1994 Mustang GT, the motor shudders at low rpm and high rpm ? - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 06-20-2010 Thread Starter
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1994 Mustang GT, the motor shudders at low rpm and high rpm ?

Feels like something is out of balance. Getting a shudder at idle rpm speed but hit the gas a little and the shaking goes away until you give it more gas . Like 5000 rpm and up and it shakes very bad . Other than it feeling unbalanced I have no clue what is wrong with my 94 gt . Any ideas welcomed as I have to drive it to work and don't know how damaging this problem is.
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post #2 of 6 (permalink) Old 06-20-2010
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Is it doing it ONLY while driving, or does it do it at idle in park or neutral?

If it only occurs while driving, I would suspect it is something in the driveline like U-joints or something along those lines.

If it does it in neutral or park, while the car is not moving, I would suggest inspecting the harmonic balancer. Watch it while the car idles and look for any wobbling or wiggling. Sometimes it is easiest to notice it by actually watching the belt and seeing if it appears to track back and forth as the crank spins around. Also, a tell-tale sign of a bad harmonic balancer is that the rubber on the back side of it (toward the firewall) will begin to bulge out. Sometimes it will be bad enough that you can actually see it pushing out of the harmonic balancer. Finally, you could also check the timing. Assuming you know where the base timing was set (or at least have an idea - it should be somewhere around 10 BTDC), you can pull the SPOUT connector and hit it with a timing gun. A really weird base timing (for example, 25 ATDC) would indicate that the balancer has likely spun, as the chance of the car running when the timing is that far out is pretty small.

Matt

2006 GT - Vortech polished w/ intercooler, Eibach suspension, Hurst short-throw, some other goodies - tuned by Paul's High Performance. It moves...

and it collects dust admirably while parked for repairs in the garage...

SOLD - 1995 Black Mustang GT, AODE. Loved it, but I had to let it go...

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post #3 of 6 (permalink) Old 06-20-2010 Thread Starter
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Yes there is plastic or rubber coming out the back of where the crank is . It happens in neutral as well . Should I stop driving it now ? Any recomendations on a place to buy one for a good price since I'm trying to fix car on. A budget. And is that a job you have to know what your doing to change (harmonic balancer) ? Thanx for your help I appreciate it.
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post #4 of 6 (permalink) Old 06-20-2010
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YES - do not drive it at all, not even to the parts store. Much better to replace the HB than the entire lower end.

Harmonic balancer is pretty easy to replace. Just have to do a little disassembly first...

Get the tool to pull it from the parts store. I believe it is a free rental at Autozone. "Harmonic Balancer Puller" I believe it is called.

I am looking for a link as to how to go about replacing it, but thought I would post first so you see NOT TO DRIVE IT.

Matt

2006 GT - Vortech polished w/ intercooler, Eibach suspension, Hurst short-throw, some other goodies - tuned by Paul's High Performance. It moves...

and it collects dust admirably while parked for repairs in the garage...

SOLD - 1995 Black Mustang GT, AODE. Loved it, but I had to let it go...

mjmalegalsolutions.com
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post #5 of 6 (permalink) Old 06-20-2010
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Ford Racing M-6316-M50 - Ford Racing Crankshaft Damper Assemblies - Overview - SummitRacing.com

Prolly not the best one made, but it will work. You can also find them at the major chain stores if you are just interested in replacing without upgrading.

There are lots of option for harmonic balancers, up to $400 plus. For a stock car, I personally don't see the point, but that's just me...

Matt

2006 GT - Vortech polished w/ intercooler, Eibach suspension, Hurst short-throw, some other goodies - tuned by Paul's High Performance. It moves...

and it collects dust admirably while parked for repairs in the garage...

SOLD - 1995 Black Mustang GT, AODE. Loved it, but I had to let it go...

mjmalegalsolutions.com
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post #6 of 6 (permalink) Old 06-21-2010 Thread Starter
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Having balancer replaced tomorow found it for 68.00 from parts store . Didn't drive the stang to get the part either since I saw your post . Thanks again till the next problem .
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