2003 Mach 1 Starts Then Stalls 5 Seconds Later - Mustang Evolution

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Old 06-01-2014, 08:53 AM   #1
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Question 2003 Mach 1 Starts Then Stalls 5 Seconds Later

Hi Folks,

I just recently purchased a Procharged Mach 1 and I'm having a bit of trouble .

The car began to cut out when hitting bumps. Sometimes from a cold start it would fire up no problem... sometimes it wouldn't and you just wait for a bit and it'd then fire up.

I went ahead, dropped the tank and changed the fuel pump(old/new were Aeromotive 340LPH). After doing this the car starts every time, but only runs for about 5 seconds and cuts out. It starts fine, idles at about 1000RPM then sputters out.

The computer now reports P0190 "Fuel Rail Pressure Sensor Circuit Malfunction". After doing some reading I find that folks like to replace the FRPS(Fuel Rail Pressure Sensor) when seeing this code. Seems that the diaphragm has a tendency to blow out under boost applications. I ran to the local auto parts store and picked one up. I popped that into the fuel rail and experienced the same behavior. I checked Vref at the FRPS connector. It's a steady 5.02v at Key On Engine Off state. I used instructions found in this thread: here

I went ahead and changed the fuel filter as that's cheap and easy... no change in behavior.

A friend had an extra FPDM (Fuel Pump Driver Module) so I swapped that, no change in behavior.

I inspected the inertia switch and observed that it had not activated. I figure the car wouldn't start at all if the switch was activated.

I inspected the fuse panel under the hood, all looks good there.

I've seen some talk about replacing the o2 sensors, but I'm a bit hesitate to keep throwing parts at it with taking a more educated approach.

I'm sort of at a loss. Does anyone have suggestions?
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Old 06-01-2014, 05:11 PM   #2
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Have you tried cleaning the Idle Air Control valve. That's cheap and easy to check, also maybe MAF?? Sorry not to much help, sounds like you've done a lot of troubleshooting. Didn't see these mentioned which is why I threw them out there

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Old 06-02-2014, 08:56 AM   #3
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Found the problem. Looks like Aeromotive switched the polarity on the new revisions of the 11142 model! The pump was going backwards the whole time!

Flipped the pins in the connector and fired up! Hope this helps someone.
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