Originally Posted by
razzer
I have corrected the high fuel pressure issue. I put the GT350 pump ( 100 psi, not sure why, since the stock GT350 pump spec is 53-75psi) back in, and added a vacuum controlled regulator. Vacuum pulled from intake where the dash gauge draws from. I re-installed the return line. Routing goes from the secondary fuel rail to the regulator, then to the tank. Since the ID1050x injectors are rated to be 43.5 psi injectors, I started at 43.5 psi on the regulator, then tried 50, 55, 60, 65, and 70. It doesn't seem to matter greatly on the pressure, it still isn't right. I am still getting a random idle, I see 2k, 1k, and some in between. I have logged and studied, but I don't really know what to look for. I did notice my injector DC varies from .7 up to 6.? at times. I thought DC should be more consistent around .8 to 1. something?
I scared to take it back to the tuner, because I think he will just say its not the tune again, and its a vacuum leak, or now something else. I can't afford to pay tuner rates for diagnostics. I got e return email from Roush, stating that their s/c kit (422001) does not require an inflated fuel pressure, and that is a stock "Ford spec'd" 53-63 psi. Is that maybe why their canned tuned are so mild?