I got a 1990 Mustang GT with something unbalanced

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naildriverinnc

New Member

Sep 30, 2007

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Mar 10, 2008

#1

• Mar 10, 2008

• #1

I got a shimmy and a shake in the car it's not the harmonic balancer or the flywheel. Does anyone know how the car would act if the crackshaft was bad or could this be the cause of my shimmy and shake. The car is a 5 speed and this is what the guy done to the car before I bought it NEW 5.0L CRATE ENGINE W/ GT40 HEADS AND VALVE TRAIN
- NEW NEW WORLD T-5 TRANS AND SHORT THROW SHIFTER
- NEW 3.73 GEARS
- NEW HIGH PERFORMANCE FORD
MOTORSPORT CLUTCH
- COBRA INTAKE AND 70MM THROTTLE BODY
- COLD AIR INTAKE & UNDERDRIVE PULLEY'S

Any ideas? ..........anyone

 

NKau

Founding Member

Dec 15, 2001

1,346

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Jefferson, WI

Mar 10, 2008

#2

• Mar 10, 2008

• #2

Motor or tranny mount(s) bad or not tightened?

 

MrStang123

New Member

Jul 6, 2004

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NY

Mar 10, 2008

#3

• Mar 10, 2008

• #3

Get your tires balanced?

 

NIKwoaC

中國製造

15 Year Member

Oct 31, 2006

5,525

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Chengdu Province

Mar 10, 2008

#4

• Mar 10, 2008

• #4

Driveshaft maybe. Check to make sure all bolts are in and tight. Best thing you could do right now is get under the car and look at any and all rotating pieces (drivetrain) and look for loose or missing bolts.

Edit: Does the car shake when it sits still? I should have asked this first. That would help narrow it down to the motor.

 

NKau

Founding Member

Dec 15, 2001

1,346

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37

Jefferson, WI

Mar 10, 2008

#5

• Mar 10, 2008

• #5

NikwoaC said:

Edit: Does the car shake when it sits still? I should have asked this first. That would help narrow it down to the motor.

Click to expand...

I read another post of his (if it's the same guy) where he stated the car does shake somewhat when in neutral, but worse with when revved. Not a whole lot of things it can be if that's the case.

To the OP, how well is it running? Does it rev cleanly and smoothly? Could be a really bad misfire?

 

back2fox

Member

Oct 7, 2006

73

0

6

Mar 10, 2008

#6

• Mar 10, 2008

• #6

I went through this last year. After I changed the tranny mount, driveshaft, flywheel, harmonic balancer. I finally checked the motor mounts and one was loose.

Lesson learned. Check for loose nuts and bolts first.

 

I

iwashmycar

20+ Year Stangneter

Apr 7, 2004

1,236

1

39

Columbus, Ohio

Mar 11, 2008

#7

• Mar 11, 2008

• #7

fan blades?.. ive done that and its not a very comforting feeling

 

Strype

Cuthbert catcher

Founding Member

May 11, 1999

61

34

104

Huntsvegas, AL

Mar 11, 2008

#8

• Mar 11, 2008

• #8

I've had my fan blades eat into the shroud because of broken mounts before.

 

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naildriverinnc

New Member

Sep 30, 2007

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Mar 11, 2008

#9

• Mar 11, 2008

• #9

The car still has a vibration when sitting still and reviving it up. There is no lose of power

 

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naildriverinnc

New Member

Sep 30, 2007

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Mar 11, 2008

#10

• Mar 11, 2008

• #10

And I've checked the motor mounts they are fine

 

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naildriverinnc

New Member

Sep 30, 2007

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Mar 11, 2008

#11

• Mar 11, 2008

• #11

It idles very nice no misfires