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Old 10-23-2019, 03:20 AM   #1
dairo1
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Member#: 479135
Join Date: Dec 2017
Default -18 af learning at idle 2018 wrx

As the title says. 2018 wrx at idle its going to about -18 on the af learning 1.

Just a little background info, it was worse like -20, before opening the hood and found the bottom of the engine intake had come loose, and found a whole bunch of rocks and stuff in it. So changed the engine air filter and cleaned the maf sensor.

Am just about to get and etune. And I really don't know how to check for leaks and stuff, I'm not much of a car guy. Could the etuner diagnose anything that is wrong, if anything is?

Any idea what could be the culprit? I See +- 16 is acceptable on the newer dit cars, but I'm even farther out than that!

I suck at cars.
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Old 10-23-2019, 03:12 PM   #2
ericsson
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Member#: 208672
Join Date: Apr 2009
Chapter/Region: TXIC
Location: Houston, TX
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2013 WRX STI Limited
Obsidian Black

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1. STOP trying to modify your car
2. Return car to OEM state
3. Check for AF learning once it's in OEM state
4. If reading still shows -18, take to dealership nearest you
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Old 10-23-2019, 04:23 PM   #3
GlarryHoodDIT
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Location: Colorado
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Sounds like a leak, get a pressurized smoke test done and go from there.

That's exactly what a dealership will do only they'll charge you out the ass
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Old 10-23-2019, 05:01 PM   #4
ericsson
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Quote:
Originally Posted by GlarryHoodDIT View Post
Sounds like a leak, get a pressurized smoke test done and go from there.

That's exactly what a dealership will do only they'll charge you out the ass
Considering OP says he sucks at cars, it's probably not a good idea. Subaru dealerships are now taking pictures of any modifications so they can later use them to deny warranty claims.
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Old 10-23-2019, 05:14 PM   #5
GlarryHoodDIT
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Which is exactly why I wouldn't suggest bringing it to a dealer. OP, get a smoke test done by a reputable Subie shop near you and go from there.

Is the intake OEM or aftermarket? Any other modifications on the car?
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Old 10-23-2019, 07:23 PM   #6
dairo1
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It’s just the ap and and axle back exhaust. I just wanted the tuner to smooth out some of the dam drops and the small feedback knock I was getting. How am I gonna tell them? Oh my af learning is low... I’m still under warranty but obviously they can deny me or give me a hard time since I have the ap now.
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Old 10-23-2019, 07:31 PM   #7
dairo1
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And it’s only at idle. When I’m driving or doing pulls everything is well within limits.
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Old 10-23-2019, 08:32 PM   #8
yamahaSHO
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2005 STi EFR 6758
04 S2000 EFR 7064

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The car is basically stock and a negative trim at idle is unlikely to be a leak considering a vacuum leak (noted at idle) pulls in un-metered air, resulting in positive trims.

If you want to get a boost leak test, I can set you up with some friends in Omaha. I make those guys test as they have a bit more than stock and well... There is always a leak.

Last edited by yamahaSHO; 10-24-2019 at 12:58 AM.
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Old 10-24-2019, 02:25 PM   #9
Fndragn
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Location: Iowa
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2011 Sti
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Where at in Omaha? Is the OP in Omaha? I ask as I live 15 minutes north of town. If he is local to the area there is definitely a top notch independent subie shop here. RG=Russ's garage!!
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Old 10-24-2019, 02:43 PM   #10
yamahaSHO
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He's in Lincoln. I wouldn't purposely recommend my customers go there... I lived in Omaha for 8 years.
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Old 10-24-2019, 05:17 PM   #11
Fndragn
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DGM

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Well let's hear your secret spot, I've lived here 40 years and am interested to hear who this is.
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Old 10-24-2019, 06:17 PM   #12
yamahaSHO
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2005 STi EFR 6758
04 S2000 EFR 7064

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If I had to recommend a shop, I'd point someone to SDR Performance. I run dyno days there, several times a year. Other than that, I've always done everything myself and taught many over the years to do things like this themselves.
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Old 10-24-2019, 06:56 PM   #13
Fndragn
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DGM

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It's funny you say that! My wife's 2020 wrx is there as I type this. Picking it up at 9:30 tomorrow am. It's a nice shop. When i recommended RG I was talking a strictly Subaru shop. I'd like to know the next time you have a dyno day there.
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Old 10-24-2019, 08:09 PM   #14
yamahaSHO
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Vehicle:
2005 STi EFR 6758
04 S2000 EFR 7064

Default

Vlad is good people... Too bad he got the dyno right after I moved back to Colorado. I will shoot to have one in the Spring, but I juggle 3 jobs, plus all the other stuff people do, so I have a hard time setting dates this far out. I retire from one job in about 7 months though.

I post up for dyno days on my page, so if you want to join that, you'll know when I do a dyno day. I only got one in this year, but I mixed it up with a turbo S2000 and GT-R, in addition to the Subaru's. Basically, I dial in E-tunes and finish the tune on the dyno day. It helps effectively use the time. We have talked about doing 2-day events, but I also like to throw in a track day if I can.

https://www.facebook.com/groups/388091141201858/

You might recognize this car...
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Old 10-24-2019, 09:24 PM   #15
Fndragn
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2011 Sti
DGM

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I'll keep an eye out for something coming up.
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