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My engine has developed a high pitch squeal, it seems to be coming from the top front area right in front of the intake manifold. Any ideas what it might be?
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Bad belt?

Bad idler or tensioner pulley bearings?

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thought it was coming fromthe idler pulley, replaced it, still squeals.


If I goose the throttle it will stop momentarily, if I increase engine speed slowly, the squeal doesn't change in pitch.


Thanks for the reply.
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Might possibly be a vacuum leak whistling.