Thread: Suspension noise and tire issue

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  1. #1 Suspension noise and tire issue 
    GTP Level Member dmahlikGT's Avatar
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    Need help trying to figure out what I been hearing for awhile in my front end. Happens every time I take off half throttle or more theres like this knockin noise in succession(usually like 2 or 3 little knocks) almost like metal on metal or metal against hard plastic. It happens sometimes too when i put the car in reverse it knocks real quick but all the time when I take off harder then usual.Car has 116k miles and drives fine otherwise. Then part 2 of my problem is my rear passenger tire is lumpy-like on the inner edge and when Im braking,especially from high speeds my rear shimys from that deformed tire, I heard its called "cupped tire", what causes that, and any ideas?
    04 GTP-3.6 pulley, custom tuned, Intake, headers,thrush exhaust, al104 plugs, 180* stat, shift kit, flipped mounts

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  2. #2 Re: Suspension noise and tire issue 
    Killa Bee Scottydoggs's Avatar
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    check your lower engine and tranny mounts, and the tire problem could be alignment related. or you dont rotate your tires. or theres more of a issue with worn parts causing the cupping.

    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: Suspension noise and tire issue 
    GTP Level Member dmahlikGT's Avatar
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    I was thinking a mount too then a mechanic said it could be my sway bar link. That particular tire has not been rotated since I had the car. But will be replacing that tire next week. Will have my suspension rechecked next week.
    04 GTP-3.6 pulley, custom tuned, Intake, headers,thrush exhaust, al104 plugs, 180* stat, shift kit, flipped mounts

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  4. #4 Re: Suspension noise and tire issue 
    Killa Bee Scottydoggs's Avatar
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    could be the sway bar.

    pop the hood, shift it from P to R then to D, while watching the engine, if its jerking back and fourth a lot, the mounts are bad.

    flipping the dog bones can also help calm this jerking around when shifting in and out of gear.

    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: Suspension noise and tire issue 
    GTP Level Member dmahlikGT's Avatar
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    Yea i flipped my mounts in the dog bones already but may upgrade to polys soon since one of the bushings is torn a little and could be what I hear when I shift to reverse. Just wanted a second opinion and other possible culprits. Thanks
    04 GTP-3.6 pulley, custom tuned, Intake, headers,thrush exhaust, al104 plugs, 180* stat, shift kit, flipped mounts

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  6. #6 Re: Suspension noise and tire issue 
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    Loose tie rod end, lca bushings, ball joints, subframe bolts or bushings all could be possible culprits too.

    Sent from my SCH-I535 using Tapatalk 4 Beta
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  7. #7 Re: Suspension noise and tire issue 
    GrandPrix Junkie
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    On my 00 GT the cause of my cupped rear tires is due to the worn out struts/springs. I know they're shot. Cupped both tires on the inner edge. Made it sound like a 4x4 on the highway,lol... That and it vibrated the heck out of the car.
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  8. #8 Re: Suspension noise and tire issue 
    GTP Level Member dmahlikGT's Avatar
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    Yea my previous car was an 01 gt and same issue had 4 different cupped tired and i needed a whole host of suspension repairs. So im hoping its nothing more then just lack of tire rotation.
    04 GTP-3.6 pulley, custom tuned, Intake, headers,thrush exhaust, al104 plugs, 180* stat, shift kit, flipped mounts

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  9. #9 Re: Suspension noise and tire issue 
    GTP Level Member dmahlikGT's Avatar
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    Just an update, turns out that 2 of my passenger side diagonal brace bolts were stripped and allowed the bar to flex whenever I put too much load to the front tires. So mechanic removed the bar and i took a quick drive from low speeds and everything and not a sound plus the car actually pulls better from a dead stop now since theres no more interference . They said I can leave it off but is that a good idea or should i replace the bolts? Dont want to mess up my handling.
    04 GTP-3.6 pulley, custom tuned, Intake, headers,thrush exhaust, al104 plugs, 180* stat, shift kit, flipped mounts

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