keeps going lean.

[Lil' Shaun]

My car keeps going lean if I have the rpm's at or above 3000 for any period of time. When its hot out side it is much worse. It doesn't matter if I'm cruisung or wide open it still does it. When it does it, it fels and sounds like it shuts off an injector. The wide band goes from reading normal to reading 18-19. If I hit the clutch and let the rpm's drop to idle and let off the clutch its fine again.
Just about everything on the engine is new.

 

[Colt4G63 also]

This happens to me too, and I tried two different ECUs so I know that's not it. Mainly if i'm going around 55-60 the short term fuel trim will max out at +17 for a while (AFRs still fine), but after a couple minutes if it remains steady at +17 it resets itself to zero and AFRs go lean off the scale.

The screwed up thing is that my car flows the exact same amount of air at 65 mph as it does at 55, but at 65 mph fuel trims are in the minus range.

 

[Lil' Shaun]

Mine does it real bad when its hot out. Yesterday it would do it as soon a the turbo started to spool. But not every time. and I can't take the car past 90mph because of it.

 

[GSTurbo1]

well dont try to make it past 90 if you are that lean. You are going to burn it up, If you have a fuel regulator turn it up some psi. You need to get this fixed or you are going to have problems

 

[Colt4G63 also]

That's different than what I have going on. It sounds like your ECU doen't know when to go into open loop mode. Make a log and look for a sensor reading that's out of whack.

If you can check fuel pressure while driving, that would be helpful too. Perhaps there's a boost refrence issue with your FPR. Try eliminating the FPR solenoid if you still have one.

 

[Lil' Shaun]

I'm using an aeromotive regulator with on silanoid. But it does it under boost or vacuum it doesn't. And its not like it slowly goes lean it will go straight from 10.8 to 19.

I don't have a way to log it either. I bought evoscan but can't get it to work

 

[Colt4G63 also]

Get link and post a log with that.

 

[Lil' Shaun]

I want to but I can't afford link or a new ecu for it. I tried running an evo 8 apexi powerfc d-jetro but the car ran really funny with it.

 

[Lil' Shaun]

Could it be because I'm not running a map sensor?