kashmerekitty

I had the same code, and tried new cleaning MAF, new MAF, new car battery (I know but it was recommended somewhere), and still had no fix. It wasn't until I got on to the vacuum leak bus that it all came together. I'm pretty sure this is a design flaw in the TGVs. It's more than a weekend repair too. Took 15+ hours total to diagnose, and remove all parts to get to the offending area. I took advantage and replaced the injector seals, and spark plugs while I had the TGV, intake and everything else off the car. It's such a small leak that I didn't notice the issue until it was 35 degrees or below. The car never fully stalled, but ran really rough in the early mornings, or until the car was very warm! Good luck I hope you get it fixed.

The black seal should be pushed back in wish I had taken a pic of them how they should look before and after the fix but neglected too. Sent from my iPhone using Tapatalk

Great write up but those aren't the only issue with rough idle. The TGV valve pushes it's seal out between the rod and back plate that controls the butterfly valves. We fixed that with a plat of aluminum tube to keep them in place. Not a hint of idle issues now!! Replaced those orange gaskets/rings too while in there. Old ones are hard and can leak too. http://uploads.tapatalk-cdn.com/20160319/3a4eeb176efb990105a38fd73ce5d3d4.jpg Sent from my iPhone using Tapatalk

Sorry pic 1 is intake on the car and pic 2 is the seal that pops out causing vacuum leak and system too lean CEL. Sent from my iPhone using Tapatalk

Found the issue for rough idle. It will happen more in the cold for this issue. First, put a fog machine on to detect the leak spot. Found it coming from the passenger side of the intake manifold. We determined it was actually coming from the TGV. To get to that or anything really the IM had to come off. Discovered seals that when out under boost pressure pop out and cause the small leak and rough idle. We used aluminum tube to make a spacer to fill in the empty space between the seals and back plate. Put it all back together after a soda blast to clean carbon on the top and remove old IM gasket. I also replaced the TGV gaskets (orange), fuel injector seals, and plugs at this time as it was easier to access with the IM off. Put her all back together and after losing some coolant as had to remove the coolant rez (messy) and fired it up!! No more rough idle until a vacuum hose from the intercooler to the intake popped off a month later (probable from being loosened up after being removed twice to replace the turbo due to the banjo bolt issue and then this issue). Put two small nose clamps on both ends of that hose and no more issues!! Feel like I have a little more power at a lower speeds now too!! Hope this helps someone else it was quite a job but without labor only cost me the price of TGV gaskets, manifold gasket, and if you want while under there plugs and injector seals. 60k on car at this time 2008 legacy 2.5 GT. pic 1 shows the black seal that pops out. Unless gap is filled would have come out again after reinstall and boost pressure applied. http://uploads.tapatalk-cdn.com/20160319/5801ea64c4521db5644a4c41691f6651.jpg Pic 2 intake manifold on he car while we were disconnecting everything. http://uploads.tapatalk-cdn.com/20160319/af62c5357cb95def081a1d6a611ad403.jpg Pic 3 IM off the car tape is mostly showing areas that we disconnected. http://uploads.tapatalk-cdn.com/20160319/6f1632165ed150bcf6f306cff2bbc2c1.jpg Pic 4 IM Off looking at bottom with TGV on this is the part we soda blasted. Engine side manifold gasket had to be painstakingly removed with potent gasket remover and Popsicle sticks to avoid scratching. http://uploads.tapatalk-cdn.com/20160319/e860d43e26b9ade175a523fd253fde3e.jpg Thanks. Loving my second Subie again!! Hope this helps someone. Sent from my iPhone using Tapatalk