Car misfires when hot - Ford Mustang Forums : Corral.net Mustang Forum

 
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post #1 of 7 Old 05-10-2009, 09:54 PM Thread Starter
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Car misfires when hot

Got an interesting problem. Recently the car started misfiring when getting hot. What I noticed is that if I throw a new ignition rotor in it, the problem will go away for a few days, and come back doing the same thing. It's as if something is burning the rotor up.

I've changed Ignition coil, cap, rotor (several times), wires and plugs, but no luck in getting rid of the misfire. What can this possibly be?


94 Mustang GT. Stock.
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post #2 of 7 Old 05-10-2009, 10:37 PM
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Make sure no fault codes are present first......

I hope everyone reads this. Whenever you car starts acting up, as long as it running, just pull the codes first. Don't throw money at a problem you not sure of. The ECM is full of useful info, so use it.


Now, it sounds like you problem is while its in closed loop. Or a heat induced wiring problem. But pull the codes first. Its free and easy to do.


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post #3 of 7 Old 05-10-2009, 11:46 PM
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PIP sensor in the dizzy gets my vote. A.K.A magnetic pickup or stator.

'03 OW Cobra CPE 470/483
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post #4 of 7 Old 05-11-2009, 09:56 AM
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mine did that. turned out to be a bad spark plug wire that had been too close to one of the header tubes. i had equal length headers at the time and they had a tendency to burn up wires.

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post #5 of 7 Old 05-11-2009, 10:09 AM
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Check/restore/add to all your grounds.
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post #6 of 7 Old 05-11-2009, 10:27 AM Thread Starter
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Any links to where the grounds are in the engine bay?

94 Mustang GT. Stock.
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post #7 of 7 Old 05-11-2009, 11:16 AM
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Quote:
Originally Posted by ReplicaR View Post
What I noticed is that if I throw a new ignition rotor in it, the problem will go away for a few days, and come back doing the same thing. It's as if something is burning the rotor up.
Do you really think it's a ground? You can also take the armature off(it's the little wheel the rotor sits on) and clean it up with some sandpaper. If the "teeth" are rusted or chipped it could cause a problem.

'03 OW Cobra CPE 470/483
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