I also have a stock airbox but no filter for it that I can find.

i think i have the fliter...

ill double check

i can only think about when my dumbass thought it would be cool to get a vent to atmo bov when i had my first 02 WRX, every dam time i would let off and at idle the shit would stumble endlessly.

then when i got the black one and front mounted it i had a tial bov. that POS had like the losest spring known to man. everytime it got cold here or i went down the hill to sac or the bay it REFUSED to idle. period. did the EXACT same thing daves cars been doing.

i cant believe i didnt see the parallel when he was in my garage. i must have fucked with that tial BOV for a week straight. i feel stupid.

Everyone is being very helpful, thank you. I tried to attach a image of enginuity fuel logs at idle. Its even more lean now, but fine while driving.

yeah i really think ur BPV is leaking. are you working today ?

no, no work today

Your AF Correction is max'ed at +25, which is the limit. The engine is so lean(>25%) that the ECU can no longer compensate, so your AFR is higher than the 14.7:1 it should be. Gotta be a significant leak after the MAF, and since/if it is at idle only then Phil may be right.

To make sure it is at idle only - you may want to log and graph the AF corrections while cruising around.

I would need someone to drive with me, I not that familiar with the program, just know how to get live data.

i aint doin ish ATM, i wonder if i can rig something to make ur bpv work.

We could take the bpv off and plug the holes, see if that works

easier said than done. im trying to think of how to plug the IC hole. hmm.

i guess just call me and you can come over and well break stuff ;)

just come by and get my BPV. If it fixes it - it's yours.

awesome we are prolly going to grab that up before the meet tonight. either pm me or dave (ddubs) your address and when it will be cool to grab

So the new BPV did not solve my idle problem. I did some logging yesterday. A/F ratio's are perfectly normal when crusing, at WOT the are at 11:1. Only at idle the fuel trim goes to +25 and A/F is at 17 to 18:1. This morning the car stalled on the first start.

I decided to take all the hoses off last night, in search of a tear (Inlet hoses suck). Long story short, I didn't find a thing. All the vacuum hoses look good as well. What could this be? a tune issue? I don't want to take it to subaru and have them steel my money.

Did you try fuel injector cleaner?

could the fuel pump be underpowered at idle. Perhaps a wiring issue?
(I dont know if thats possible or not but I am just throwing out ideas)

I put in some gas treatment stuff yesterday, I will get fuel injector cleaner on my next fuel up. I don't think the fuel pump would be bad. C and C tested the fuel pressure.

the fuel pressure at idle was normal? and I didnt see it in any above posts but did you ever revert back to stock?

I reflashed to stock plus other maps as well, with no luck. I just talked to Dave at C and C. He said they tested fuel pressure between the engine and the fuel filter, everything was good.

Does anyone have streettunner? or does any no how to tune with enginuity? Dave was suggesting that the idle tables may need to be adjusted, since it runs fine everywhere else. At this point I will pay someone to try!

Ed will be here next weekend or you might consider DB Tuned in Roseville. Paul tunes and troubleshoots.

I fool around with enginuity a lot. Don't know what idle tables he's talking about. There are tricks to get the idle to smooth out with bigger injectors, but that is just in the MAF table. You can also change idle speed too. If you have stock injectors and a stock MAF table (after reflashing back to stock maps), and your trims are max'ed at 25, then you have a problem that needs to be fixed.

You should log fuel corrections while cruising around. I bet they are high but not quite 25.

While cruising, fuel correction factors are around 0. I will double check later.

The more you write, the more it has just got to be unmettered air after the MAF. Is the MAF itself leaking or backwards??

Actual correction = Learned + immediate correction.

Logging in Enginuity is just like dash boarding except it writes the data to a file. I can't figure out how to start logging without using the enable defrost switch button though because I haven't tried.

yeah that was the straight up first thing i checked. backwards maf.

when i had my head in there i know i hear a leak, but we couldnt find it and it got dark.

I agree, there has to be unmetered air coming in somewhere. Unless my O2 sensor is bad, but tests good?? I checked all the hoses, vacuum lines, we tried plugging the BPV as well, even put a new one on. I'm gonna do another test run now...

Double checked. A/F ratio while going 70mph is at 14.4:1, correction factor stayed between -.75 and 2. I'm confused...

I just cleaned my IAC and my idles a lot better. You should try it for a cheap fix and you don't even need to remove anything to get to it.
http://forums.nasioc.com/forums/show...ight=clean+IAC

Oh and make sure all the hose clamps are straight on the intercooler hoses. I know that I have put some on crooked by mistake when in a rush or late at night.

I just cleaned the IAC and put a new gasket in. It was dirty, but it still idles the same. I have checked and double checked all the hose connections, there all good. Is it possible to change the idle tables? I don't even know if they exist.

There are no "idle tables" that I know of. The MAF table could be rigged to make it run better, but that is a bandaid, and as soon as the problem is found and fixed you will start running -25 fuel trim and be too rich.

did u try the wiring fix ?

It's not the ECU or the map if it was working well at some point, and especially if you throw a stock air box back on and it still has the same problem.

Put a stock air box on and uninstall the AP and take it to Subaru.

Based on your AF trims, other than unmetered air after the MAF, I'm out of ideas.

My last attempt will be the stock air box. I do not have one here, but will be going home this weekend. I think my air box is there. If it doesn't work, then its off to subaru.

Just found out that I no longer have a stock air box.

Dean, could I grab that stock air box from you and give it a try? If it doesn't have a filter, I can buy one or maybe go to a junk yard and grab one.

So I feel dumb. The stock air box solved all. A/F ratio is right at 14.7 with 0 on the correction factor at idle.

Maybe after cleaning the air filter for a second time (or even third), it was flowing more air and/or creating more turbulance. So the MAF sensor was seeing less air, when more air was actually flowing by. The sensor could not correct enough for the extra air flowing by, therefore running lean. I still don't understand why this would happen after cleaning the MAF?

Thanks for all the support everyone, I appreciate it.

Dean, can I buy your air box off of you? If not, can I keep it until I get a new one? I also may be interested in you TMIC.

Glad that fixed it!

I'd like to get my air box back or a replacement at some point in case I ever take my car back to stock, but no rush.

We probably have somebody who isn't ever going back to stock or you can pick up a used one cheap either locally or from Rancho Cordova.

you cleaned the filter at the same time as the maf ?

I thought the stock airbox was one of the first things you tried... or I guess it should have been ;)

That's a weird coincidence or whatever. If you want to still go with a short ram (for whatever reasons) the Cobb acts just like the stock airbox in my experience (except for the whole hot air thing).

My two cents:

Choose a good CAI or the stocker
Choose your filter element
Get custom tuned
Stick with the same filter element when replacing it or cleaning it (often)
Profit

(in that order)

The last time I cleaned the filter was 5000 miles ago. If I had my original stock air box, I probably would have tried that first. Its just weird that the intake would affect idle after 50k+ miles and cleaning the MAF sensor. My guess is that the filter is no good anymore. I will be looking into getting a different intake and a retune eventually. I need to find a stock air box for now.

aps or bust

Anyone know where I can pick up a stock air box? The dealer is way overpriced. I was looking into Cobb's intake, but its made of plastic and I heard it falls apart.

Nasioc classifieds is always an option as well as www.subaruparts.com and www.subarugenuineparts.com

Wreckers in Rancho Cordova or even local are a good bet.

I have a generic in fender CAI lying around. Check this thread.

http://www.seccs.org/forums/showthread.php?t=5863

I have a brand new never-installed older APS CAI (stock 65mm dia). It is black not wrinkle red. PM me if interested

you should jump on that, they react just like stock airbox.

I might have a stock airbox... or at least one with the silencer cut off it.

The silencer is a seperate piece. Yous houldn't have to "cut" anything.

Well, if he wants an air box that breathes from under the hood instead of from the fender or the snorkus... then sure. But I've got the elbow from the fender (with the silence cut off it) and the snorkus too I think.