Thread: Engine is making a super loud noise when accelerating

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  1. #1 Engine is making a super loud noise when accelerating 
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    So here's the deal. The car idles very smoothly and drives good up until the "Boost" meter starts filling up (when I floor the pedal). All of the sudden, I hear a really loud rattling noise. Sounds like the end of the world, I swear. To be more specific, it sounds like as if there is a lot of rocks inside my engine. I blame the supercharger, but I could be wrong.

    Has anyone ever faced the same problem before? I've heard of the infamous coupler issue which I'm going to replace anyways, but I don't think that it's the coupler that's making such a loud noise. Can anyone suggest what exactly needs to be replaced? Or maybe there a link to a supercharger rebuild/clean DIY somewhere?

    The car has 90,000 on it and has had the transmission replaced already by the previous owner. Also, the oil pan is leaking, probably just the gasket that needs to be replaced. Maybe now is a good time to replaced the oil pump as well, huh?

    Thanks in advance!!

    Oh, and here's a video of the sound: http://youtu.be/eHPwJLWbQ-4
    Last edited by Dalakian; 06-11-2012 at 10:31 PM.
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  2. #2 Re: Engine is making a super loud noise when accelerating 
    The Blue One blueguy's Avatar
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    Could easily be the supercharger coupler.

    Get a video of it...or, take off the supercharger belt and see if the sound keeps up when you give it the beans.
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  3. #3 Re: Engine is making a super loud noise when accelerating 
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    Quote Originally Posted by bluegtp91 View Post
    Could easily be the supercharger coupler.

    Get a video of it...or, take off the supercharger belt and see if the sound keeps up when you give it the beans.
    You're right, here's the video that I've just made - 1999 Grand Prix GTP - loud noise when running - YouTube

    Please advise!

    Also, I have the following trouble-codes popping up:

    P0171
    P0650
    P0716
    P0717

    As far as my research goes, 1 of them is for the actual "Check Engine" light which is missing due to the previous owner, the others are for some speed sensor and the first one is for "System Too Lean"

    Thanks!
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  4. #4 Re: Engine is making a super loud noise when accelerating 
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    Also, do you suggest that I buy the ZZPerformance coupler + oil or all stock/GM?
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  5. #5 Re: Engine is making a super loud noise when accelerating 
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    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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  6. #6 Re: Engine is making a super loud noise when accelerating 
    The Blue One blueguy's Avatar
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    The first code is a vacuum leak...

    Find that, and fix it.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
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  7. #7 Re: Engine is making a super loud noise when accelerating 
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    Quote Originally Posted by bluegtp91 View Post
    The first code is a vacuum leak...

    Find that, and fix it.
    Thanks for advise. Going to take care of the vacuum leak asap. The problem with the supercharger still remains though. Waiting for my new coupler to arrive.
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