ronpaulss Posted April 16, 2010 Report Share Posted April 16, 2010 I've been throwing a lean code on both banks (P0171 and P0174) for over a month now on my daily driver 2003 SSS. I stopped in my local Chevy dealer and fortunately found a very knowledgeable and helpful tech that has been trying to help me trouble shoot the problem in his "freetime" between jobs. So far, we've tried cleaning the MAF, replacing the MAF for a new stock [Delphi], spraying the intake manifold with BG intake cleaner (e.g. spray test), and downloading a software update for the PCM. The spray test showed no indication of a leak in the intake manifold. The test was performed while the engine was warm and I plan to redo the test when the engine is cold. All of the clamps on the Volant are tight. The diagnostic on the techs GM handheld is continuing to show both banks lean. O2 sensors are reading normal and so is the trucks other systems. The truck is running great with no noticeable issues. More info about the truck.... 116,000 orig. miles. Engine Mods are Volant CAI, Dyna Tech Headers, Magna Flow Exhaust, High Flow Cats, 180 Stat. Engine mods have been in for awhile (since the truck had around 14,000 miles). In addition, I've recently installed new Taylor 409 wires, and new AC Delco Iridium's Plugs. Just this week Wheatley programmed a tune and is on the way.... I'm completely stumped [and frustrated] on what could be causing the two lean codes. I would like to have the issue resolved before I receive and install the Wheatley tuned PCM. And, I have to take a 3,000+ mile trip with the truck next week and hate to do it with that check engine light glowing in my face! Any help and guidance would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
sonickoolten Posted April 16, 2010 Report Share Posted April 16, 2010 (edited) i was having the same problem but mine cleared once i cleaned the maf though been about a month with the light off....... got 60k miles on mine though and got the volant power core CAI Edited April 16, 2010 by 10zin (see edit history) Quote Link to comment Share on other sites More sharing options...
Cramer Posted April 16, 2010 Report Share Posted April 16, 2010 Did you check the fuel pressure? You might have a pump going bad and not giving it enough fuel or you could have a blockage in the fuel system. Try some sea foam or even injector cleaner. Quote Link to comment Share on other sites More sharing options...
SSplaytoy Posted April 16, 2010 Report Share Posted April 16, 2010 Could be a fueling problem or injector issue. Did the tech check any of that? Quote Link to comment Share on other sites More sharing options...
ronpaulss Posted April 16, 2010 Author Report Share Posted April 16, 2010 Could be a fueling problem or injector issue. Did the tech check any of that? The tech checked the fuel system including the fuel pump on his GM handheld and everything appears normal. I forgot to mention in my post that I've also run a fuel system cleaner (the stuff your pour into the gas tank). I'm going to try doing the spray test today while the engine is cold to see if I can find leak in the intake manifold. I'll post my findings.. Quote Link to comment Share on other sites More sharing options...
ronpaulss Posted April 16, 2010 Author Report Share Posted April 16, 2010 (edited) i was having the same problem but mine cleared once i cleaned the maf though been about a month with the light off....... got 60k miles on mine though and got the volant power core CAI I had originally thought that I may have over oiled the filter in the Volant and as a result had messed up the MAF. I considered switching to the power core because of it.. Is there any noticeable difference with the power core. I spoke with a rep from Volant and he mentioned a 3hp loss by switching to the power core. Edited April 16, 2010 by RonPaulSS (see edit history) Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted April 16, 2010 Report Share Posted April 16, 2010 The fuel pump and everything checks okay, but when was the last time you changed your fuel filter? Quote Link to comment Share on other sites More sharing options...
ronpaulss Posted April 16, 2010 Author Report Share Posted April 16, 2010 The fuel pump and everything checks okay, but when was the last time you changed your fuel filter? I bought the truck used so I don't know for sure but there is a good chance it's never been changed... Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted April 16, 2010 Report Share Posted April 16, 2010 I bought the truck used so I don't know for sure but there is a good chance it's never been changed... That is one place the dealer tech should have checked, a plugged fuel filter will starve the motor of fuel.... Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted April 16, 2010 Report Share Posted April 16, 2010 Pulled this from AllData, unfortunately you may have to get a bit deeper to find the problem.... DIAGNOSTIC AIDS •Excessive resistance in the fuel injector control and/or the ignition 1 voltage circuits may cause the following symptoms: •A lean condition •Misfire •Rough idle. Refer to DTC P0200. See: P0200 •The system may become lean if an injector is not suppling enough fuel. •A lean condition could be present during high fuel demand. Quote Link to comment Share on other sites More sharing options...
ronpaulss Posted April 16, 2010 Author Report Share Posted April 16, 2010 Pulled this from AllData, unfortunately you may have to get a bit deeper to find the problem.... DIAGNOSTIC AIDS •Excessive resistance in the fuel injector control and/or the ignition 1 voltage circuits may cause the following symptoms: •A lean condition •Misfire •Rough idle. Refer to DTC P0200. See: P0200 •The system may become lean if an injector is not suppling enough fuel. •A lean condition could be present during high fuel demand. This story comes to an end!! Moral of the day: Solutions are usually found in the simple things (at least that's my moral of the day)!! I took the truck back to the tech at the GM dealer and he was convinced it was an issue with the Volant CAI. So, he checked it up and down. He was right.... As it turns out, the part of the tube connected to the throttle body had separated from the rubber gasket. It wasn't visible because it separated at the bottom part of the tube. You could feel the gap when you ran your finger underneath but it wasn't visible from the top. Total rookie oversight. Truck is running outstanding and no more codes!!!!!! Can't wait to receive the tune from Wheatley. It shipped yesterday!! Thanks a lot for all of your help and thoughts. Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted April 16, 2010 Report Share Posted April 16, 2010 This story comes to an end!! Moral of the day: Solutions are usually found in the simple things (at least that's my moral of the day)!! I took the truck back to the tech at the GM dealer and he was convinced it was an issue with the Volant CAI. So, he checked it up and down. He was right.... As it turns out, the part of the tube connected to the throttle body had separated from the rubber gasket. It wasn't visible because it separated at the bottom part of the tube. You could feel the gap when you ran your finger underneath but it wasn't visible from the top. Total rookie oversight. Truck is running outstanding and no more codes!!!!!! Can't wait to receive the tune from Wheatley. It shipped yesterday!! Thanks a lot for all of your help and thoughts. Glad to hear you figured it out. Quote Link to comment Share on other sites More sharing options...
sonickoolten Posted April 16, 2010 Report Share Posted April 16, 2010 GOOD TO HEAR man atleast it was something easy maybe thats what was happening to mine cuz i took the powercore filter off and cleaned it real good and installed it back on...... Quote Link to comment Share on other sites More sharing options...
ronpaulss Posted April 17, 2010 Author Report Share Posted April 17, 2010 Glad to hear you figured it out. Me too! Quote Link to comment Share on other sites More sharing options...
ronpaulss Posted April 17, 2010 Author Report Share Posted April 17, 2010 GOOD TO HEAR man atleast it was something easy maybe thats what was happening to mine cuz i took the powercore filter off and cleaned it real good and installed it back on...... Thanks bud, it's always the simple things that getcha!! Quote Link to comment Share on other sites More sharing options...
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