Broken flexplate??????
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Joined: May 2000
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From: Mesa, AZ
Broken flexplate??????
Is it uncommon for a 92' Z28 w/350 to have a broken flexplate? At least that is what I think the problem is. My friend says it might be a blown motor but it idles smooth and the noise seems to be coming from the rear of the motor. Also the noise is eratic in its timing(not a constant knocking sound). It will knock a few times then quite then come back. Any pointers will be helpful.
TGO Supporter
Joined: Aug 1999
Posts: 14,811
Likes: 1
From: Jackson County
nothing else sounds like a cracked flex plate. makes a sort of growling sound. sounds like the thing could explode. i took a cracked flex plate off a 355 last winter, but it never made any noise, but wasn't that bad a crack either.
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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM
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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM
Supreme Member
Joined: Nov 1999
Posts: 1,507
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From: Elizabeth, Colorado
Car: '94 Corvette
Engine: LT1
Transmission: 4L60E
Believe me, an engine with a spun bearing doesn't like to run !
I've broke many flexplates, and they can easily be mistaken for a rod bearing, for the exceptions that the engine it self has good power, and good oil pressure.
Like 'ede' I've had little hair line cracks all the way to full blown separation of the center of the flexplate (slippage big time !!!)
Most causes of cracked plates are due to the bolt(s) either coming lose, or completely out.
An after market plate can handle much more stress, but can still break easily if you lose a bolt. So get a good set of ARP flex bolts, and some thread lock.
Good Luck,
Ron
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'82 Trans Am
'81 Camaro Z-28
'94 Vette LT1 Coupe
I've broke many flexplates, and they can easily be mistaken for a rod bearing, for the exceptions that the engine it self has good power, and good oil pressure.
Like 'ede' I've had little hair line cracks all the way to full blown separation of the center of the flexplate (slippage big time !!!)
Most causes of cracked plates are due to the bolt(s) either coming lose, or completely out.
An after market plate can handle much more stress, but can still break easily if you lose a bolt. So get a good set of ARP flex bolts, and some thread lock.
Good Luck,
Ron
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'82 Trans Am
'81 Camaro Z-28
'94 Vette LT1 Coupe
Senior Member
Joined: Jan 2001
Posts: 530
Likes: 0
From: Canada
Car: 1992 GTA
Engine: running
Transmission: working
Axle/Gears: both
Hi, Man YOU DO have a broken flexplate
I have a 92 GTA with L98 eng and had the
exact same noise!! Took her in to a GM
dealer and had a new one installed, as it
was running the eng would Knock and then
run great, what a spooky sound!! Good luck fixing it ,let me know how it went GTA.....
I have a 92 GTA with L98 eng and had the
exact same noise!! Took her in to a GM
dealer and had a new one installed, as it
was running the eng would Knock and then
run great, what a spooky sound!! Good luck fixing it ,let me know how it went GTA.....
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