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What could this be?!?

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  • What could this be?!?

    Here is my issue:
    My car, a 96 LT1, has long tube pacesetters and an ory into a catback(im thinking this is an exhaust issue). When I accelerate the car sounds great; crisp and throaty, it really sounds awesome! The problem is when I decelerate, or just basically let off the gas to just slow down or maybe even shift, I hear this noise that sounds like A LOT of air coming from the engine bay. It's like a loud mixture of air/vibration noise at the same time. It's not a hiss by any means, more like a "vvvvvvvvv" sound lol. My headers have the locking bolts and I've checked them a couple times and they are tight. It may not be exhaust related at all, but that sure seems like the most likely cause. Any ideas??
    The car idles great, runs great, pulls hard, starts good... just a noise deal. It's been doing it for a while, but I've had enough of it. The doesn't actually seem to be vibrating, just sounds like it.
    Pacesetter LT's, Pacesetter ORY, full MSD ign., 2 step, rear LCA's, SFC's, B&M Ripper, poly motor mounts, Nitto NT05R's, WS6 wheels, KYB AGX adj. suspension, Eibach Sprotline springs, Trickflow elbow w/K&N, All HVAC deleted w/ delete panel, no AIR, No EGR

    96 Z28 Camaro M6
    2008 Silverado quad cab LTZ

  • #2
    Stumps me, maybe a vid to hear it?
    - Brian Meissen
    Owner, MiFBody.com
    Administrator, LTxTech.com


    1994 Camaro LT1 Transplant - 357ci LT1, cammed, stalled, and driven.
    2022 Camaro LT1 - "Cherry Bomb 2"
    Michigan FBody Meet & Greet Car Show 2022
    June 4th, 2022 - 9am to 3pm!!!
    The HUB Stadium, Auburn Hills, MI

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    • #3
      pulleys or belts?
      sigpicMODS: SLP DUAL/DUAL EXHAUST, 160 STAT, MTI LID, SHANER S3 T.B., SMOOTH BELLOWS, DESCREENED MAF, TUNNEL BRACE, UMI SFC & PHB, STRANO SWAY BARS, DRILLED/SLOTTED ROTORS, WHISTLER LIGHTS, BLACK BILLET GRILLE w/69'SS EMBLEM, BLACK SMOOTHED TAIL PANEL w/69'SS EMBLEM, BLACK SS HOOD INSERT, INTIMIDATOR SS WHEELS.

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      • #4
        yeah this is almost impossible to describe /diagnose with out actually being in the car. I'll see if I can get a vid up..
        Pacesetter LT's, Pacesetter ORY, full MSD ign., 2 step, rear LCA's, SFC's, B&M Ripper, poly motor mounts, Nitto NT05R's, WS6 wheels, KYB AGX adj. suspension, Eibach Sprotline springs, Trickflow elbow w/K&N, All HVAC deleted w/ delete panel, no AIR, No EGR

        96 Z28 Camaro M6
        2008 Silverado quad cab LTZ

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        • #5
          belt, pulley, cold airs occasioanlly can whine or hiss
          91 Trans am, 305, Lt1 cam, 24lb injectors, headers, SLP LM2, SW chassis, massive panhard, lowered, modded TPI, Tuned, 4.10s, Lincoln locked
          85 Z28 406/th400?/3.42 4th gen disc rear/4th gen dash
          00 Tahoe Z71........Stock
          97 K1500 lt4 cam, 1.6s, MPFI, Solid axled, IROKs,------winter beater

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          • #6
            Originally posted by TylerT/AZ28 View Post
            belt, pulley, cold airs occasioanlly can whine or hiss
            Well it sounds exactly like a manifold/header leak, but I really don't think it is because it only does it on the decel. Acceleration is fine. I'll see what I can do for a vid.
            Pacesetter LT's, Pacesetter ORY, full MSD ign., 2 step, rear LCA's, SFC's, B&M Ripper, poly motor mounts, Nitto NT05R's, WS6 wheels, KYB AGX adj. suspension, Eibach Sprotline springs, Trickflow elbow w/K&N, All HVAC deleted w/ delete panel, no AIR, No EGR

            96 Z28 Camaro M6
            2008 Silverado quad cab LTZ

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            • #7
              Re: What could this be?!?

              Like I said before every internet sound, sounds alike. Video is definitely needed.

              Sent from my DROID4 using Tapatalk 2

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              • #8
                heat shield or a exhaust mount rattle

                EDIT....could be the baffles inside your cat or muffler as well
                Last edited by Gregs_gsxr; April 10th, 2013, 10:18 AM.
                '91 Camaro Modded, LSx, House of Kolor Intense White, lowered, GS chrome 18" wheels, 14" Brembo CTS-V on all 4 corners, LS rear end, FP suspension components

                " When in doubt...throttle out ! "
                ENVYsion Entertainment Group

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