G5892 Posted April 11, 2013 Share Posted April 11, 2013 Let me know how this turns out! I've been having the same problems. I did a smoke test today and found nothing, so wondering if its the AF sensor too. Link to comment Share on other sites More sharing options...
Tehnation Posted April 12, 2013 Author Share Posted April 12, 2013 I hope its this as well, have school and work atm, waiting for the weekend to get back under car. lets recap -horrible gas mileage -lv says fuel trim is lean, or is dumping lots of fuel rather to compensate for higher air readings/leak. -tested for leaks found and fixed them all. -cleaned maf sensor with maf cleaner Car still runs strong, so I guess if I change it and it fixes it, those listed above would be how to spot a bad front O2 sensor. Link to comment Share on other sites More sharing options...
Tehnation Posted April 14, 2013 Author Share Posted April 14, 2013 Didnt fix the problem... the saga continues. Idle trim still shoots to 15 and eventually a system to lean code comes up. Link to comment Share on other sites More sharing options...
Tehnation Posted April 14, 2013 Author Share Posted April 14, 2013 Any ideas what to log so I can show someone whats going on? Maybe somebody could help if they had some more info. Link to comment Share on other sites More sharing options...
Tehnation Posted April 14, 2013 Author Share Posted April 14, 2013 Maf sensor? Link to comment Share on other sites More sharing options...
Tehnation Posted April 27, 2013 Author Share Posted April 27, 2013 Changed maf and nothing. Changed rear O2 sensor and my idle trim is now at 3. Lets hope it stays there. Anyone heard of rear O2 sensor causing issues like these? Link to comment Share on other sites More sharing options...
ibr_adam09 Posted April 28, 2013 Share Posted April 28, 2013 Rear o2 does nothing but verify that your cat-converter works. I just got tuned and I have something fishy with my LV is near pegged at -15 in A cell. I replaced my o2 sensor a few months ago and cleaned maf before tune. Thinking I have a defective o2 sensor. Link to comment Share on other sites More sharing options...
Moderators BarManBean Posted April 28, 2013 Moderators Share Posted April 28, 2013 I'm fighting with this at the moment also. No other symptoms that I can discern other than the high idle fuel trim in cell A. I had a leak at the BPV, but believe it's fixed now and it still seems to be having the same issue. PITA. "Bullet-proof" your OEM TMIC! <<Buy your kit here>> Not currently in stock Link to comment Share on other sites More sharing options...
BrandonspecB Posted April 28, 2013 Share Posted April 28, 2013 Rear o2 does have an effect on fueling. http://www.romraider.com/forum/viewtopic.php?f=15&t=3588 I found this out after thinking I could use the rear o2 bung for my wideband since I don't have a cat. I soon realized with my newly installed wideband that my AFRs were way richer than the 14.7 it should be in closed loop. Live and learn I guess. Out came the DP and in went a new bung for the wideband. Link to comment Share on other sites More sharing options...
Tehnation Posted April 28, 2013 Author Share Posted April 28, 2013 I'm away on vacation, so I wont be able to take the car out until next monday, hopefully when I get back and drive it for 15 minutes I will have a proper lv. I was under the same assumption that the rear o2 did nothing, but I had a brand new one laying around so I thought it cant hurt. Normally my idle trim shoots up to 15 without even having to move the car, but its just sitting at 3 for now. Hopefully this solves everything because I know a lot of people are having this issue. I'm sure pretty sure most people on this forum state that the rear o2 does not effect fuel trim so this will be a good test. Link to comment Share on other sites More sharing options...
Tehnation Posted April 28, 2013 Author Share Posted April 28, 2013 I was getting a p0171 i believe, whichever is for running lean. My gas mileage is absolute garbage, and my sensors where blackened, I dont even know where to begin with this nightmare. Are you guys having these same symptoms? Link to comment Share on other sites More sharing options...
ibr_adam09 Posted April 28, 2013 Share Posted April 28, 2013 I threw a P0172 long ago which was the start of it all . But that's a rich code. You said you replaced your REAR o2 sensor and currently your fuel trims are dialed down ? I might look into that. Link to comment Share on other sites More sharing options...
Tehnation Posted May 7, 2013 Author Share Posted May 7, 2013 changed rear 02 and nothing still. Ordering new tgv to cylinder head gaskets, thats the last place to look. Link to comment Share on other sites More sharing options...
Tehnation Posted May 10, 2013 Author Share Posted May 10, 2013 WTF I fixed a leaking uppipe/exhaust manifold gasket. Got my boost back on track and then a couple hours later its got no power under boost...... and I have a misfire cylinder 3 memorized code.... could it be that my tgv gaskets are getting worse or is this an entirely different problem. Any ideas? Link to comment Share on other sites More sharing options...
Moderators BarManBean Posted May 10, 2013 Moderators Share Posted May 10, 2013 FWIW, my high idle fuel trim seems to be fixed. The culprit ended up being an aftermarket panel filter that didn't seem to allow the airbox to seal completely. Odd since it's pre-MAF and since I've used the same filter previously for thousands of miles. Anyway, nothing else made a difference and going back to a stock paper filter definitely fixes the issue. "Bullet-proof" your OEM TMIC! <<Buy your kit here>> Not currently in stock Link to comment Share on other sites More sharing options...
Tehnation Posted May 10, 2013 Author Share Posted May 10, 2013 Changing top and bottom tgv gaskets tommorrow. The no boost issue is gone, I reset ecu this morning and when I drove the problem was gone..... Link to comment Share on other sites More sharing options...
Tehnation Posted May 12, 2013 Author Share Posted May 12, 2013 Changed both tgv gaskets and spark plugs. Now my idle trim shoots to 15 right away after ecu reset before it took some time ..... sigh. I have no idea whats going on at this point. Now im guessing turbo maybe intercooler. Im pretty close to throwing a wrench through my windshield..... Link to comment Share on other sites More sharing options...
Tehnation Posted May 13, 2013 Author Share Posted May 13, 2013 After some research it may be my fuel injectors, guess its time to go big. http://www.romraider.com/forum/viewtopic.php?f=33&t=7202 From reading that article, I gathered that if it only effects idle or AF Learning #1 A then it may not be a leak. So i'll just keep saving and buying better parts until it goes away... not such a bad strategy. For now i'm going to get the dw 65cc fuel pump and 740 or 850cc fuel injectors for possibility of e85. If that doesnt fix it then I'll change turbo to something like a td06 20g. Link to comment Share on other sites More sharing options...
Tehnation Posted May 14, 2013 Author Share Posted May 14, 2013 Going to send my injectors to witchhunter.com have them cleaned and modded to 800+cc. 200 bucks... why not. Link to comment Share on other sites More sharing options...
ibr_adam09 Posted May 14, 2013 Share Posted May 14, 2013 would love to know how that goes. what'll be driving in the mean time ? Link to comment Share on other sites More sharing options...
Tehnation Posted May 14, 2013 Author Share Posted May 14, 2013 Going to go to junkyard and get a set for about 100 bucks, swap mine out for those to see if anything changes, and while I have the junkyard set in I will send my current injectors away to get cleaned and modded. That way no downtime, I'll have 2 sets of injectors and it will only cost me around 325 , 100 for used injectors and 200 for them to be modded and cleaned and 25 for shipping or less. Link to comment Share on other sites More sharing options...
ibr_adam09 Posted May 14, 2013 Share Posted May 14, 2013 Oh smart idea. Think you'll find used injectors that'll fit the legacy ? Link to comment Share on other sites More sharing options...
Tehnation Posted May 14, 2013 Author Share Posted May 14, 2013 Already did! Expect to pay between 100-150 tops for full set. You want a complete set or all from the same car so they have similar flow rates. Link to comment Share on other sites More sharing options...
Tehnation Posted May 14, 2013 Author Share Posted May 14, 2013 yea the dw65c Link to comment Share on other sites More sharing options...
Tehnation Posted May 15, 2013 Author Share Posted May 15, 2013 ahhhh my fuel trim has gone down.... OMG. Its now sitting at 10... thats progress in my book. so its something like 10, .10, 5, -1.5 for my trims. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.