Hello everyone. I'm assembling a list of possibile scenarios that would cause a P0171 code in my MKIV.

I have a 1.8t with a lot of upgrades.

Intake, Exhaust, and FrankenTurbo kit (*drool*).

Car ran solid for about 20 minutes then threw the "Bank 1 Too Lean" at me and it sounds like it may have dummied up on me (can barely hear it boosting).

I briefly checked for any vacuum leaks but will need to check more exstensively. I'll be honest, I don't know a whole lot about where to check except the obvious places. I'm just hoping it isn't my new injectors.

Anywho, I've done the obvious checking for leaks, and I'm almost positive it isn't the MAF as I just upgraded it (came in the kit). Got a EuroJet FMIC, GIAC flash, Catback exhaust (maybe I should get a 3" turbo back? Too much airflow maybe freaking out my sensors?).

Was hoping you guys could link me a guide on checking my fuel pumps voltage, how to check for clogs in the fuel system, and any other insight if you have upgraded your turbo.

This kit is fairly new and I haven't talked to anyone who has it so I am turning to the internets for your help.

All advice is appreciated!!!

 

bump!