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I have a 99 6M vert with 157M miles. It has had relatively few problems but recently developed a rhythmic squeak from what sounds like the front of the engine. It is intermittent. No squeak at idle - ever - so far. The squeak begins ~1300 rpm and tracks the engine rpm from then on. It is a repeating sound - squeak - silent - squeak - silent, etc.
Once started, it continues with or without the A/C on.
Occasionally there is no squeak at all at any rpm.
It is pretty low volume. I can't hear it if the radio is on nor at highway speeds due to tire noise.
Sounds like a dry serpentine belt. With the engine off take a bar of soap and rub it on the grooved side of the belt in as many places that you can. Start the car and see if it quiets down. Don't use belt dressing, that makes them slip worse.
The grease in both idlers and both tensioners are drying up... These bearings run at high temps and speeds and need to be either replaced or they need to be removed cleaned and a special high speed, high temp silcone grease be applied.. do not use wheel bearing grease or any petro grease.
Last edited by Evil-Twin; Apr 10, 2008 at 12:40 PM.