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.

help car runs crappy

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Old 05-21-2006, 10:23 PM
  #1  
iowastang
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Default help car runs crappy

i have a 88 gt, converted to mass air. Car ran fine until i put new parts on it. I put upper and lower intake, #24 injectors, 190 lph pump, adjustable fuel pressure regulator, tune up, mass calibrated for injectors and 70 mm throttle body and egr spacer. Car revs up fine but when I drive it, it has a miss like the plug wire is crossed. I've checked 5 times and its right. I was wandering what happens if a fuel injector is bad it it will miss like that, they were used injectors. Also what fuel pressure should I run? Any help would be appreciated.

Thanks

Charles
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Old 05-21-2006, 10:27 PM
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2 kwik
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Default RE: help car runs crappy

I would put the 19's back in with the ole maf and see if problem goes away.....
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Old 05-21-2006, 10:29 PM
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Stevens91gt
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Default RE: help car runs crappy

ya y'd u put 24lb injectors?
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Old 05-21-2006, 11:12 PM
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iowastang
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Default RE: help car runs crappy

i have nitrous too. I thought it would help. I don't really wanna switch them again. Is there a way to test them?
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Old 05-21-2006, 11:32 PM
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Mustang#2
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Default RE: help car runs crappy

They didn't happen to be 24's out of a cobra did they? Those are low impedance and won't work with the factory GT EEC. You would have to switch to the Cobra computer.
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Old 05-22-2006, 12:05 AM
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iowastang
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Default RE: help car runs crappy

i dont know? is there a way you can tell?
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Old 05-22-2006, 12:07 AM
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Mustang#2
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Default RE: help car runs crappy

That is one thing I don't know... I will see what I can find out.
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Old 05-22-2006, 05:37 PM
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iowastang
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Default RE: help car runs crappy

if the mass is sent up for #24 injectors, won't it run crappy with factory injectors?
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