DrieStone Posted March 27, 2014 Share Posted March 27, 2014 I just got my LGT and I bought a handful of parts including a Cobb tuner. I flashed the Stage 1 91 octane, and the car started acting odd at idle (runs really rough). I returned it to stock, and it continued to have the issue. After reflashing the stage 1 (and some driving), I got a CE light, with a P0171, P0304-P0301, and a PFFFE. My fuel trim is +25%. The car runs fine under load, but idle is really rough (it was actually stalling on occasion so I increased idle +300 rpm for now). After some research, I think the increased boost with stage 1 blew a hose somewhere and now I have a vacuum leak. I could hear a hiss coming from under the intake manifold. When I sprayed some starter fluid in there the idle would improve. I tugged on the vacuum lines but everything seems to be attached. I'm a little confused as to what could be the line that I'm having issue with. At first I thought it was the wastegate solenoid (spraying there improves idle), but I think it's something behind it. There are two larger hoses on the backside of the manifold that when sprayed also made a difference. What else is under there that might be giving me a problem? I'm hesitant to remove the intake manifold to search for the problem, but I may remove the TMIC in my search. Link to comment Share on other sites More sharing options...
Con.Harr91 Posted March 27, 2014 Share Posted March 27, 2014 There is a blue T fitting that may have blew apart. You should be able to see it when looking between the intercooler and manifold. It's very easy to get to with the intercooler removed. '03 Forester X 5mt - Engine Seized at 262k miles. '05 LGT Wagon 6mt -MotoIQ.com Project Vehicle '13 VW Touareg TDI - Daily Torque Monster. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted March 27, 2014 Share Posted March 27, 2014 I could hear a hiss coming from under the intake manifold. When I sprayed some starter fluid in there the idle would improve. There is a blue T fitting that may have blew apart. You should be able to see it when looking between the intercooler and manifold. It's very easy to get to with the intercooler removed. +1. That should be exactly it. Check under the TMIC. You will most likely have the leak there. Make sure you zip tie everything. Happened to me twice. see->http://legacygt.com/forums/showthread.php/tiny-rubber-hose-came-off-lots-cel-codes-163556.html Link to comment Share on other sites More sharing options...
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