High Idle Fuel Trim

Ive been looking all over for vacuum leaks, found one but my learning view still pegs at 15, any ideas??

Car runs and pulls fine. Anyway to get turbo inlet hose out and in without removing intake manifold?

Wish my car had a face so I could punch it.....

I recommend plugging the FIRST nipple on the turbo inlet and leaving the rest on. Then pressurize the system and check for leaks. Just dont go crazy with 15+psi(do 10 at most.)

 

Ive been chasing down a vacuum leak for about 2 weeks now :/

Tried something like that, and found one hose, but after that nothing. Will be replacing intake manifold gaskets when I remove it to inspect turbo inlet hose.

Ok good luck, i also found one breather hose that leaked and now no leaks, holds pressure but still messed up fuel trims.

 

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... Everything was fine. Cant seem to find this leak, its supposedly a big one. But I cant find it anywhere. Anyone any ideas? Pulled off intake manifold, took everything apart. Idles fine, runs fine.

I made a boost leak tester, fixed all the leaks, zip tied every hose, and now its completely silent under pressure. Still have high idle fuel trim. My maf is peaking at 208 g/s. Going to change air filter. Already took a bottle of maf cleaner to maf sensor. If air filter does not raise g/s I will replace maf.

I can't see if you mentioned but do you have the stock air intake system with snorkel and stock turbo inlet?

 

Any change in these can also affect the fuel trims/Maf data.

Stock everything except crank pulley, flywheel, uppipe and downpipe for engine stuff. Going to pick up fuel pump/vacuum tester to test fuel pressure. If thats good then I will purchase a maf.

Can you post a learning view of the F'd up fuel trim? How much correction?

In a class atm but the idle trim is at 15 and 3rd box is at 7-9 the other 2 are 1 and .something. lemme find post of old lv.

http://legacygt.com/forums/picture.php?albumid=1565&pictureid=8076

 

Looking for a leak, checked all the normal spots. Any ideas?

 

 

With these numbers if it were a vacuum leak it would be a hose completely off. But When I cap up the turbo inlet and put it under pressure, I dont hear a peep. Zip tied everything, replaced turbo inlet hose, and maf sensor hoses and it holds the pressure for a long time, but I am getting the same numbers. If its a leak it would be small but it shouldnt throw it off that much I would think.

Hmm..assuming your maf scale was solid before this craziness, you should log you front O2 and confirm that no odd readings are popping up. I am leaning toward a O2 or maf sensor issue.

 

It might be you maf scale was never really perfect..

Hmm..assuming your maf scale was solid before this craziness, you should log you front O2 and confirm that no odd readings are popping up. I am leaning toward a O2 or maf sensor issue.

 

It might be you maf scale was never really perfect..

 

I am leaning twords a 02 or maf as well.

 

Ive seen cars needing some tweeks for slightly higher that normal af learning but this is 100% stock maf scaling and stock box.

 

Dave

what is parameter for front o2 sensor? I only see rear o2. I talked with my mechanic and he said check the fpr because subaru fprs usually shit out prematurely, think this is a valid claim?

If you are using Romraider - AF Sensor #1. I have hear dof FPR crapping out, but never heard of it causing a problem at idle.

thank god.... cause my god damn obd2 cable just crapped out.... once it rains it pours.. ordering another cable. OMG why are sensors so much money 150 per sensor. Going to change O2 sensor first. I took it out to get my uppipe in, so HOPEFULLY it was damaged during uppipe installation and I can move on. Hmmm maybe I should see if its bolted in tightly. But I cant see anything on logger without my cable... god damn ebay.

Almost threw my laptop out the window..... sigh, nerd rage.

My purge valve seems to leak air... should it leak? I pressurize system and it leaks and makes noises, I unhook it and plug holes and I hear nothing, I connect it and I hear an accordian and air. Not sure if its supposed to leak, but it is called a valve purge.

Also had the arrow pointing away from inlet, others say its supposed to point towards it. So I turned it around. Waiting on cable so I have nothing better to do......

The sound was actually coming from air coming out of the 2nd biggest hose on turbo inlet, the one going to plastic piece that goes to valve covers. Zip tied it no more small hiss.

 

Also took a look at up pipe and down pipe, up pipe/ exhaust manifold gasket was not thick enough and was leaking do to a gap. Found it because I took off heat shield and had my friend rev engine and sure enough puffs of smoke. Luckily up pipe came with a thicker rubber style gasket and I had ordered a grimmspeed with it as well. I put the thicker one on uppipe side and the metal grimmspeed on exhaust manifold and it sealed very well and no more leak.

 

I also soaked the O2 sensor in gas all day to clean it some. It was changed 20k miles ago, which is why i dont want to believe it may be issue. Also turned my valve purge around, after playing with it, it looked like one direction had a better seal/lock than other. So I put that side on right/driver side to make sure when intake was pulling air it would have better seal, or so was my logic.

 

End result is the car is very different, its now as quiet as it was before I installed up/downpipe. Runs better as well. Hopefully when I get cable I will see good results.

I also soaked the O2 sensor in gas all day to clean it some.

 

That's a good way to destroy a working sensor.

 

http://ls1tech.com/forums/conversions-hybrids/1467206-can-oxygen-sensors-cleaned.html

http://www.kia-forums.com/1g-2001-2005-rio/76793-dont-clean-your-o2-sensors-gasoline.html

Shit happens.

[ame=http://www.amazon.com/Denso-234-9120-Oxygen-Sensor-Ratio/dp/B001F799X6/ref=au_as_r?ie=UTF8&Make=Subaru%7C13&Model=Legacy%7C64&Year=2005%7C2005&carId=002&n=15684181&newCar=1&s=automotive&vehicleType=automotive]Denso 234-9120 Oxygen Sensor (Air and Fuel Ratio Sensor) : Amazon.com : Automotive[/ame]

 

score. For 90 bucks shipped.... cant beat that. And I ordered it yesterday morning and its here already. Looks exactly like oem one.