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Thread: I Hate Gremlins

  1. #1
    Lord Dude 03Blazin_Burn's Avatar
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    I Hate Gremlins

    back story.....2 years ago I started working on my truck lowering, general mess with it. I notice thump from my exhaust when I turn off my truck. It was not big but was there. It had no codes ran good. Did the tune up, and sea foam. Yes, it still did it(and no I didn't think it would fix it).
    Over the 2 years I talked to friends, dad,factory and other mechanics. I got back all kinds of things it could be. The valve timing, valve(burnt, bent, not seated, and bleed off). Cat as well. It even did it at idle, sometimes.

    I'm going to stop here to see what people say.
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  2. #2
    Gotta Love Stepshavers Sonomaguy's Avatar
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    Exhaust clamp loose or broken motor mount and everything shifting when the torque of the motor stops?
    2003 Sonoma Ext Cab, ZQ8 suspension package. Billet antenna. TYC taillights. LoRider tonneau. Sylvania Silverstars. K & N FIPK.

  3. #3
    Registered User dragnblazer's Avatar
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    thats what i was gonna say. but i re read his post and he said thump. not a rattle or anything so i didnt post. but my guess is something is loose
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  4. #4
    Lord Dude 03Blazin_Burn's Avatar
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    ...next thing I did was change the cat. It seem the one thing that was in the exhaust and could build pressure to make a sound(when the truck was turned off.
    Nope, not it!.
    Then I thought egr. I did a search across the world for what an egr did and could it do the things it was doing to me. After a couple around and around the engine bay I still Didn't have a handle on what was going on. The sound doesn't like to play with others so to speak and not do the sound when i need it too.
    One day I remember to grab my creeper and jump under it for the sound. Thump it did it. It was louder than I thought it was. I grabbed the gremlin in a head lock took it down to the local shop. It turned out to be the sinkin' muffler, it wad a bad weld in it. I changed it out for a flowmaster 40. Not the sound I was looking for but hey.
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    Quote Originally Posted by Blazin Low View Post
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  5. #5
    Orlando AD Pres. ON-D-FLOOR's Avatar
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    so what youre saying is that after you turned your truck off, that split second that the muffler starts to cool down it would make that ''thump sound"? wow, that is weird.... but glad you found out what it was.....
    ON D FLOOR- the best way to be!!!:cool:

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