2003 Cobra - car shut off while driving the other day and after inspection found power at the pumps but no fuel pressure - order new Deatschwerks 340 lph pumps and a PPRV delete kit, after the pumps came in and the tank was dropped I found the fuel line was corroded and that was the problem but I had the new pumps so I put those in anyways. The car started and idled fine but would not go into boost at all, just cut out at 4,000rpms and I got a P0191 DTC for fuel rail pressure sensor range performance - I removed those pumps thinking they were too much flow for my setup and installed the factory flow rated fuel pumps which actually came with PPRV delete built in (Carter complete fuel pump hanger Part# P76130S) - I also changed out the fuel filter (motorcraft). Now I am getting a P0193 fault for fuel rail pressure sensor "a" circuit high. I replaced the fuel rail pressure sensor thinking it may have been damaged from the higher flow pumps but the code is still present, the code is actually there even with key on engine off. The sensor is getting 5v power, 5v signal, 0v ground. Frps shows 2.8v while engine idling. I am getting 39 psi on scanner and 29psi with mechanical gauge on fuel rail at idle as I should when its not acting up. Fuel pressure shoots to 60 and the voltage spikes to 5.1 after idling for a while and engine starts to run rough. I have driven it to monitor fuel pressure and performance and after driving around for 5-10mins the scanner shows a dip to as low as 18 and as high as 60 but it does seem to recover to 38-39 quickly and hasn't stalled but it won't always go into boost, I can get 14-15psi when leaning into it for a gear or two but then I will try to make another quick pull and boost gauge only pulls up to about 3psi. I don't want to keep driving it as it is clearly not good and don't want to hurt anything. I have checked for a vacuum leak but can't detect anything, I have wiggled the wires for the frps and other engine sensors with engine running but nothing changes, there is 5volts at the pin in the pcm for the frps. Hoping someone has heard of this problem before or can point me in the right direction.
Below are the mods on the car:
2003 Cobra
Stieg Stage 6 Ported Eaton
KB Boost a Pump wired pre-fpdm
MAF Extender
2.93 upper / 4# Lower
3.2" Alt Pulley
NGK TR6 gapped at 0.032
JLT RAI
MRT High Flow Cats
Below are the mods on the car:
2003 Cobra
Stieg Stage 6 Ported Eaton
KB Boost a Pump wired pre-fpdm
MAF Extender
2.93 upper / 4# Lower
3.2" Alt Pulley
NGK TR6 gapped at 0.032
JLT RAI
MRT High Flow Cats