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Well, my car doesn't seem to want to cooperate with me much this year.
I just added an EXP90 kit, and a few other goodies this winter, and ever since the first startup it has been running super rich.
I eventually got my hands on Nissan Datascan, which helped me see that my Airflow readings were too high. I replaced one of my MAFS, and that seemed to take care of a good portion of the problem.The car is now drivable and seems to run well, but is still running really rich. At idle my AFR is somewhere around 12, maybe into the 13's. Cruising it is routinely in the 10's and dips into the 9's...
The only thing I've noticed is that my fuel pressure sits at or a little above 40lbs with the vacuum connected at idle. with the vacuum hose disconnected it jumps to about 50 or more. That tells me that the FPR is still working properly, but somehow is still giving me too much pressure.
I also have a spare FPR that I swapped in before with no change. I've blown some air through the return line with the gas cap off, and it seems to be clear and flowing well. I've been thinking about just getting an adjustable FRP and setting it back to stock spec, but I don't want to just cover up the underlying cause. Anyone ever see a problem like this?
I found a few similar cases in the search, but nothing that had been resolved.
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