Thread: Engine Rumbling/Knocking, HELP Please :)

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  1. #1 Engine Rumbling/Knocking, HELP Please :) 
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    SO i just bought a 97 gtp sc, it's got some issues that i figured a car it's age would have, passenger window wont go up... when i listen to the engine with my window down i hear a rumbling, like i can hear the pistons. Seems louder than i think it should sound, but i have no idea how it should sound. Guy at Jiffy lube told me it could be the exhaust manifold. I need some idea of what it could be.
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  2. #2 Re: Engine Rumbling/Knocking, HELP Please :) 
    The Blue One blueguy's Avatar
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    Any SES lights? Pull the spark plugs to see if any of them are damaged...might have a chipped piston but not likely...or try to get a video of 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
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  3. #3 Re: Engine Rumbling/Knocking, HELP Please :) 
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    What are SES Lights? I guess i could take a video, the engine seems to operate ok. nothing really lacking power, just noisy. like i can almost hear the pumping.
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  4. #4 Re: Engine Rumbling/Knocking, HELP Please :) 
    The Blue One blueguy's Avatar
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    Service Engine Soon
    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
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  5. #5 Re: Engine Rumbling/Knocking, HELP Please :) 
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    No, there isn't service engine soon lights on. Jiffylube guy told me it sounded like an exhaust issue, but it sounds close to the motor, cuz i can hear the pistons pumping, idk. would take the exhaust off be very difficult?
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  6. #6 Re: Engine Rumbling/Knocking, HELP Please :) 
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    Get a video so we can hear the sound.
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  7. #7 Re: Engine Rumbling/Knocking, HELP Please :) 
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    supercharger coupler?
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  8. #8 Re: Engine Rumbling/Knocking, HELP Please :) 
    The Blue One blueguy's Avatar
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    I'm still voting for a video of this...maybe busted flex or mounts...
    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
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  9. #9 Re: Engine Rumbling/Knocking, HELP Please :) 
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    i dont have a camera. I also dont have the supercharger belt on. I have no idea how to get it on. i tried to put it on one day. found the piece that moves, but still doesn't want to fit. I think the guy at autozone gave me the wrong belt.
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  10. #10 Re: Engine Rumbling/Knocking, HELP Please :) 
    The Blue One blueguy's Avatar
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    This is straight from ZZP on most any belt you'll ever need...

    Stage 2 IC
    685 - 6-rib, 3.3"+
    680 - 6-rib, 2.90" - 3.20"

    08-685 - 8-rib, 3.0" - 3.20"
    08-680 - 8-rib, 2.60" - 2.90"

    Stage 3 IC
    680 2.6-3.0
    685 3.1+

    25060721 72.625" stock bonneville
    25060716 72" for 3.4" bonneville

    25060670 SS IC with 3.2+ SS IC

    4060660 - GTP/GS/SS supercharged with 3.2 - 3.5" pulley

    4060650 - GTP/GS/SS supercharged with 2.9 - 3.1" pulley

    060716 - Bonneville SSEi with a 3.4" pulley

    060670 - ss IC with a 3.2"+ pulley

    060667 - Stock GTP or ss IC with 3.0" pulley

    675 - Gen 5 blower S3 core 2.3"-2.55", Stage 2 core 2.4"-2.60" pulley

    060680 - ?Stage 2 intercooler 2.6 - 2.8" pulley
    Gen 5 blower S3 IC 2.6"-2.9", S2 IC 2.7"-3.0" pulley

    060685 - Gen 5 blower, stage 3 IC 3.0+ pulley
    ?Stage 2 intercooler 2.9 - 3.1" pulley

    060915 - Stock accessory belt for '99-03
    -also works with either UD WP pulley or OD alt pulley but not both

    060923 - Accessory belt for 99+ with UD WP pulley and alt UD pulley

    060905 - Stock accessory belt for '04+


    060935 - Stock accessory belt for 97/98 (94")

    060938 - Accessory belt for 97/98 with underdrive pulleys

    060970 - SS M90 for 97/98
    060950 - SS M90 for 99+



    915 99-03 stock accessory belt

    923 99-03 for underdrive water pump and Alt pulley

    905 04+ stock accessory belt

    935 97/98 stock accessory belt

    938 97/98 for underdrive water pump and Alt pulley



    667 stock S/C belt for GTP, GS, SS

    658 GTP, GS, SS S/C belt for 3.5-3.25 pulley

    650 GTP, GS, SS S/C belt for 3.2-3.0 pulley



    721 stock Bonneville SSEi Supercharger belt

    716 Bonneville with 3.5-3.25 S/C pulley



    875 99-03 accessory belt with Meziere water pump

    864 04+ accessory belt with Meziere water pump

    895 97/98 with Meziere water pump



    685 S/C belt s2/s3 ic 3.0-2.8 pulley (depends on tensioners)

    680 S/C belt s2/s3 ic 2.7-2.55 pulley (depends on tensioners)



    670 S/C belt ss ic with 3.2+ pulley

    667 S/C belt ss ic with 3.2-3.0 pulley
    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
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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