I'm trying to fix the main issue. I think you and I both know that the tb shaft seals wouldn't be causing the sudden lean wot afrs.

 

Just throwing this out there, but since this all happened when you swapped your intake. Might be a good idea to try throwing some electronics parts wash on the maf (connector pins) and harness pins to clean them up and plug them back in. Electrical gremlins are a *****. Also inspect the harness to make sure the wires all look in good shape and that the plug is fully seated in the MAF when your done.

 

If the car is dual maps, are you sure you aren't on the wrong map?

 

Positive

 

maybe check your injectors for the infamous black gunk, have you been only using e85 for a long period? do they change blends for winter where you are? either could cause running lean and then detination . going wot in the 13s is not a good thing

 

forgot to ask what kinda times did you make at the track if I can ask?

 

The injectors had been on e85 for about a year now. Also had them cleaned/flow tested about a month prior to my most recent tune which was in September I believe?

the car was having an un-related (i think?) bogging issue (another thread for that).. ran 12.6 @ 120mph. Was bogging for a split second at the bottom of 2nd, 3rd, 4th gear.

 

it wouldnt hurt to check your injectors again just incase, I had a set of precision 1000s gum up in just a couple months, that was a long time ago. ive been afraid to use e85 ever since

 

Went ahead and pulled them. Going to send them again for flow test and clean. Will report back.....

 

Injectors come back in tomorrow. Really hoping that will be the culprit

 

What this guy said. The problem started when you changed intakes so i would look for the problem here. Maybe as you were pulling the plug you half pulled out a pin and its not sitting as it should in the plug. Check the wiring around there etc.

 

Just to update. Having the injectors cleaned did not fix the problem.

 

Well took UICP off and checked every possible hose that I could. Had my entire arm under the intake mani just checking all of the EGR hoses, etc etc etc.. Found absolutely nothing. Checked little things like the MAF adapter gasket, etc. All good.

Since the injectors tested and flowed good, can rule that out.

Since the AFRs are perfect when cruising / idling, and only go lean under load... that, to me, points to fuel delivery... does it not? Wouldn't that make sense?

I'm thinking it may be a clogged / bad FPR?
Or could be something related to the fuel pump rewire my tuner did a while back... even though it ran perfect for over a month.

 

Still no fuel pressure gauge?

 

Wanted to update car is finally 100% back to normal.

Took it back to tuner and he said there were several boost leaks (we couldn't find the first time I guess?) and a couple leaks around the EGR (thought I looked that over pretty good?)

But nonetheless the car made great power and I'm a happy camper.

Thanks for all of the help