Thread: Engine Noise

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  1. #1 Engine Noise 
    GTX Level Member Nates94's Avatar
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    I put about 300 miles on my car this summer. I changed the oil twice, and the oil looks clean. I pulled the valve covers, and inspected everything, and the top end looks great. I still have this noise. I am putting the car away for the winter today, but I want to figure out what this noise is for next summer. The car still runs great. I pulled the supercharger belt, but the noise is still there. Could this be just a bad lifter, flex plate issue? I hope it is not a bottom end issue. I doubt it since I haven't seen any metal in the engine. Seems to be the loudest at idle and around 2k. Any help guys? I put the car up on jack stands for now.


    https://www.youtube.com/watch?v=QKZ-BPM9cQU

    1991 Grand prix GT
    1994 Cutlass Supreme
    2000 Grand prix GTP
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  2. #2 Re: Engine Noise 
    Killa Bee Scottydoggs's Avatar
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    exhaust leak or a bad pulley maybe?

    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 
    GTX Level Member Nates94's Avatar
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    I checked all of the pulleys, and I couldn't find any making noise. I crawled under it while it was running to look for exhaust leaks, but it is not leaking anywhere. If I can't figure it out. I may tow it up to the local engine shop. I hate letting other people mess around with my cars. I haven't checked the flex plate yet.

    If it is a lifter noise, I will probably just live with it. I put a lot miles on an old 3.1 with a bad lifter, and as far as I know that car is still running just fine.

    1991 Grand prix GT
    1994 Cutlass Supreme
    2000 Grand prix GTP
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  4. #4 Re: Engine Noise 
    Killa Bee Scottydoggs's Avatar
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    run seafoam through it, that may show a exhaust leak.

    you ran the engine both belts off?

    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 
    GTX Level Member Nates94's Avatar
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    I have put some sea foam in it with no luck on finding an exhaust leak. Yeah I ran the engine with bolt belts off, and the noise was still there.

    1991 Grand prix GT
    1994 Cutlass Supreme
    2000 Grand prix GTP
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  6. #6 Re: Engine Noise 
    GTX Level Member Nates94's Avatar
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    And it's a rod knock. Damn, guess I need to look for a new l67
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  7. #7 Re: Engine Noise 
    Killa Bee Scottydoggs's Avatar
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    ouch. i hate that.

    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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  8. #8 Re: Engine Noise 
    GTP Level Member Burbman's Avatar
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    How did you make that determination?
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  9. #9 Re: Engine Noise 
    GTX Level Member Nates94's Avatar
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    I took the car to two different engine shops today. Both said the noise is a rod knocking. One guy I know, so I'm sure he wouldn't lie to me.
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  10. #10 Re: Engine Noise 
    GTP Level Member Burbman's Avatar
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    Ok thanks, i am not familiar with that sound so good to know.

    Sent from my SPH-L720 using Tapatalk
    2002 GTP Coupe, PSE supercharger ported with 3.4 pulley, Wizaired CAI, ZZP tune, AL 104's, front Plog, 3" DP, u-bend gone, hi-flo cat, W-Body tubular trailing and lateral arms, GMPP sway bars, Vogtland springs, 245/45-18 Michelin Pilot Sport AS/3 on 18x8 wheels, 42mm offset, Dual Aeroforce interceptor gauges on A-pillar pod
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