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 Post subject: Running Lean
PostPosted: Wed Aug 12, 2009 10:22 pm 
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The Peace Maker
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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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 Post subject: Re: Running Lean
PostPosted: Wed Aug 12, 2009 10:48 pm 
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Classic case of a vacuum leak,

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 Post subject: Re: Running Lean
PostPosted: Sun Apr 17, 2011 3:00 pm 
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did you find out what it is cause im having the same issue


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 Post subject: Re: Running Lean
PostPosted: Sun Apr 17, 2011 4:19 pm 
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The Peace Maker
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sca555 wrote:
did you find out what it is cause im having the same issue


Vacuum leak.

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14.07@ 98.85mph 2.180 60'


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 Post subject: Re: Running Lean
PostPosted: Sun Apr 17, 2011 4:30 pm 
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where at


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 Post subject: Re: Running Lean
PostPosted: Sun Apr 17, 2011 11:29 pm 
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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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 Post subject: Re: Running Lean
PostPosted: Sat Apr 30, 2011 1:13 am 
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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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 Post subject: Re: Running Lean
PostPosted: Sat Apr 30, 2011 1:18 am 
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It could really be anywhere.

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 Post subject: Re: Running Lean
PostPosted: Mon May 02, 2011 2:48 am 
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Would an exhaust leak effect it?

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And still Working its way up.... :twisted:


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 Post subject: Re: Running Lean
PostPosted: Mon May 02, 2011 4:54 pm 
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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'


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