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?