Thread: Hissing Noise On A 1999 Pontiac Grand Prix

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  1. #1 Hissing Noise On A 1999 Pontiac Grand Prix 
    GrandPrixChic
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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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  2. #2 Re: Hissing Noise On A 1999 Pontiac Grand Prix 
    FordMan77
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    Default 12-23-2010
    How is it running? Sounds like a vacuum leak to me. Start the car and get under the hood and see if you can narrow it down a bit.

    Jay
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  3. #3 Re: Hissing Noise On A 1999 Pontiac Grand Prix 
    GrandPrixChic
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    Default 12-23-2010
    Hello Jay,

    It's not underneath the hood it's in the rear of the car. When I press the gas when I am driving it makes a loud noise
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  4. #4 Re: Hissing Noise On A 1999 Pontiac Grand Prix 
    matt5112
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    Default 12-23-2010
    There can't be a hissing noise under the car unless you're leaking fuel.......
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  5. #5 Re: Hissing Noise On A 1999 Pontiac Grand Prix 
    GrandPrixChic
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    Default 12-23-2010
    It's not coming from underneath the hood, it's coming from the rear of the car. I don't know if it may be the exhaust or what.
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  6. #6 Re: Hissing Noise On A 1999 Pontiac Grand Prix 
    matt5112
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    Default 12-23-2010
    You need to take your car to a licensed automotive technician.
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  7. #7 Re: Hissing Noise On A 1999 Pontiac Grand Prix 
    FordMan77
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    Default 12-24-2010
    ^ THIS ^

    The only other thought is that the fuel pump is getting loud. Hopefully you don't have a fuel leak back there somewhere!
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  8. #8 Re: Hissing Noise On A 1999 Pontiac Grand Prix 
    gtpinsc
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    Default 12-24-2010
    back tire leaking air? lol

    02 GTP with mods 05 GP for DD
    Quote Originally Posted by SuperSport View Post
    The majority of the people here are potheads who want to buy good condition parts at junkyard prices.
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