I haven't had to tune the car in the last couple of years. My tune always stayed right around -3 to 0 while criusing and locked in at 0 at WOT. Well last week I got my tuner back from RidinOnChrome to make sure my DTC's were clear before I got it inspected. Well I found a code I've never gotten before.

DTC P0171
Fuel Trim System Lean

I did a little scanning and sure enough, my LTFT's are staying around +16 while cruising. It still locks in at 0 on WOT, however, I'm getting 7*KR because of the lack of fuel before the PE kicks in. My IAC position is in the 60's. IIRC, it used to be in the 20's.

The car idles smooth whether or not the MAF in plugged. Same thing with the MAP. I'm thinking vacuum leak. I need to get some carb cleaner and check for leaks.

Any other ideas of what the problem could be? I've gotten a bit rusty at tuning.

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3.5" MPS, 1.84 Rockers, 3" DP, Frt PEM, 39lb Injs., PowrTuner, Wizair
14.07@ 98.85mph 2.180 60'

Classic case of a vacuum leak,

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Self made, not daddy paid.

did you find out what it is cause im having the same issue

Vacuum leak.

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3.5" MPS, 1.84 Rockers, 3" DP, Frt PEM, 39lb Injs., PowrTuner, Wizair
14.07@ 98.85mph 2.180 60'

where at

crap dude it's highly unlikely that you're going to have a leak in the same spot The Blackwood did. Just get some carb cleaner and spray it around the engine bay, when the idle changes you found the leak.

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

so the vacuum leak is it around the boost hoses usually or it could be anywhere? because im also havin the same problem!

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

It could really be anywhere.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

Would an exhaust leak effect it?

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

The diaphragm in my boost bypass valve was busted.

post288204.html?hilit=boost#p288204

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3.5" MPS, 1.84 Rockers, 3" DP, Frt PEM, 39lb Injs., PowrTuner, Wizair
14.07@ 98.85mph 2.180 60'