Problems going lean.. PLEASE help!

[kjzstealth]

Are you running stock 9b's? What are you using for fuel management? Might want to check and make sure your settings on it are the same as they were when it was running good.

Also as stated, knowing what kind of FP your dealing with would help you out a lot.

Yes I am on 9b's. I have a set of 15g's but I want to get it running correctly before I install them. I am using an Apexi AFC Neo, and it is supposed to be the updated one to work correctly. Actually at first when it was running so good I had it set at 0 correction but now I have turned it up as high as 25% in the ~3k range to try to get the fuel there but it just isn't happening. BTW I also still have stock injectors

[elyria_boy]

Any update on this? I have similar problem.

[kjzstealth]

No, I have not had the funds to do much at the moment but I am going to try to get a FPR from a known running good car. I was going to just change my injectors but I found out one of my DSM 450''s was bad.. Was going to hook my logger up and find out which one but my batteries had gone dead and I couldn't find my USB to serial converter. Ugh!!! I have a new one on the way and I will probably buy a reman injector instead of waiting on someone to ship me a single.

As of now I am about fed up with it. I just want it to run right.

[Austin@STM]

Also look into the sensors the vac hose runs to from the FPR, those go bad sometimes to. If you already got rid of the make sure the vaccuum line isnt kinked or leaking at higher pressure.

[kjzstealth]

thanks, will check that too. I have done the vacuum reduction but I will double check my lines. I know they are still in place but I need to do a leak test anyway. It starts having problems as low as 5-7psi

[Mean Green]

Compression test.

[kjzstealth]

Just an update: It was my factory fuel pressure regulator that had failed. It ran great at idle and even low throttle but ran ~13.0:1 AFR under boost. Now it drops to 10,0-11.2:1 under boost.

As a side note, anyone know what a good AFR at WOT should be? My logger batteries died and I can not for the life of me find my serial adapter to reload MMCD on my Palm, so I am looking for a safe AFR to run until I can tune it better.

Thanks,
Kelly J.