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1994-1995 5.0 Mustang SN95 Tech Forum

5.0L Talk | 5.0L Tech | 94-95 Tech | 1979-1993   1994   1995   Upload Pictures | Timeslips | Power Adders | Mustang Tech 


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Unread 01-23-2012   #1 (permalink)
Firefighter437 is offline Rookie


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Smile 1994 GT misfire problems.

Hopefully someone can help me out with this,
I have 94 Mustang GT and here recently its been having issues with misfiring. I noticed a slight misfire so i changed my plugs and wires. now when it idles, the mis firing became worse. so figuring that maybe it was a bad wire i switched back over to the old wires. now it "vibrates" all the time and its driving me insane!!! can someone help me out??
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Unread 01-23-2012   #2 (permalink)
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mybe you coil man.. also go to the auto parts store an get your alternator checked if your barttery or alternator are bad it could be sending a crappy charge to the coil..
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Unread 01-23-2012   #3 (permalink)
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Vibration may mean the harmonic balance has gone south. Check to see if there is any rubber protruding from the HB on the engine side and/or a wobble.

Your best bet for plugs are copper core style. You didn't say what plugs you used. Recheck the plug wiring to make sure they are all seated and in the correct order.

I do suspect you may have more than one issue.

Before spending a ton of money chasing hunches buy a OBDI code reader for about $22.00. You really need to be able to see what the computer is sensing to properly diagnose electrical issues.
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Unread 02-09-2012   #4 (permalink)
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Ok so I checked the time and its still vibrating the hell out of me and its driving me nuts! we even went back through and made sure that there werent any misplace wires. i didnt see any rubber on hb and we then suspected vaccum leak and we didnt find one of those either. what do i do???
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Unread 02-09-2012   #5 (permalink)
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Misfire is accompanied by a loud "pop" from the exhaust and a drop in RPM. More than likely it is the harmonic balancer. Does the shake go away when you give it a little gas at idle? The rubber piece doesn't have to be protruding to cause a shake. (my rubber piece wasn't showing when mine went out.)
Look under the hood while its idling. If the harmonic balancer is moving ANY other direction besides spinning, you have found the problem.
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