Sound Of Air Sputtering On Underside Of Car Towards Exhaust Manifold Area.

Discussion in 'SN95 4.6L Mustang Tech' started by sstewart326, Mar 5, 2014.

  1. sstewart326

    sstewart326 New Member

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    2000 gt

    I recently noticed the sound of air coming from the underside of the stang towards the engine bay. I haven't jacked her up yet so I cannot pinpoint where the sound is coming from. When I'm just driving the car, the sound is not evident. I only hear it if my windows or door is open and the car is idling. It would be tough to hear when reving or driving because the exhaust masks the sound. Mechanically, the car is running great. I had one of my friends plug my exhaust while I listened and the sound did not change; it remained constant. The sound that I'm hearing almost sounds like a steam train (just not as intense).

    I have had a manifold leak on my old v6 mustang, and this does not sound like my v6 sounded. For one, the sound of the leak on the v6 would go away once the car warmed up. On my gt, the sound remains even when the car is at operating temperature. Plus, it's less of a clicking noise and more of a sputtering air kind of noise.
     
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  2. sstewart326

    sstewart326 New Member

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    so I went on this site http://www.popularmechanics.com/cars/how-to/repair/1833626 and my problem sounds exactly like this :

    noise: FFFFffff ttttFFFF ffff ttttFFFFffff tttt
    WHERE: Under the hood.
    WHEN: Most noticeable at idle.
    WHAT: An exhaust manifold gasket has failed, venting hot exhaust gases to the air.
    URGENCY: It's not getting better on its own. The blowtorch of corrosive gases will eventually damage the manifold. Oh, by the way: Carbon monoxide from the leak may make you drowsy or dead.
    FIX: Replace the exhaust manifold gasket before the leak eats a hole in the manifold.


    Anyone have there exhaust manifold gasket go bad on them?
     
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  3. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor
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    I don't understand the purpose of this thread.

    If you know that the exhaust manifold gasket is leaking then change it. :shrug:
     
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  4. sstewart326

    sstewart326 New Member

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    well when i started the thread i had no idea what was wrong with it
     
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  5. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor
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    Might be a great time to upgrade to long tube headers. :nice:
     
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  6. madspeed

    madspeed Colonel Mustard
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    And that leads to mid pipe, and then why upgrade those without doing the catback... There goes a grand to fix a $20 gasket :cool:
     
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  7. sstewart326

    sstewart326 New Member

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    I was thinking the same thing. Now I have an excuse (sort of) to put on some headers. But I need to pass emissions, and correct me if I'm wrong, but I thought long tube headers will not pass emissions. Which comes to another question: are shortys worth it? Right now I just have an H-pipe with some flowmasters
     
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  8. madspeed

    madspeed Colonel Mustard
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    Never heard that at least around here
     
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  9. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor
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    What state and county are you in?
     
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  10. sstewart326

    sstewart326 New Member

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    Gwinnett County Ga right outside of Atlanta
     
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  11. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor
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    Your catalytic converters will have to be mounted in the stock locations. You will be required to have the factory number of converters (even though 3-way are more efficient).

    What it all means is that long tubes could be pretty expensive for you. I'd toss on some shorties and put the rest of the cash toward a blower.
     
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