2013 V6 P0171 and P0174 lean codes, HELP!

[awdmofo]

2013, V6 6sp 85K miles with a CAI, ported stock TB ported intake manifold, manifold spacer and cat back exhaust with no resonators. No turbo/ SC or head work, basically stock with a few bolt ons. I bought it at 60K (2 years ago) miles and never had a CEL of any kind or P0171 & P0174 codes. I put on the ported intake manifold and about 50 miles of driving it pulls strong and works fine but the CEL came on and popped those codes. I double checked the hoses and whatnot, i've taken this part of the upper engine apart 2 times before with no CEL. I deleted the codes and drove 250 miles before they came back. I'm triple checking the connections and whatnot right now but lost for what else to check.

I clean the MAF every oil change, and i'm currently running chevron 91 because i'm supposed to get a tune at a local reputable Camaro shop. Just worried the tune won't fix the lean issue. Any help would be awesome!

[awdmofo]

No one has run into these codes before?

[spyderbuddy]

Not yet, I don't have ported heads yet

[awdmofo]

Originally Posted by spyderbuddy

Not yet, I don't have ported heads yet

Is that was supposed to cause these codes? I don't have ported heads either.

[ChibiBlackSheep]

Check out this link: http://ricksfreeautorepairadvice.com...4-gm-vehicles/

[awdmofo]

Chibi great advice as always! The foul hose they are referring to is the pch on top of the manifold right?

[ChibiBlackSheep]

Yeah, that's where you would have cut to install the catch can.

[awdmofo]

Originally Posted by ChibiBlackSheep

Yeah, that's where you would have cut to install the catch can.

The catch can actually sounded like it had a vac leak, I couldn't get it to go away so i removed it for 250 miles and the CEL still came back. So i' wondering if that hose isn't making a good seal on the top of the manifold.

[ChibiBlackSheep]

Yeah I would check for a vac leak there then. Did you replace it with a new factory un-cut hose?

[awdmofo]

Originally Posted by ChibiBlackSheep

Yeah I would check for a vac leak there then. Did you replace it with a new factory un-cut hose?

Not yet, ordering it now from a local Chevy store, gonna put it in tomorrow and make sure everything else is secure and not leaking then drive it for 200-300 miles before I bring it in for the dyno tune. Update to come shortly!

[spyderbuddy]

I didn't Know I was just trying to give you a bump.
Anyway Mine blew a Head Gasket January and has been down.

[spyderbuddy]

Ok, great little write up, we use to use carb cleaner to check for vacuum leaks.

[awdmofo]

Originally Posted by spyderbuddy

I didn't Know I was just trying to give you a bump.
Anyway Mine blew a Head Gasket January and has been down.

Oh, thought you were making a funny . Sorry to hear about the blown HG.

Replaced the line with a new uncut factory foul air hose. CEL came on within 20 miles . So my OBDII code reader i have is acting up so i can't get any fuel trims to test the purge valve... i Guess its cheaper to just buy one and replace it since the car has 85K miles on it, rather than spending $100+ hr on diag at a shop??

Wondering if 'm going to have to bite the bullet and bring it into a stealership

[ChibiBlackSheep]

The purge valve test was just putting your finger on it and seeing if you feel vacuum. Shouldn't be too tough of a test for you, without wasting the money of just buying it.

If you are planning on taking it into a dealership for diagnostics, you NEED to return it to stock first, everything. If this is vacuum related, they are going to take it apart piece-by-piece and run tests, and your diagnostics fee will be like 6+ hours.

So I would do the purge valve test first, if that passes, I would honestly remove the UIM spacer, and also check the whole UIM for cracks. Also buy a new gasket kit, I don't like to reuse those blue rubber ones.