have tried everything,last hope,any advice. running lean red top sr

[driftiteasy0113]

hey guys i have searched like crazy and no answer.i am running lean out of boost and under boost its around (14-15.5 ish) at all times.i know this under boost is super lean. i have replace my fuel pump,fpr,switched out ecu's,checked fuel pressure and vacuum leaks and still doing this.my sr engine is completely stock.i have intercooler and piping 3" turbo back exhaust.i have the wideband hooked up through an o2 bung in the testpipe after the down pipe, and an apexi neo hooked up.is it bad to have my wide band hooked up at my test pipe o2 bung?is it too far away and giving a bad reading possibly?any way to possibly check the maf? please hit me up if you have had this problem or fixed it or if you have any input.i am running out of hope and need to fix this cause i am driving 300 miles on sunday and i dont wanna ruin my baby. thank you in advance guys

[motorboater]

anything to do with your apexi settings?

[driftiteasy0113]

anything to do with your apexi settings?

no im pretty sure its not i just have everything at zero so its stock map.

[driftiteasy0113]

bump!help me!!

[Portugese Bend]

I'm having a lean problem as well. It's driving me crazy.

I came across something in my search about a problem with the cat could cause problems running lean. As far as I know, I have the original one at 209,xxx miles. I dunno...

[driftiteasy0113]

eeeew, that sounds good but i dont have a cat haha, my test pipe is there and my wide band is hooked up in the test pipe....im really stumped on this. does anyone think a maf could cause this?

[Portugese Bend]

Oh, I missed that you're catless in your post.

One of the things I'll be checking is the voltage to the MAF and fuel pump based on what I've been reading.

[driftiteasy0113]

do you know should i just have 12volts with key on?for the maf and fuel pump?

[Portugese Bend]

Not sure. Check the FSM if you can but I've been reading this thread and here's what one guy said...

zer...power

"I checked battery voltage and ground straps on engine bay.Finally i decided to check voltage at fuel pump,it was low 12v.I went to auto part purchased 12 gauge wire bosch relay and connectors and a switch,I just finished wiring it up with switch on ground side of relay ,damn this thing starts right up now and voltage now at pump is 14+.also switch will completely disable pump ,added piece of mind.also no more pump whinning noise.one of the most over looked things to check is fuel pump voltage.check yours .hope this helps"

[driftiteasy0113]

thanks i will check the voltage. also i was checking ans my bov has a pressure leak at idle, i pinched the vaccuum line so it would close fully and it said even leaner on the wideband..... :/