Nochance Posted January 23, 2011 Share Posted January 23, 2011 I've got a 2005 GT Limited, stage 2. One engine code is because I'm missing a sensor, the other is because of the MAF. I think like 1102, 1013 or something like that, didn't right them down. Anyways, the car starts up but idles really rough and stalls unless I give it a lot of gas then it's ok. I unplugged the MAF and the car runs like new. The sensor doesn't look dirty. Think it's a bad MAF? Link to comment Share on other sites More sharing options...
John M Posted January 23, 2011 Share Posted January 23, 2011 If you unplug the MAF and the car runs well, it means there's a leak. There's a small chance that the MAF sensor itself is bad but the odds are 99.99% that it's a leak. Since it affects idle I'll put my money on a vacuum hose. Check the notorious T under the intercooler and all the other vac hoses you can find. You may be able to hear the leak while the engine idles. Link to comment Share on other sites More sharing options...
The Murdocta Posted March 2, 2011 Share Posted March 2, 2011 My friend has a similar problem with his. At stage 2 with the MAF sensor plugged in, the car will start and instantly stall. When you unplug the MAF it will run, but really crappy. We put it down to Stage 1 for the time being and it seems to run but only with the MAF unplugged. Another thing we can notice is that when you get on the throttle there is a ridiculous amount of "whooosh" noise like hes boosting at 30psi but doesn't get past like 10 psi on his gauge. He brought it to the Dealer who tightened small leaks in the Up and Down pipe and around the turbo as well as some "clamps". Needless to say after $570 of work, the problem is not fixed and were not really sure where to go. It could be the VAC hoses but im not even sure where they are all located. Any ideas? Will it Blend? That is the question! Link to comment Share on other sites More sharing options...
PearlBlueGT Posted March 4, 2011 Share Posted March 4, 2011 I would think you should be able to check it with multimeter (resistance) I can't find what specs range it should be. Link to comment Share on other sites More sharing options...
madcatz Posted March 4, 2011 Share Posted March 4, 2011 Did you install the maf backwards? -Travis Rob (rao) you're a fine gentleman, thanks I guess. Link to comment Share on other sites More sharing options...
Nochance Posted June 23, 2011 Author Share Posted June 23, 2011 Since the post, the problem subsided. But earlier this week it reared it's ugly head again. CEL keeps throwing a P0171 code. The car runs rough at idle, fluctuating RPMS, sounds like it's trying to leave the hood. I unplugged the MAF, set off a CEL, but the can runs smooth as silk. I plugged it back in, and it starts rough idling again. I purchased the MAF cleaner a few months back, but it's been a temporary fix. I'm bringing it to my mechanic tomorrow and have him test for leaks. Link to comment Share on other sites More sharing options...
I Donated Too sigmafour Posted June 27, 2011 I Donated Too Share Posted June 27, 2011 Today I had exactly the same error code and car is running very rough... I cleaned the MAF, pulled the cable and ran the car with MAF disconnected and then moved on to looking for vacuum leaks... a can of starter fluid and spray around suspect areas and if you hear the revs rise you're getting close... I found a hose that had come off using this technique... I suspect this was it all along but my CEL is still on because I played around with the MAF and need to either clear the ECU by removing the battery or wait for a few starts to see if it catches up... HOPEFULLY I haven't gone and busted the MAF by cleaning it... <shrugs> Link to comment Share on other sites More sharing options...
Nochance Posted June 28, 2011 Author Share Posted June 28, 2011 Usually after a few starts with the MAF plugged in the CEL goes away. It did with mine. I got side tracked, and I'm bringing the car in tomorrow. When will it end. Link to comment Share on other sites More sharing options...
rollo Posted June 29, 2011 Share Posted June 29, 2011 I've been getting P0171s (lean condition) for a while, only at very low idle though, and because it was circumstantial (and because all my other cars are in pieces and I need something to drive) I've been lazy and just drove it, thinking I'd get around to fixing it soon enough. The idle seemed a bit lower than it should be, but recently it got worse, and the car is stumbling to the point where it's throwing P301, 302, 303 and 304 (misfire for each cyl). It's fine on throttle, but the gas mileage does seem to have got even worse than usual. Now I think about it, I'm also getting the crazy "woosh" sound, much more than it should be.. I was thinking it's time for O2 sensors (it has 83k on it) but first I guess it's time to check the MAF and vac lines. Since a lean condition = too much air/not enough fuel, I guess a small vacuum leak could well cause that at idle when the engine needs the least air. The car is stock except for an exhaust. I'll let you guys know what I find. Link to comment Share on other sites More sharing options...
I Donated Too sigmafour Posted June 29, 2011 I Donated Too Share Posted June 29, 2011 the vacuum line that caused my P0171 (and for kicks I pulled it off again and the code came back fairly promptly!) was tiny but had a hell of a suck on it while it was off! I think the boost pressure blew it off in the first place. It definitely doesn't take much of a leak to upset the idle and cause all kinds of rough engine issues... and yes, after a few starts with the MAF reconnected the CEL went out and all started to behave again so I cleaned it for nothing but it was grubby so all for the best... Link to comment Share on other sites More sharing options...
bmx045 Posted June 30, 2011 Share Posted June 30, 2011 This is why a boost leak test can be extremely valuable. Link to comment Share on other sites More sharing options...
Nochance Posted June 30, 2011 Author Share Posted June 30, 2011 Sprayed around, nothing. Tested with an identical MAF, no improvement. Only thing left I have to do is check under the TMIC. I'm borrowing a set of tools tomorrow. Is this easy for a person that doesn't know squat? Looks like basic assembly, nothing outrageous. Is there a diagram, highlighting where to check? My mechanic is on vacation and wont be back until after the 4th. In to the unknown I go. Link to comment Share on other sites More sharing options...
bmx045 Posted June 30, 2011 Share Posted June 30, 2011 it's not difficult, 3 12mm bolts and 2 hose clamps, and it comes right out, reinstall in the reverse fashion. put a shop towel in the turbo so nothing falls in it while the IC is off Link to comment Share on other sites More sharing options...
madcatz Posted June 30, 2011 Share Posted June 30, 2011 http://legacygt.com/forums/showthread.php/parted-back-stock-have-idle-issues-w-video-164769.html is your idle something like mine? have you checked the TMIC to TB Hose? -Travis Rob (rao) you're a fine gentleman, thanks I guess. Link to comment Share on other sites More sharing options...
Nochance Posted July 1, 2011 Author Share Posted July 1, 2011 Ill have to check the video when I get home. But its got to be the same issue. IC comes off tomorrow. Link to comment Share on other sites More sharing options...
I Donated Too sigmafour Posted July 1, 2011 I Donated Too Share Posted July 1, 2011 that TMIC to TB hose can be a nuisance... this is what mine would keep doing but it was easily fixed... made a super whooshing sound though... http://www.sigmafour.net/lgt/tmictotb.jpg Link to comment Share on other sites More sharing options...
bmx045 Posted July 1, 2011 Share Posted July 1, 2011 that's disgusting. Link to comment Share on other sites More sharing options...
SBT Posted July 1, 2011 Share Posted July 1, 2011 ^^ That's the cheapo TB inlet hose that Subaru puts on these. Why they felt compelled to add ridiculously-engineered components and a 1-way-only configuration is beyond me. This hose is the bane of my existence at the moment. - Pro amore Dei et patriam et populum - Link to comment Share on other sites More sharing options...
Nochance Posted July 1, 2011 Author Share Posted July 1, 2011 Now I know what to look for lol. So even if it looks like a solid connection, check to make sure it's not damaged. Link to comment Share on other sites More sharing options...
Nochance Posted July 1, 2011 Author Share Posted July 1, 2011 Got the IC off, now where am I looking?? Link to comment Share on other sites More sharing options...
bmx045 Posted July 1, 2011 Share Posted July 1, 2011 Look for disconnected hoses or loose hoses like we already said Link to comment Share on other sites More sharing options...
Nochance Posted July 2, 2011 Author Share Posted July 2, 2011 Everything looks like a hose to me lol... Got the tube off. A small puddle of gunk inside, and what looks to be a crack or the way its made. http://imageshack.us/photo/my-images/202/img0004us.jpg/ http://imageshack.us/photo/my-images/810/img0003sk.jpg/ http://imageshack.us/photo/my-images/405/img0006nv.jpg/ http://imageshack.us/photo/my-images/834/img0005rwy.jpg/ Not sure if any of this is normal? Link to comment Share on other sites More sharing options...
bmx045 Posted July 2, 2011 Share Posted July 2, 2011 As long as the tube isnt split and air can get through its fine. The puddle is normal. Link to comment Share on other sites More sharing options...
Nochance Posted July 2, 2011 Author Share Posted July 2, 2011 Found the T connector, that's secure. Hose looks good. Where to now? Link to comment Share on other sites More sharing options...
bmx045 Posted July 2, 2011 Share Posted July 2, 2011 Id hold your hand but I'm not remotely close to you...hopefully someone close by can hold it for you. Link to comment Share on other sites More sharing options...
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