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Old 04-12-2010, 12:31 AM   #1
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94 GT Ignition problems

This is actually my 7th Mustang. I have had 5.0s, a 4.6 Cobra and a few 2.3 cars including an SVO.

I've been working on cars my whole life and done engine rebuilds, you name it.

I'm posting this to help others. I searched this problem on this forum and every other.

My car had one code 111; meaning everything is great. It had a horrible stumble and miss. I had recently done a tune up on the car new wires, plugs, rotor, cap, fuel filter, air filter, clean MAF etc.... The car ran great for about a month.

Over the next month I replaced all the old components, coil (MSD), ignition module (TFI), cap and rotor again (showed some burns at rotor tip), and checked for vacuum leaks etc. The car kept getting rougher and rougher.

Well the final problem was the aftermarket wires I bought and never suspected. I bought Taylor wires. In my experience they simply stink. It turns out Autozone cheapos are better. The lengths on them is messed up, but it was also messed up on the Taylors.

I'm going to order new Ford racing wires this week and new looms and change them again.

The Taylor wires didn't fit well on the end of the plugs, one of the wires pulled out of the plug connector. The boots don't seal as tight on the cap or the plugs. The wires are also already brittle compared to the cheapos.

This was the first and last set of Taylor wires I will ever use.

Interestingly enough, I thought part of my problem was a nice blue glow around the coil. I"ve found a few posts about it on a few different forums, but no one ever identified the cause of this issue. Someone even called it a "corona" as in bright EMF field. I tried 4 different coils and they all do it. The car is currently running an old Ford coil off a '94 351W and cheapo wires. It runs great compared to any coil with the Taylor wires.
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Old 04-12-2010, 09:30 AM   #2
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I've never heard of coils glowing on a 5.0...

Personally, I've always used Ford Racing/Motorsports ignition wires, an Accel ignition coil and Accel brass terminal cap & rotors - never ever have I ever had any issues w/ my Cobra or past Mustangs using that ignition setup.

I also have a Crane ignition box on the Cobra - still never an issue.

If an ignition coil is "glowing" or arcing, my first thought would be, the exterior casing of the coil has cracks in it - either very fine cracks or obvious cracks...
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Old 04-12-2010, 10:06 AM   #3
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I agree with cobra jet...except we use MSD wires on everything, especially with the MSD coils, boxes, etc. I think MSD still has the least resistence then any other wire out there.
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