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.

Misfire from hell

Old 07-26-2013, 10:11 AM
  #71  
Danielsmustang
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Old 07-26-2013, 10:46 AM
  #72  
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Old 07-26-2013, 10:48 AM
  #73  
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This is the wire harness going through firewall, Could that foil wrapped wire be what the previous owner messed up?
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Old 07-26-2013, 05:38 PM
  #74  
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No the foil is a radio wave shield for the tach/coil and TFI signal. I'll revisit this thread in a few hours, I'm a little drunk right now. We'll figure out where the short is.

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Old 07-26-2013, 11:50 PM
  #75  
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Lol thanks man. So far csr has been drivi g good but misfire comes and goes. When I cruise after a little it gets better. Its idling at 1k now. When the car is warm. Has never done that. Im replacing tps tomorrow
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Old 07-27-2013, 06:38 PM
  #76  
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I replaced the tps and it didnt change. Voltage was the same. So I returned it. Misfire comes and goes. I have a small pop noise like it was a vacuum leak. But I dont know what to do with these codes. I have checked all grounds. The one by the batterry is fine, by the intake manifold by pcv valve is fine. The one by the xomputer is fine. Dont know guys. Im feeling it could be a component thats messed up causing the short. Im going crazy.
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Old 07-29-2013, 12:34 AM
  #77  
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Anything guys? Im pretty much stuck
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Old 07-29-2013, 06:27 AM
  #78  
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well lets take alook at where the trouble first showed up.

You inserted the jumper between the sto/mill and sti to read the codes and heard a pop? fuse blew?

Gotta be something in that wire or set of wires that's not right.
You should have gotten nothing there until you turned the key into the run position.

Examine that area and dig down into that harness where it goes to the computer.
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Old 07-29-2013, 06:40 AM
  #79  
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Pull your ignition switch make sure nothing is burnt inside of there.

Look at your neautral safety switch as it gets its ground from the same ground as all those sensors.
Examine all sensor plugs for burnt or melted appearance.

Examine fuel pump relay plug , fan relay plug , fan plug, 9 times out of 10 it is going to be a burnt or melted plug its pretty rare to find a short with in the harness it self unless the harness is cut apart and wires have been left out and chaffed against metal some place.
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Old 07-29-2013, 10:59 AM
  #80  
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Well now that you mention nuetral saftey, I dont need to step the clutch in to turn on the car. You think I should check there?
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