Dave's Evo X Build/The Life of Dave blog

[Murlo26]

Well with another 10% MAF, almost no change

Idle trims improved, they are almost spot on at 1.5%. However cruise, quickly maxed out at 12.5% and I can't even do partial throttle really without going lean, it quickly maxes out my wideband lean if I try to go more than like 10/15% throttle so something has got to be off...

I did check my fuel filter, even cleaned it off with some brake cleaner, it was pretty clean actually so the problem is else where.

I have two thoughts. One, my AFPR...are the AEM's known to have issues?

The second, my walboro 255 main pump. When my second pump kicks in (before on e85) the car goes stupid rich, like 10.0 AFR's. So it almost seems like my 255 isn't working well. Tempted to almost buy a new one as they are so cheap. I have had it for 3 years, but I am not sure how they fail.

Tomorrow night or saturday morning I will pull my assembly because I guess that could be a problem, maybe loose hose clamp, ripped hose or something strange is wrong is my only other thought.

My fuel system isn't that complicated and it seems to be only at low speeds I have the issue.