Welcome to Mustang Evolution.
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05-20-2008, 07:54 PM
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#1
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94 cobra vibration issue
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Registered User
Join Date: May 2008
City: grayling
State: Michigan
Posts: 4
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i just baught a 94 cobra last year that had a moderate vibration at about 2,ooo rpm and up. the guy that I baught it from had put a new harmonic balancer on it last year because the old one was bad. i recently put new motor mounts in it, changed clutch and preasure plate, had the flywheel turned. the vibration still has not went away. if anything it seems to have gotten worse. would he have gotten a bad harmonic balancer, or should I have replaced the flywheel rather than having it turned. or could it be internal? any help would be greatly appreciated.
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05-21-2008, 08:37 AM
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#2
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Re: 94 cobra vibration issue
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WTF^^...
Join Date: May 2003
City: Hoover / Florence
State: Alabama
Posts: 26,868
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define the vibration, entire car, clutch, rear end? etc
__________________
2003 REDFIRE COBRA #3938 of 5082 @ 05/27/2003 1 of 414
Polished Borla Stingers, MGW Shifter, JLT CAI, SS Inserts, MM FLSFC, MM CC Plates,
10th Anniv Brakes, SS Lines, H&R Race springs, IRS Brace, MRT Hood Struts
ME.com Member #29 - 400rwhp/380rwtq
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05-21-2008, 05:04 PM
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#3
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Re: 94 cobra vibration issue
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Registered User
Join Date: May 2008
City: grayling
State: Michigan
Posts: 4
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it vibrates the entire car. seems to be comming from the front. the motor looks like it doesn't vibrate at all from the outside but when you sit in it you can definetly feel the vibration.
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05-21-2008, 08:49 PM
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#4
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Re: 94 cobra vibration issue
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postarama
Join Date: Aug 2003
City: Jackson
State: Mississippi
Posts: 24,136
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You sure you don't have a flat spotted tire or a well worn tire?
__________________
"I'm not driving too fast...just flying too low"
Mine:
-87 ranger- broke
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
Our's:
90 7up vert - new project
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05-22-2008, 08:43 AM
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#5
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Re: 94 cobra vibration issue
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Registered User
Join Date: May 2008
City: grayling
State: Michigan
Posts: 4
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it vibrates at a stand still but it does seem to get a little worse when driving down the road.
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05-24-2008, 04:07 PM
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#6
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Re: 94 cobra vibration issue
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Scut
Join Date: May 2005
City: Thousand Oaks
State: California
Posts: 492
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drive shaft out of balance? was the engine rotating assembly ever messed with? If the internals were replaced and not balanced the whole car would vibrate bad.
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05-25-2008, 04:24 PM
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#7
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Re: 94 cobra vibration issue
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ME hometown supporter
Join Date: Jan 2005
City: Harvest
State: Alabama
Posts: 912
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if the engine hasn't been messed with internally, i'd do a engine balance test and see if you can locate a problem down to a single cylinder.. alot of things that could actually be.
__________________
5.4 liters of pushrod 
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05-28-2008, 04:28 PM
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#8
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Re: 94 cobra vibration issue
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Registered User
Join Date: May 2008
City: grayling
State: Michigan
Posts: 4
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thanks for all the replys guys. I just baught a new flywheel and replaced the original one that I had turned and it cured the vibration. Evidently the flywheel must have been warped or out of balance or someone could have put the wrong one in before I bought it? I am not sure what the heck happened, but its fixed with the new flywheel. woohoo!!
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05-28-2008, 04:52 PM
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#9
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Re: 94 cobra vibration issue
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Scut
Join Date: May 2005
City: Thousand Oaks
State: California
Posts: 492
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nice....glad to hear you got the problem fixed....its usually really difficult to find vibrations and noises.
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05-29-2008, 08:23 AM
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#10
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Re: 94 cobra vibration issue
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Human Mamogram
Join Date: May 2008
City: Baton Rouge
State: Louisiana
Posts: 598
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glad you found such an odd problem, ive never heard of that unless somebody installed a flywheel from a different year.
__________________
2002 GT,T56, forged 99 cobra motor,04 cobra heads/cams,UPR tubular K-member kit,full UPR solid race rear suspension,NOS direct port wet kit,fidanza flywheel, spec2+ clutch,motorsport 4:10s,full Hearthrob exhaust.
uhh.. i mean its stock... 
132 rwhp & 4ft/lbs tq
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05-30-2008, 07:55 PM
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#11
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Re: 94 cobra vibration issue
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ME hometown supporter
Join Date: Jan 2005
City: Harvest
State: Alabama
Posts: 912
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I wonder if someone installed the wrong counterweight on the old one? Glad you got it working though!
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5.4 liters of pushrod
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