Help, car wont run right and it just started out of nowhere.

bjl95mustang

Founding Member
Jan 18, 2000
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36
Austin,TX
Help, car wont run right and it just started out of nowhere.

OK, first off I have been trying to track down a big exhaust leak in my car. It ended up being the stock h-pipe broke into 2 pieces right by the Pass o2 sensor. It has been running really rich because of this. The car was idling rough and I lost some power but that was about it. I went to work Tuesday night and it was fine when I got there. When I left work my car wouldn't start and if it did it was really rough then it died. There was a strong gas smell. After playing around with it for 10 min it started to run like it did with the exhaust leak and I made it home. Today when I went to work it started up fine but when I left work to run an errand while I was on the highway cruising the rpms would cut down about 1000 for about 5-10 SEC then come back up. It did this a few times then it died on me. I sat there for a few min then it started up fine and I made it almost where I wanted to be then it bogged down and died. I ended up having to get it towed home. I replaced the stock h-pipe with a bbk unit I was going to install later and I cleared the codes and the computer. I have spent all night playing with it and I have had no luck. At first it was an intermittent problem now it wont go away. I replaced the spark plugs and they were carboned up after trying to get my car to run at all. I now have spent 12 HR trying to fix my car and I need any ideas you guys can give me. Also my fp stayes good and steady untill the car dies. And I have a msd 6al box. I took it out and I still had problems.

Thanks,
Brandon
 
what does the fp read after it dies?

on my car the fuel pressure stays at what it was when i shut it off.

so if it drops dramatically when the engine dies i'd say its a fuel delivery issue

other than that check all the wires, cap and roter, all your wire harness connections, coil, vacume lines, and any thing else you can think of.


good luck!!!