squashman702

Looking for some help with my E36 M3, car has an LS1 out of a 1999 Corvette, modified stock Corvette harness and a Current Performance relay box. I just got the car finished enough to run and drive around last week. Fuel system is an Aeromotive 340 pump, stock BMW lines to a C5 regulator, 6AN to the stock rails. Fuel pressure at the rail measures 78 psi, which seems higher than what the regulator should be allowing.

Car appears to be running very rich to the point where it seems like the engine is flooding. It will run okay for a bit, then start to bog. Pulled the plug on cylinder 1 and it was very dark and slightly wet. Had a P1635 code, checked 5v reference at the MAP, oil pressure, and fuel tank pressure, and all checked out- I did not have A/C flashed out of the PCM when I got my base tune, and I'm guessing this code is lingering because I do not have the A/C nor the pressure sensor set up. I checked O2 sensors, and unplugging the sensors does not change how the car runs, nor does it trigger a CEL. Measuring the wires on the harness side with a voltmeter shows both the tan and purple wires putting out 4.6-4.9v. I unpinned one of the tan wires at the PCM and checked again with key on power, and the voltage disappeared.

Any thoughts? Here's a picture of the plug for your viewing pleasure:

1964SS

iTrader: (1)

78 psi at the rail is too high. How is the regulator installed? I've seen a lot of incorrect information on the internet regarding the output and return so it's easy to hook up wrong.

squashman702

I'll double check that, 78 PSI seemed way high to me as well.

TipsyMcStagger

iTrader: (1)

In my notes, I've have written that regardless of how the supply and return are physically oriented on the filer/regulator, 3/8" is the SUPPLY from the tank and 5/16" is the RETURN to tank.

Tipsy

Michael Yount

iTrader: (1)

Reg should be controlling things to about 58-60 psig. Get that squared away before you start chasing other stuff....