Noise while accelerating


Old 03-15-07, 08:43 AM
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Noise while accelerating

I have a 1999 Mercury Mountaineer, 5.0 L, V8. When I accelerate I hear a hissing/light rattling noise coming from underneath where the accelerator is. It doesn't affect performance, but I hear it every time I accelerate and it goes away when I am coasting. Any ideas?
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Old 03-15-07, 03:10 PM
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Sounds like an axhaust leak or vacuum line leak. Inspect your exhaust system to include the exhaust manifolds coming off the engine.

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