000 RPM+ or so i hear what appears to be lifter noise from the engine. I cannot really detect it at lower RPM's. And i can raise the throttle in park to this point and hear the noise also.

So, my question now is what this noise could be? I did not remember hearing it before all this happened. My thoughts are maybe: A lifter mount not properly screwed down? Bent push rods maybe? I know this engine had piston slap issues and i heard them before this happened. But it really does not seem to be the same noise. Any thoughts? What would be the result of a bent push rod?

Bob

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Next time the tank is low, fill it with premium. It might be spark knock.

Al






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Get a mech to listen & check for rod-bearing noise. s




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sdlomi2 wrote:



Its coming from the top end. I know what pre detonation noise is and its not that. And its peaky like a resonance only above a certain RPM. It almost sounds like something loose sympathetically vibrating, but i a fairly sure its somehow valve train related. Ir does not have that lower sound of lower end rod/bearing noise.

Back to the original questions: If the push rods were slightly bent, what kinds of symptoms or noise If the rocker arm nuts were slightly loose?

Bob

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I think if any of these conditions exist, there would be valve lifter noise, and it seems as if it would be loudest when oil pressure was lowest--at idle? Don't believe it'd be loudest at 3k rpm, as oil pressure should be relatively high there. s




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