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Major shake\vibration

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Old 10-02-2009, 05:31 AM   #1
Join Date: Oct 2009
Vehicle: 1994 mustang GT
Location: nh
Posts: 1
Default Major shake\vibration

What would cause my 1994 GT to have a major shake/vibration whenever the accelerator pedal is released? The engine and body both shake severely and then dissipates with 10-20 seconds. I believe it is either an ignition, engine control or fuel system issue.
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Old 10-02-2009, 08:38 AM   #2
93 LX FiveO
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sounds like the harmonic balancer is shot

with your car running and idling, take a look at the balancer and see if it's wobbling.
starting from scratch.....

1991 GT with 93k miles
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Old 10-02-2009, 12:24 PM   #3
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Originally Posted by badpuppy View Post
whenever the accelerator pedal is released?

You need to elaborate a bit more on this.

Is it rpm related or just when the rpms are ramping up.
Neutral or while driving?
Is the engine running well or misfiring?
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Old 10-02-2009, 04:47 PM   #4
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Need more info. Could be a number of things. Tranny, Balancer, Detonation, Flywheel......etc
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Old 10-02-2009, 08:44 PM   #5
Bubba 95SN
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Any noise with this? Auto or manual?
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Old 10-10-2009, 10:33 AM   #6
Join Date: Oct 2009
Vehicle: 1989 Mustang GT
Location: Kentucky
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I have a 89 GT. When it gets to a crusing speed of around 70 it starts to vibrate. I can feel the shifter vibrating realy hard as well. Its only when i am at a speed of over 70 or so. When its getting there it seems to be smooth, but once it plains out at that speed i have this problem. I did have a plug put in the back tire and also changed my gears to 3.73. I cannot figure it out
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Old 10-10-2009, 10:37 AM   #7
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possible drivetrain/driveshaft issue if its only at higher speeds ?? tires balanced ?

Last edited by 06stangGT; 10-10-2009 at 10:42 AM.
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Old 10-10-2009, 10:37 AM
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