Question about 2003 Ford Mustang

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1999 ford mustang won't start, been in shop since sept.

Hi everyone! I'm at my witts end about this and just about ready to sell this car to a junk yard. Hoping someone could open up some insight or at least direct me to a crackerjack mechanic who can fix it. The car will not start. It has been acting up for a while and would die after driving it a while, but when I would pull over, kill it, and restart it would keep going for a bit. Everytime it stops working the security light blinks continuously and the odometer goes to all dashes. The shop I took it to replaced the computer and some other parts that cost me 1500 dollars. It ran long enough for me to take it to baton rouge and get it retuned on the dyno (it has a supercharger) and it started acting up again on my way back home. It was like it was dying unless I would floor it. I pulled over several times and stopped and restarted the car
Eventually it died and I wasn't able to start it at all again. Had it towed back to lafayette once again with the same problem as originally I had. Also sometimes when starting it it would run until I put it in drive then just die on me. Like it didn't have any power at all. The shop has supposedly tested everything from ignition to fuel system, but they think its a pats problem. The computer is brand new, and the pats was supposedly disabled at shop that did the reprogramming. Both shops have yet to find the problem, and I don't know where to go from there. Please help!

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  • wise_micah Dec 07, 2008

    Yeah. I had it tuned by a shop in Baton rouge. They said it was the first time they ran across this problem. Also, I got 2 new keys cut at the Ford Dealer. They were all programmed into the car along with the original after the new computer was put in. The car ran for a while, and the problem seems to be coming and going. Like they can read from the computer 1 time out of every ten times they try to. All I know is I'll never own another ford. The shop assures me they will figure it out, but when? I really wish I knew of another shop I could take it to. Since it has a lot of aftermarket parts, the dealership didn't know what to do with it. They were stumped, so I took it to this other shop. He made me 2 programs, one with pats disabled and one without it disabled. I can try the one that's not disabled, but I'll have the same trouble. I had this problem before they disabled the pats system. The original pcm I had pats wasn't disabled.

  • wise_micah Dec 07, 2008

    BTW, the car has 92000 miles, but it doesn't have the original engine. The engine was replaced at 60000 miles with a brand new one.

  • wise_micah Jan 25, 2009

    Gotcha. Just took the car to another mechanic at the beginning of Jan. It seemed it had several bad grounds, 2 bad wires going to the computer diagnostic connector, some other bad part I don't recall what it was, some bad transmission lines, and needed a new coolant reservoir. LOL. In addition they found some bad wiring going to the O2 sensors and busted boots for ball joints. They really did a good job so far. Though it will cost an arm and a leg, it should be running hopefully soon after they get the transmission lines in. It seemed to have nothing to do with pats. That was they symptom and not the cause it seems. I'll keep yall posted on what caused it for sure after I get it out of the shop. That way if anyone else has this problem they will know some stuff to check. thanks for the helpful comments though!!

  • dan May 11, 2010

    how many miles are on this car? it sounds like a fuel problem to me.



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It definately sounds like a pats problem because of the lights... except for the "wouldnt run unless i floored it" problem. That sounds like a tuning problem. But, if its a pats problem, it will have a DTC code in the computer, it will say antitheft mismatch key or something similar to that. It very well could be a bad ground or wiring problem from whoever installed the engine

Posted on Jan 25, 2009

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The pats sys identifies your ignition key and then allows the engine to start, instead of disabling it what you should do is get another key made for you jeep by a jeep dealer and let them know that you need the key with the transponder built into it and make sure that you do not by pass the pats system probably that is the whole problem since the vehicle is unable to identify your key it is cutting off thinking that you are stealing your own vehicle!!!!.

Posted on Dec 07, 2008


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