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Old 05-28-2015, 09:45 PM   #1
superfuman
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Default AP High? AF Learning ABCD

I don't know what normal AF learning a-d should look like for a mostly stock 06 wrx, but mine numbers seem weird. I was reading that you should see the numbers rising or lowering relatively? But it looked liked mine were fairly random. I don't have the numbers here with me, AP is in the car and I'm at work. But it looked something like:

A:2.XX
B:0.6
C:15.00
D: 0

I'll repost with exact numbers later. I've also been throwing a p0171. And I do have a spectre intake that the previous owner installed. Does any of this info help indicate where I should start looking? Vacuum leak wise, or anything?
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Old 05-28-2015, 11:50 PM   #2
superfuman
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Actual numbers ended up being:
A: 3.40
B: 1.6
C:15
D:0

C and D never changed. Can't post a catalog yet as my PC took a dookie. How abnormal or normal does this look?
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Old 05-29-2015, 01:12 PM   #3
Cobb Tuning
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Your vehicle has a mechanical issue. It's possible that this is the intake system itself, which will definitely cause learned fuel trims to skew. To eliminate that as a possibility, you can switch back to the factory airbox and air filter. If that corrects the issue, you can choose to have a custom tune performed for the alternate intake or just keep the stock one. Alternately, you make have an intake tract leak, a worn MAF sensor, plugged fuel filter or any other of a number of potential cause. Removing the aftermarket intake and performing a pressure/smoke test on the vehicle would be the first two steps.

Cheers

Lance
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Old 05-29-2015, 06:36 PM   #4
superfuman
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Ill get it tested. I'm on the lookout for a stock airbox already. Thanks for the replyLance, you're awesome!
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Old 05-29-2015, 06:43 PM   #5
superfuman
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On a side note: my MAP looks to be reading 23.84psi, but boost only hits 10-11 psi at WOT. Should these numbers be similar or is this way out of whack?
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Old 05-29-2015, 06:59 PM   #6
wodom86
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what map are you running? 10-11 psi with a target boost of 23.84 psi and A/F Learning C really high, that's pretty indicative of a boost leak. What ever the leak is, it doesn't appear to be leaking at vacuum, which means you probably need to start checking hose clamps after the turbo. i have seen the factory Y pipe under the intercooler dry rot around the ends on these cars, and also seen oil blow by into the intake system can cause the charge piping to swell in certain places and only allow leak by under boost. Check clamps, if you don't get anywhere, then plug the charge pipe after the intercooler and before the throttle body, then plug the charge pipe right after the turbo with a home made pressure test kit. Pressurize your intake tract to your map boost levels and watch the gauge to see if it drops, listen for air leaking.

http://forums.nasioc.com/forums/show....php?t=2205161
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Old 05-29-2015, 08:02 PM   #7
superfuman
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Just running a stage 1 91 oct map. Target boost is 13.5 I think for that map, but my accessport shows MAP psi is 23-24, which is what's making me nervous. Accessport also reads I only ever hit about 11.8psi boost at WOT, even after using a HWG map.

I'll try and get a smoke test done to see what's throwing it out of whack. I've only owned the thing for about 2 months, and am quickly learning that the previous owner wasn't to keen on upkeep.

Last edited by superfuman; 05-29-2015 at 08:03 PM. Reason: additional info
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Old 05-30-2015, 12:32 PM   #8
wodom86
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Read map notes and since you aren't hitting max boost your ECU is trying to get you there by raising targeted boost levels. You will notice that when you get closer to your map boost level target boost numbers will go down as you get closer
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Old 05-31-2015, 01:06 PM   #9
superfuman
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Isn't MAP baro pressure + boost? So if my MAP sensor is reading 24psi, and I'm only hitting about 10-11 psi boost, plus natural baro pressure = about 24? Barometric is like 14.7 depending on elevation, right? So that 14.7+10psi(my boost) equals 24ish. Unless the data the MAP shows already accounts for baro pressure.
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Old 06-02-2015, 02:32 PM   #10
superfuman
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Got a smoke test today. They saw smoke pouring from the recirculating valve? Apparently the previous owner glued two gaskets together and tried to slap that in there. Reset ecu, and only drove it a few blocks. Do leaks in that location typically cause lean conditions?
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Old 06-05-2015, 04:18 PM   #11
Joshfl420
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uh yes. Cobb told you have a mechanical issue. Fuel trims should be within 5% of each other.

g get the right gasket and tighten down
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Old 06-07-2015, 04:06 PM   #12
superfuman
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Quote:
Originally Posted by Joshfl420 View Post
uh yes. Cobb told you have a mechanical issue. Fuel trims should be within 5% of each other.

g get the right gasket and tighten down
They tossed a new gasket in there at the shop. Still throws a code, but now I'm pretty positive it's just the cheap ass intake the previous owner installed. I should get a stock airbox in the mail tomorrow. So, we'll see how it turns out.

No other boost or vacuum leaks aside from the recirc. valve, so if it's not the intake, I'll start moving towards Maf/02 sensors.
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Old 06-09-2015, 03:48 PM   #13
superfuman
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Updating: Got a stock airbox installed. Reset ecu, and took her about 10 miles down the freeway and back, and it looks like fuel trims are still learning, but everything's much better, I think.
A is up and down a bit from 2.5-3ish
B is sitting at -.5 and C is sitting around -1

I think its still adjusting long term since A bounces around so much. Is that correct? Adding fuel to correct the slight negatives in B/C?

But no check engine lights after about 30 mins of driving, including a few WOT pulls in 3rd.
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