Thread: Engine noise while accelerating

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  1. #1 Engine noise while accelerating 
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    Hello Everyone,

    I have been hearing an engine noise while accelerating lately.

    When pushing it at or above 3k rpms I hear a “nun-nun-nun-nun-nun” rhythm over the normal engine acceleration. I don’t remember hearing this in the past. Does anyone have any experience with this sort of noise or do you think I should have it checked out?

    2004 Grand Prix
    3.8L V6 (non-super charged)
    110k miles
    Plugs and wires changed a couple years back

    Thank you!
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  2. #2 Re: Engine noise while accelerating 
    Killa Bee Scottydoggs's Avatar
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    gonna have to post a vix of said noises. that discription just wont do. lol

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: Engine noise while accelerating 
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    You mean my scientific description of “nun-nun-nun-nun-nun” isn't good enough haha

    I will report back with a video if I can get some good sound quality.
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  4. #4 Re: Engine noise while accelerating 
    Killa Bee Scottydoggs's Avatar
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    Caddyshack - "Na-Na-Na-Na-Na Putting Scene" - (HD) Scenes from the 80s (1980) - YouTube this part of caddy shack is all that came to mind at first lol

    it could be a bad tire too. not knowing how old or worn yours are.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #5 Re: Engine noise while accelerating 
    Turbo is the way to go. BillBoost37's Avatar
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    yeah..I'm also in the .. dunno what nun nun nun is ..unless you are in church?
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  6. #6 Re: Engine noise while accelerating 
    The Boss Iceman6669's Avatar
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    Quote Originally Posted by BillBoost37 View Post
    yeah..I'm also in the .. dunno what nun nun nun is ..unless you are in church?
    Oh come on Bill...

    we we used to play STUMP BILLBOOST all the time... if anyone can diagnose an issue based on obscure generic noise references, it’s you!
    97 GTP Sold-prolly rusted away by now
    2011 F-150 Yote powered
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  7. #7 Re: Engine noise while accelerating 
    Turbo is the way to go. BillBoost37's Avatar
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    Actually.. I am sitting here talking to wife and mentioned this noise that was mentioned. I think I know it.

    What rpm are you seeing when you are hearing it? When I say nun nun nun nun nun out loud it sure as heck sounds like an engine bouncing off the rev limiter. Not that I'd have done that when I zipped by Advance and saw any of the usual guys out front.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  8. #8 Re: Engine noise while accelerating 
    Turbo is the way to go. BillBoost37's Avatar
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    ps.. Bring on the stumping Ice ice baby ice.. lol

    I may be out of the 3800 game for a while, I still got it though.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  10. #9 Re: Engine noise while accelerating 
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    My 2003 3.8L V6 does this.......To my knowledge this is the rev limiter in action, so you don't blow the engine. I believe you can remove this with some different chip/PCM process, not sure I would do that thou. If you rev to 4K+ RPM and then drop in gear, you might be picking up pcs of your tranny for a few blocks
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  11. #10 Re: Engine noise while accelerating 
    Killa Bee Scottydoggs's Avatar
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    so oddly enough my car started to go nun nun nun nun.

    i got proof lol

    ended up being a bad wheel hub.

    Shared album - MrScottydoggs - Google Photos

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  12. #11 Re: Engine noise while accelerating 
    GT Level Member mguzzo's Avatar
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    would that be nun-nun-nun or whup-whup-whup?
    --
    "Silver Bullet" 98 GTP Coupe: Stock, rust free, and broadsided.
    Old '98 GTP Coupe: VS Cam, 3.0, S2IC, 42.5#, TOGs, N*/LQ4, Corsa. it once ran a 13 flat
    Older '98 GTP Sedan: Pullied, rockered, SSIC, etc. Stock 14.33 @ 96.5 / PB: 13.89 @ 101
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