240 lean AFR above 2.5k under load

[LtSlayer]

Guys I really am not sure what to try now, I'm going to try making the vacuum/boost leak tester to see if I really have a vacuum leak but it seems backwards. Wouldn't I run lean at low rpm and rich at higher rpm?

I've already replaced all the gaskets/vacuum lines and cleaned out the IACV. If I can't figure it out soon, I'm just going to do every semi reasonable thing in one shot. Replace every line in sight, try to source every hose possible, replace the IACV, Knock sensor, temp sensor, and maf.

Any other ideas? I just want my car back

any chance it could be my ECU?

Thank you

[ajracing9]

Hey dude, had the same issue but i didnt have an air flow meter. my car lagged, it felt like it would take forever to build boost. i got an afm and did a boost leak test and found a crack in the intercooler, fixed it. I did new plugs then i got and adjustable fpr and it kinda helped.. but then i read somewhere that fuel pump failure is not usually just it stops working, it gets "lazy" looses pressure under boost. I got a 255 lph walbro from enjuku racing. its like a 20 minute fix. totally worth it! hope it helps

[LtSlayer]

My car is in limp mode so I’ll likely have to replace a sensor or wiring. I’m going to boost leak test as well and if that doesn’t fix it I’ll test everything including fuel pressure. I doubt it’s the fuel pump since I fixed everything besides idle before removing the intake side again. I think it’s a damaged or disconnected sensor combined with a vaccum leak. The car isn’t with me so I’ll post back when I find it.

[LtSlayer]

Solved. The MAF connector had a bad pin on the signal wire. I back proved it to test voltage and that somehow fixed everything . Good looks brothers