Aex1 Posted March 14, 2012 Share Posted March 14, 2012 Hi, guys! It seems i have a real problem with my subby. After a winter i decided to check it with LV and was unpleasantly:confused: suprised by all those negatives at A-D+. Ok, using Dweeb method, i corrected MAF scale subtracting some percents. Then after 2 days (the temperature was the same) i checked it again... well, the negatives were all the same! Hmm, i drove, i checked, i correct them again (down). Ok, after some drive i saw LV and what?.. A-D+ remained all negatives! Like this: http://86.r.photoshare.ru/00865/00840acceb5c45fd77f92b2ee1efb14175fec9fa.jpg But i've already subtracted 6-8% from stock values at that CL area and my MAF is stock! Ok, i drove again with RR and obtained these results: http://86.r.photoshare.ru/00865/00840ad32b866a67d15a01907663928a050c5bba.jpg Original line, all down from 0: http://86.r.photoshare.ru/00865/00840ad2e586cae8ddefcce0c91b89abb54abe7d.jpg Now what? If i'll subtract another 5% from the previous MAF scale, already reduced, i'll got the difference from the stock maf scale around -10-15% somewhere! And it's not normal! I can't reduce my maf scale permanently! It's very similar to leak somewhere, but i checked everything, nothing... What do you think, guys? Thank you. (If you have difficulties by viewing the pictures, i can upload them from another site.) P.S. Don't pay much attention to the left curve, it's due to one random point on the left. I'm more concerned about the right curve, is it normal that descent down? I have FMIC. Link to comment Share on other sites More sharing options...
mwiener2 Posted March 14, 2012 Share Posted March 14, 2012 might have an actual problem.... like a leak My Mods List (Updated 8/22/17) 2005 Outback FMT Running on Electrons Link to comment Share on other sites More sharing options...
Aex1 Posted March 15, 2012 Author Share Posted March 15, 2012 might have an actual problem.... like a leak Yes, it seems to be... Thanks. But no one else had similar problem? Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted March 15, 2012 Mega Users Share Posted March 15, 2012 I think you are trying to correct a mechanical problem by tuning for it, ie. chasing your tail. Find the leak and then start over. Link to comment Share on other sites More sharing options...
Aex1 Posted March 15, 2012 Author Share Posted March 15, 2012 Ok, thank you, seabass07. Let's look for the leak again... You know, when it was very cold, my LV look almost ideal, after long day drive: http://86.r.photoshare.ru/00865/00840b7214c1b22b7f6c31d9f99475bdbe785774.jpg Does the temperature makes such a difference? Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted March 15, 2012 Mega Users Share Posted March 15, 2012 It shouldnt make that much difference. Are you on a stock intake? My immediate thought is that you are leaking metered air so the ecu is reducing fueling. Any other mods? Link to comment Share on other sites More sharing options...
rtbrjason Posted March 15, 2012 Share Posted March 15, 2012 Did you mess with your airbox/airfilter recently? Not getting the box lined back up exactly right can cause that issue with the negative values. I would start by putting the MAF back to stock (assuming it was stock before you started subtracting), Remove the air filter and inspect it for blockage, Reseat the air filter in the box and make sure everything is tight/look for any obvious vacuum leaks. Reset the ECU and go for a ride and post another LV. Link to comment Share on other sites More sharing options...
Aex1 Posted March 15, 2012 Author Share Posted March 15, 2012 Ok, thank you, guys! (Seabass07, you have the same car, i saw it! ) Guys, you are completely right, and i know what you are saying. Last outumn it happened, at one unknown service they put me non original airfilter and they put it wrong way. The result you can see below: http://86.r.photoshare.ru/00865/008413f37cdba61acf2d7f2312c5306bd6bfa52d.jpg Did you see such LV before? But then i felt it inmediately and corrected it right away. As you can see, i have the whole history of my car:), and here the situation is not such obvious... Ok, i'll check airfilter, first of all. Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted March 15, 2012 Mega Users Share Posted March 15, 2012 You might want to clean your maf sensor as well. Maybe check your intercooler for leaks. Look at the seam on the turbo side where the plastic meets the metal for oil seepage. Link to comment Share on other sites More sharing options...
Aex1 Posted March 18, 2012 Author Share Posted March 18, 2012 You might want to clean your maf sensor as well. Maybe check your intercooler for leaks. Look at the seam on the turbo side where the plastic meets the metal for oil seepage. Seabass07, thanks for the hints. I'll inform the forum about the results. Link to comment Share on other sites More sharing options...
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