Thread: Hissing Noise On A 1999 Pontiac Grand Prix

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  1. #1 Hissing Noise On A 1999 Pontiac Grand Prix 
    GrandPrixChic
    GrandPrixChic is offline
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    Question 12-23-2010
    Hello Everyone,

    I have a 1999 Pontiac Grand Prix GT. V6. 3.8L. I have started hearing a irritating hissing noise coming from underneath the car somewhere. This is when the car is sitting still as well as driving it. Also when I am driving and hit the gas it makes a loud noise as well. I don't know if it's the muffler that need to be replaced. I am looking for some answers. If there is someone out there that can help me it would be greatly appreciated.


    I went out side and checked the hissing noise seems to be coming from the rear
    Last edited by GrandPrixChic; 12-23-2010 at 07:45 PM.
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