Thread: Symptoms of broken flex plate?

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  1. #1 Symptoms of broken flex plate? 
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    Did a quick search and yielded two pages of no answers. Recently noticed at idle either in park or in neutral I hear ticking sound from the bottom of the car.when I put it in gear the ticking stops.my guts is the flex plate cracked? I know I would know for certain if I look under the car and inspect it myself but don't have the time currently to do so.
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
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  2. #2 Re: Symptoms of broken flex plate? 
    GTP Level Member 01gpgt01's Avatar
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    YouTube - gtp - broken flex plate

    Sounds like thats what you got. There also have been instances of where the bolts backed out on these cars, Might want to see about thats aswell
    Last edited by 01gpgt01; 03-20-2011 at 02:01 PM.
    2001 GT. A few here and there mods http://www.streetfire.net/video/2001...ynp_208097.htm

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  3. #3 Re: Symptoms of broken flex plate? 
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    i listened to the sound in the vid. it doesnt sound as bad as that. its more of a ticking sound. i'll try and get a vid but its been raining here since yesterday and that sucks
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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  4. #4 Re: Symptoms of broken flex plate? 
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    heres what the ticking sound is like:
    click here
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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  5. #5 Re: Symptoms of broken flex plate? 
    Donating User Swiggles's Avatar
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    fst yours doesnt sounds as bad but it sounds similar. maybe its a small crack. are you sure your flexplate bolts are tight?
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  6. #6 Re: Symptoms of broken flex plate? 
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    Quote Originally Posted by Swiggles View Post
    fst yours doesnt sounds as bad but it sounds similar. maybe its a small crack. are you sure your flexplate bolts are tight?
    if by the bolts you meant the torque converter to flywheel(3 of them), i checked each one and they're tight. trannyman used locktite on them fwiw. now if you meant the bolts connecting the flywheel to the motor, then no and i imagine that'll be hard to see from under the car without disconnecting the TC from the flywheel. i peeked under the car and i could not see or make out any cracks on the areas where they tend to crack. perhaps its more upward near the 6-8 bolts where it connects to the motor.
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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  7. #7 Re: Symptoms of broken flex plate? 
    GTP Level Member 01gpgt01's Avatar
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    Tap it, You can hear a crack in them
    2001 GT. A few here and there mods http://www.streetfire.net/video/2001...ynp_208097.htm

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  8. #8 Re: Symptoms of broken flex plate? 
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    i was planning on doing that but i spent nearly half an hour closely inspecting the 3 spokes that tend to crack and actually found a feint hairline crack that is close to the center bolts that mate to the motor. so, looks like i'll need another flexplate and once i do, get a shop to do the swap

    upside is im planning on getting a meziere billet flexplate
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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  9. #9 Re: Symptoms of broken flex plate? 
    GTP Level Member 01gpgt01's Avatar
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    Sweet, glad you got it figured out!
    2001 GT. A few here and there mods http://www.streetfire.net/video/2001...ynp_208097.htm

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