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Help me figure out this noise before my engine goes boom!

This is a discussion on Help me figure out this noise before my engine goes boom! within the General Help forums, part of the LSx Technical Help Section category; http://youtube.com/watch?v=IGgnHGLucng It started doing this last night, its coming from the front area/upper exhaust/possibly lifter area. Only makes the noise ...

  1. #1
    Junior Member CurrentlyPissed's Avatar
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    Help me figure out this noise before my engine goes boom!

    http://youtube.com/watch?v=IGgnHGLucng

    It started doing this last night, its coming from the front area/upper exhaust/possibly lifter area. Only makes the noise on a decline in revs, cruising and idling it doesn't make the noise, but does if I get on it.

    Noticed mosture in the oil after checking the cap, but I see this all the time with winter season, so doesn't really have me worried with a headgasket or anything, antifreeze is full, oil looked decent. Flushed the oil, and changed it, noise is still there.

    Any ideas?
    _________________

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    Member ultra_badass's Avatar
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    navy blue matallic
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    what ever it is....it doesnt sound good maybe a valve lol i dont know

  3. #3
    Impounded
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    odd noise for sure...take more of it and maybe someone can pick it out.

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    CrapMaster samson_420's Avatar
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    I have no idea, maybe a exhaust leak by the flange.

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    Senior Member Sleeper101's Avatar
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    Moister in the oil as in it has a white tint to it?

    You possibly have blew a head gasket and its blowing compression out between the head and the block causing the noise...

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    Senior Member bigrondownhiller's Avatar
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    never heard a sound like that from an engine.

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    N/A nitrously aspirated stangslayer98's Avatar
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    black
    1998 trans am

    sounds like a wet fart

  8. #8
    CrapMaster samson_420's Avatar
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    Quote Originally Posted by stangslayer98 View Post
    sounds like a wet fart

    That about covers it. . . . . .

    Or maybe a engine Quif? ? ? ? ? ?

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    Veteran 0rion's Avatar
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    never heard that one either. Was the oil chocolate looking at all? I suppose it could be a head gasket although I've never heard one do that. I would rule out the exhaust first. You can't narrow it down closer to an area such as a cylinder? My gut would tell me it's exhaust so I would work on that first. Check around the manifold really well and the air tubes. Make sure all gaskets are good and that a manifold isn't cracked. Look at the base of the air tube for cracks.

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    Junior Member CurrentlyPissed's Avatar
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    Quote Originally Posted by 0rion View Post
    never heard that one either. Was the oil chocolate looking at all? I suppose it could be a head gasket although I've never heard one do that. I would rule out the exhaust first. You can't narrow it down closer to an area such as a cylinder? My gut would tell me it's exhaust so I would work on that first. Check around the manifold really well and the air tubes. Make sure all gaskets are good and that a manifold isn't cracked. Look at the base of the air tube for cracks.
    I guess some info about the car would help. First off the oil was that normal yellowish look when water gets to it, typical in the winter on dodges so that doesn't really concern me.

    As for the car, it has paceseeter LTs, ory, cat-back, lid, and tune. So I'm imagining a header bolt backed out or something, gonna snug them all back up tommorow, and will report back then.

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    sounds like exhaust leaking from the a.i.r. system possibly a check valve burnt out then burnt through a hose

  12. #12
    Junior Member CurrentlyPissed's Avatar
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    Quote Originally Posted by newtechnova View Post
    sounds like exhaust leaking from the a.i.r. system possibly a check valve burnt out then burnt through a hose
    You know, a bolt did rattle out after the headers like 3 days after, but it never made a noise. Maybe its finnaly leaking, I'll have to check that. Would that possibly cause a lean code aswell? I tossed one last night somehow, but after erasing, it hasn't come back up.

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    Life in the Fast lane sunsetorangess's Avatar
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    Which header gaskets are you using? Sounds almost like a leak, although it is a different sound.
    J
    2001 SS, Its not the car its the Driver that matters....

  14. #14
    Veteran 0rion's Avatar
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    a leak in the exhaust prior to a front O2 would make it show lean. Was it the same side? what code was it?

  15. #15
    The Bandit Wesman's Avatar
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    It almost sounds like a bad pulley to me. You can try taking the belt off and start the car, you'll know right away of thats the culprit.

  16. #16
    Junior Member CurrentlyPissed's Avatar
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    Quote Originally Posted by 0rion View Post
    a leak in the exhaust prior to a front O2 would make it show lean. Was it the same side? what code was it?
    It was lean on banks 1 and 2. Only way I could think an exhaust leak would lean out both banks at teh same time would be through A.I.R.

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    Senior Member Sleeper101's Avatar
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    Have you found the problem yet?

  18. #18
    I have a need for speed! jigger1166's Avatar
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    Quote Originally Posted by CurrentlyPissed View Post
    You know, a bolt did rattle out after the headers like 3 days after, but it never made a noise. Maybe its finnaly leaking, I'll have to check that. Would that possibly cause a lean code aswell? I tossed one last night somehow, but after erasing, it hasn't come back up.
    If a bolt backed-out, it prob. started burning the gasket, and now the gasket's starting to leak. If that's what it is, it'll get worse, and you'll know for sure.

  19. #19
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    when you find out what it is let me know because mine does the same noise on a decline of revs and it started 2 days ago right after i changed my oil

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