Vibration When I Let Off The Gas

Red91hatch

New Member

Jul 1, 2012

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Jul 1, 2012

#1

• Jul 1, 2012

• #1

I have a vibration when I am going around 60-70 mph, when I let off the gas. When I am accelerating it is non existant. 1991 5.0 hatch, 5spd. Basically stock with cat back exhaust. I know I do need new front tires, but this vibration feels like its in the driveline. Any help would be appreciated.

 

8

86bluecobra

Advanced Member

Dec 20, 2004

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B.C. Canada

Jul 1, 2012

#2

• Jul 1, 2012

• #2

So you feel it in the steering wheel or do you feel it in your seat?

 

Red91hatch

New Member

Jul 1, 2012

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1

Jul 1, 2012

#3

• Jul 1, 2012

• #3

In the seat. Almost feels like unbalanced tires, but it is only when I let off the accelerator. When I hit the gas, even slightly, it goes away.

 

Onefine88

Previously 89SSC18

10 Year Member

Aug 3, 2006

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Jul 1, 2012

#4

• Jul 1, 2012

• #4

Could be the u joints on the drive shaft. Check to make sure the bolts on your u joints are tite. Or it could be time for new u joints.

Good luck

 

Red91hatch

New Member

Jul 1, 2012

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Jul 1, 2012

#5

• Jul 1, 2012

• #5

Was thinking so, I will check them. Thanks again.

 

8

86bluecobra

Advanced Member

Dec 20, 2004

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Jul 2, 2012

#6

• Jul 2, 2012

• #6

89SSC18 said:

Could be the u joints on the drive shaft. Check to make sure the bolts on your u joints are tite. Or it could be time for new u joints.

Good luck

Click to expand...

I had a vibration in my drivetrain and it turned out to be that somehow the 4 bolts holding my driveshaft to the rear end had loosened off. Went away after they were tightened up.

 

Gearbanger 101

Straight Outta Locash

20+ Year Stangneter

Aug 10, 2002

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Jul 3, 2012

#7

• Jul 3, 2012

• #7

Look for bad U-joint....and believe it or not, loose wheel nuts. Brought my old Ford Ranger into my High-school shop class as a teen. Checked all the brakes and I must have forgotten to tighten the lug nuts on one wheel when putting it back together. Made a hell of a vibration everytime I let off the gas. Checked it out when I got home and sure enough....5-loose lug nuts.

 

K

kenneth seymour

New Member

Jul 4, 2012

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Jul 4, 2012

#8

• Jul 4, 2012

• #8

hey brother...you need to change your harmonic balancer like yesterday...if that gives up, the motor is toast! good luck and hope it is just the u-joints

 

Gearbanger 101

Straight Outta Locash

20+ Year Stangneter

Aug 10, 2002

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Jul 4, 2012

#9

• Jul 4, 2012

• #9

kenneth seymour said:

hey brother...you need to change your harmonic balancer like yesterday...if that gives up, the motor is toast! good luck and hope it is just the u-joints

Click to expand...

The harmonic balancer should vibrate at all RPM, whether he's in gear, or not under engine load. The fact that he's getting it just under decceleration, tells me that his balancer likely isn’t the problem.