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.

Problem over 4000rpm

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Old 05-25-2007, 06:06 PM
  #11  
skielk
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Default RE: Problem over 4000rpm

The car had to be dyno tuned since the egr is turned off and many other things, i'm using copper plugs I personally reaplced them, along with the cap rotor and wires when I got it. As for the fuel I watched the gauge today and saw it bouce around alot, when I checked the sensor I notcied a loose wire so i'm going to fix that and check it out when I take the car out tonight. I also have a vortech FMU, I'm not sure if this could play into my problem but since it does control fuel it might.
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Old 05-25-2007, 06:19 PM
  #12  
92hatchLX
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Default RE: Problem over 4000rpm

I doubt the car was tuned if it still has the FMU!! Something's fishy. Sounds like fuel starvation.
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