4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Need help troubleshooting please.

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Old 07-21-2008, 08:27 PM
  #1  
havok209
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Default Need help troubleshooting please.

Alright here are the things that my car does.

1. When I give it about 80+% throttle. It starts to misfire. I almost feels like it has a vacuum leak or the traction control starts to come on.
2. After about 30 mins of driving. Either 1 or more of the cylinders stop working. Almost like they're filled up with fuel or something. I can still feel the crank moving but then more and more start to fail until the motor just comes to a slow stop. If I rev it, it just goes up to about 4K Rpms and still feels the same.
3. The other day it took out the driver side fuel rail and injectors and the one closest to the front of the car was completely DRY. I didnt take the other side off because I had to get to work. But I swapped the dry one with a wet one from closer to the back of the car. I felt them each after I started the car and I could feel them pulsing.

Any ideas on what could be the problem. I'm kind of in a hurry to fix it because I'm driving across the country here in about a month due to a change of station(Army). All ideas are welcome.

Thanks a lot.
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Old 07-21-2008, 10:14 PM
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blackstallion666
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Default RE: Need help troubleshooting please.

Sounds like the fuel pump may be starting to fail. If you know anyone with a fuel pressure guage you can see if the pressure is dropping when the problem happens. Also when was the last time you change your fuel filter. It may be clogged. And a pretty cheap part to start with.
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Old 07-22-2008, 08:03 AM
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havok209
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Default RE: Need help troubleshooting please.

I replaced the fuel filter about 6-8000 miles ago. The car has got about 140,000 miles so it probably is the fuel filter. But I'm not sure if that would make it misfire like it does until all cylinders fail.
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