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Pontiac Master
21,873 Answers
- Posted on Aug 17, 2012
Re: what does the engine sound like when the map sensor...
The map sensor measures vacuum in the intake manifold, so a faulty sensor would not make a noise. The engine would run lean or rich and the check engine light would be on.
A squealing engine is usually a problem with the serpentine belt or one of the accessories the belt drives.
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