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Discussion Starter #1
Hi! Its me again. This time I would like to ask what is the problem with my engine because when it is idle the engine sound is smooth, then when I rev it up there is a squeaking noise. What may cause such noise?
 

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I've never heard bearings squeak, they usually make a roaring noise. I'd try tightening up the belt, usually you adjust the alternator bracket to tighten it.
 

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check the belts visually and for proper tension, if they appear ok, have someone rev the engine to the point where it normally squels and than spray a small bit of water on the belt, if the noise goes away the belt is bad
 

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Discussion Starter #6
Hi there guys!

We found out that the noise is coming from the A/C belt. The mechanic tried to put some water and the noise goes away.

Thanks again!
 
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