If you make changes to fueling and it doesnt change the wideband reading either you are having misfires, the wideband is wrong, or your fuel system is maxed out. Probably the last one.

 

Well the funny thing is, it was running perfect at 14psi. right at 11.4.11-7 and the IDC was around 78-79%. Now the IDC dropped to 67-68% and its running stupid lean. My fuel system consists of a1000, -8 feed, -6 return, rails, 80lb injectors and magnafuel boost referenced reg. I know it's not maxed out at 14 psi bc like I said it was running perfectly and now its not.

 

Just add some fuel and log. My part throttle leans out a bit in the winter and fattens up In The summer. Wot doesn't usually change by much though. Glad the new sensors working for you. The old sensor may have been off for a while and you didn't know. Also when is the last time you cal'd the wide band? I do mine every once in a while. It usually doesn't change much though.

 

Yea good thinking. Ill cal it before doing any more running.

 

I've had an lean issue like that before. Turned out I got some gas that was heavy on the ethanol content. I re-tuned it, then filled back up later, only to be really FAT! try filling it up with some fresh gas.

 

That could be. I get my fuel from the same shell station everytime and it could be that. Ill try one across town.

 

I'm pretty sure I found the problem. I have an inline 10 micron summit brand filter. Its been there since the build and has about 7500 miles on it. I tried blowing through the inlet and almost had an aneurism. Its pretty clogged up. I'm going to a speed shop today and getting a replacement.

 

Nice! Hope that's all it is.

 

If idc dropped its gonna be bad data from a sensor or tune related, not fuel supply.

 

Well replaced the filter and sure enough that was the problem. It gained 4 psi of pressure at idle! lol. So of course it was really fat so I leaned it up and Im good to go. IDC is right at 60% and it's running strong at 14psi, 13* and 11.5 AFR.