running rich at random times??

[ray666]

well...i thought i had all the bugs figured out. anyways the car will run fine at the start then run rich til it warms up. it will run fine for 10-15 mins then out of nowhere it will dump gas. then sometime later the a/f will be great again. i cleaned out the plugs which helped a little. i checked for boost leaks and everything is super tight. the injectors are huge 785cc, i checked for leaks there and nothing. i got it narrowed down to the maf or fpr. does anyone know if nismo fprs go bad? i noticed when the car is idling rich the fpr gauge is flicking back and forth. the maf wires got quick disconnect plugs, i guess i should solder that. any help would be awesome.

[Infinitiguy19]

I have seen fuel pump regulators go bad and I doubt one brand makes them better than any other.

Solder the MAF correctly and see what that yields.

[ray666]

i'll solder the wires tonight. i have a nagging feeling its something sooo simple.

[ray666]

soldered the wires still the same...

[ray666]

i've been looking around about bad fprs. should there always be constant pressure when the car is off? i have a nismo fpr and with the overly large injectors, i keep pressure between 25-30 psi. i have my plugs gapped at .027, maybe bring it down to .025?
Modified by ray666 at 11:20 AM 4/10/2010

[ray666]

update i clean the plugs and regapped to .026 car runs a whole lot better. not sure if thats just a band aid to another problem.

UPDATE DAY AFTER- car is still running good i think i fixed the problem!thanks to no one

Modified by ray666 at 11:47 AM 4/11/2010
Modified by ray666 at 11:49 AM 4/11/2010