2000 Chevy Impala noise in the engine

2000 CHEVROLET IMPALA
90,000 MILES • 6 CYL • 2WD • AUTOMATIC
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JESUSSILVA
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my engine iis making a weird noise: is coming from the center of the engine, its making like a screching sound.
i alredy tried checked the pcv valve and the puleys, but thats no it, but when i took off the engine oil cap, the noise stopped, and when i put it back on its still making the noise. i dont know if it has something to do with air vaccumming from someplace or something else is wrong.

somebody who will help me, i will apreciated a lot..:)
Feb 16, 2010 at 3:48 PM
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BASSTECH
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did you replace the PCV or just look at it ?
Feb 17, 2010 at 3:52 AM
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JESUSSILVA
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well i just looked at it, but i also checked the PCV valve and it looks in good conditions, not so old
Feb 18, 2010 at 3:20 PM
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BASSTECH
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with out hearing the noise myself, I can only conclude that you have some type of a vacuum leak, possibly in the lower intake manifold. Does the noise change as you rev the egine a bit? Is the check engine light on all ? Have you noticed a change in fuel mileage?
Feb 19, 2010 at 12:48 AM
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JESUSSILVA
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i agree with you; its some sort of vacuum leak, but no idea where to start :S when you rev the engine the noise does change, it doesnt sound much, also the check engine light is on and the mileage did change, it whent from like 15mpg to 12 1/2

im stuck :(
,but it is vacuuming more than its supost to
Feb 20, 2010 at 2:13 PM
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