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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 05-28-2014, 10:08 AM   #1
jcgarcia8318
 
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Default Mustang dies while running no symptoms

So i have a 93 Mustang lx fox body with a 5.0 swap. while driving it just kills over. i still have battery power but no spark to run motor. its happened multiple times over the past week. It will start back up after time of cooling. over the weekend i replaced the tdi and thought it was solved. checked ground and power wiring all is fine. Confused and at a loss hellllllllp my pony!!!! Pcm failure? pick up gone bad? what?
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Old 05-28-2014, 12:57 PM   #2
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Does the voltage meter go up and down or does it just die? That happened to me this weekend, but it turned out to be my HID ballast shorting out, and was pulling so much power it stalled my motor!
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Old 05-28-2014, 01:03 PM   #3
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I just recently had similar issues with my cousin's '95 GT too. We confirmed both the battery and the alternator were good and didn't find any shorts. That's when we started looking at the ignition components and found the coil was going bad. Once the coil got hot after running for a while it would intermittently fail. After replacing the coil, the car has been running strong!

I know it's rare for the coil to fail intermittently, but it's still something you may want to check. Hope this helps!

Shane
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Old 05-28-2014, 02:05 PM   #4
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I have a msd coil pack and it seems to be working fine. I'm at a complete loss.
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Old 05-28-2014, 07:42 PM   #5
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Could certainly be a bad TFI module. But if it is not, are you sure it's spark and not your fuel pump?

Last edited by yurizx6r; 05-28-2014 at 07:45 PM.
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Old 05-29-2014, 07:56 AM   #6
88 orangepeel notch
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+1 ^^^

We need to know for sure which is missing, spark or fuel ?
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Old 05-30-2014, 08:21 AM   #7
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I'm pretty sure I'm getting fuel I hear the pump kick on but haven't looked at the injectors. I do have a msd control box and spark coil.this problem happens intermittently more now since irs getting hotter out. After it cools it sometimes won't start back unless I take the plug wire from the coil going to the distributer and sorta jump a spark to get spark flowing again. Hope this makes sense all.
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Old 05-30-2014, 10:18 AM   #8
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It sounds like the classic TFI module going bad and I know you just replaced it, but maybe pull it off and get it tested at Autozone, Advance, O'Reily, whatever chain you use. Have them test it 3 times so it gets hot. New parts don't always mean good parts. Just an idea and it's free.
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Old 05-30-2014, 11:41 AM   #9
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Let us know what you find out. I'm putting my money on the TFI module. If it's the stock one, upgrade it and get an MSD one anyways. Couldn't hurt either way. Even it that isn't the issue, you can at least rule it out.
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Old 06-01-2014, 10:22 AM   #10
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Still no go guys
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Old 06-01-2014, 10:22 AM
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