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Old 07-06-2019, 01:24 AM   #1
Mattdog2020417
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Default Running lean?

So i. New here and to the subi family, i live in ozark missouri area (huge hills on the highway) and when i drive up a big hill in 5th its hitting 16s on the a/f guage. And at idle she idles at 5 or 400rpm and goes between 14s and 16s is this normal im in the safe range 13 to 15 when im driving and when im ripping on it its anywhere from 11s to 13s 14s. Does this sound accurate? Im gonna change the fuel filter tomorrow if it doesnt rain it rained on me today. Lmk thanks and sorry for the newbie questions. I just wanna make sure its not hurt or i am hurting it.
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Old 07-06-2019, 11:07 AM   #2
Jersey Man10
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Don't go up hills in higher gears yes you are running lean.
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Old 07-06-2019, 05:02 PM   #3
Mattdog2020417
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I did it today with no ac 13 14s so my ac is robbing my power so if i have ac on ill just down shift
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Old 07-09-2019, 09:48 AM   #4
bdubblu
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Hello new person... Fill out your daggone profile so we know what ride you've got an the upgrades.

Your idle is a little low. Adjust the idle screw on the throttle body. It may help with your lean issue as well. I believe somewhere around 700-750 is normal for the 2.0L with stock injectors.

Clean your MAF sensor. $2-3 for MAF cleaner at the local autoTrash store. Spray the MAF and let it dry for a couple minutes. The MAF sensor is up inside the tube. The part hanging down is your IAT, so you need to spray up in the tube to clean the MAF.

AFR of 16 is lean and you need to fix it. Don't know if you're tuned or not, but either way that's not healthy and I suspect there's other instances that your car is leaning out and you're not seeing it. That's a disaster waiting to happen. Get it fixed/ tuned.
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Old 07-09-2019, 08:36 PM   #5
Mattdog2020417
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Ok so today i changed the fuel filter and cleaned the maf. The maf was very dirty suprised it didnt throw a code. I sprayed it let it dry for a bit and reinstalled it. The car still idles at 400 rpm ish i tried messing with the cables but there to damn touchy sliggtest adjustment seemed to infuriate it and it would hold at 1300rpm. The car is more responsive since the filter change and maf clean but its still slight speratic a/f at idle its 15s to about 16.2 16.2 for only a slight second and itll surge back up to 15s. When i start the car the initial a/f is 13.5 14s then settles in the 15s mainly untill itll chug a sec and drop to 16.2 ish. The car as far as i know is a jdm ej205 with a vf34, invidia down pipe, mangna flow on back. Pink sti 565cc injectors. Cx racing radiators and race fans, aem tru boost guage, aem a/f guage aem oil pressure guage. Thats about all i know about it. I have no idea about the header or up pipe i have yet to crawl underneath it its lowered and im fat lol.... sorry for the long reply and i apologize again for not filling out my profile im not good with this website profile things.
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Old 07-09-2019, 08:57 PM   #6
danger1138
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Doesn't really matter too.much that the afr is in the 16's at idle, not saying thats ideal but its also not gonna kill your motor.

What will kill your motor is running 14's; 15's; 16's afr when you're boosting and there is a significant load.

Forget about the idle afr for now, its not as important as your afr while in open loop .

OP, are you still running the stock turbo inlet?
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Old 07-09-2019, 11:20 PM   #7
Mattdog2020417
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Its a perrin turbo inlet. And its 11 to 14 when im rippin on it. I can take a vid and post it to youtube probably if ya want. Idle and when my ac was on and climbing a hill in 5th itll dip 16s for a sec when i did it again the next day with ac off it never dipped below 15s unless at idle. Lmk oh and i havent gone up any big hills since i changed the filter and cleaned the maf. Ill keep ya posted on that. So i just took it for a spin and got one boost hard shes 10s 11s at peak i believe.

Last edited by Mattdog2020417; 07-10-2019 at 01:34 AM.
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Old 07-10-2019, 09:06 AM   #8
86Dreams
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Quote:
Originally Posted by Mattdog2020417 View Post
The car as far as i know is a jdm ej205 with
Youre probably getting that chugging and surging at idle because of the motor. JDM 205's didnt have TGVs. Since youre probably still on a USDM ECU its trying to control the motor like it has TGVs, but since it doesnt the motor isnt responding like it should so youre getting that swing in afr.

This happens to me. I had TGV deletes on my 205. Now I have a 207 in my bugeye and the 207 doesnt have TGVs either. When using my USDM ECU on either of my motors without TGVs, the idle will behave just like youre describing.

When I run my 207 with a JDM ECU, it idles normally, because the ECU is expecting a motor without TGVs.

Im not sure that this can be tuned out.


A couple other things:
If youre getting 16s under light boost thats probably because it wasnt tuned correctly, it needs some kind of compensation in one of the tables for a different intake and motor. I know this first hand. If its worse with the AC on then thats because the motor is pulling in more air to power the AC, you can still wind up running the same 16 without the AC on if youre, say, going up a hill.

When you cleaned your MAF did you spray the stem or did you spray down into the stem and the hollow part of the flat body? you will need to do the latter if you did not, just spraying the stem doesnt clean it.

Last edited by 86Dreams; 07-10-2019 at 09:12 AM.
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Old 07-11-2019, 02:47 AM   #9
Mattdog2020417
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I plan on getting it tuned the tuner i just went and seen said he can't access Subaru data unless i had a aem he said he doesnt do cobb. So ill have to find another. I have a guy who he referred me to as "a guy that knows a lot about those subarus" looking at it friday. Since i did the filter and maf the car runs way better up hill or normal acceleration. Even hit some 10s in wot. And yes i cleaned the stem and internals. I ordered plugs im gonna install those tomorrow.
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Old 07-11-2019, 08:47 AM   #10
86Dreams
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Quote:
Originally Posted by Mattdog2020417 View Post
I plan on getting it tuned the tuner i just went and seen said he can't access Subaru data unless i had a aem he said he doesnt do cobb. So ill have to find another. I have a guy who he referred me to as "a guy that knows a lot about those subarus" looking at it friday. Since i did the filter and maf the car runs way better up hill or normal acceleration. Even hit some 10s in wot. And yes i cleaned the stem and internals. I ordered plugs im gonna install those tomorrow.
AEM will be pricey, its a standalone. Theres open source as well you can get tactrix for like 200. then there is a cell phone app btSsm that turns your phone into an accessport.

When you get it sorted out let us know what happened.
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Old 07-11-2019, 09:18 AM   #11
danger1138
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Quote:
Originally Posted by Mattdog2020417 View Post
Its a perrin turbo inlet. And its 11 to 14 when im rippin on it. I can take a vid and post it to youtube probably if ya want. Idle and when my ac was on and climbing a hill in 5th itll dip 16s for a sec when i did it again the next day with ac off it never dipped below 15s unless at idle. Lmk oh and i havent gone up any big hills since i changed the filter and cleaned the maf. Ill keep ya posted on that. So i just took it for a spin and got one boost hard shes 10s 11s at peak i believe.
It shouldn't be 11-14 afr when you're 'ripping' on it. Typically a tuned subaru should be 11.5 or less when you're 'ripping' on it (tend to lean on the richer side of things).

Forget about the idle, dont mention it anymore, damn it.

Last edited by danger1138; 07-11-2019 at 12:06 PM.
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Old 07-11-2019, 09:48 AM   #12
bdubblu
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Quote:
Originally Posted by danger1138 View Post
It shouldn't be 11-14 afr when you're 'ripping' on it. Typically a tuned subaru should be 11.5 or less when you're 'ripping' on it (tend to lean on the richer side of things).

Forget about the idle, dont mention it anymore, danm it.
Getting back to the idle... OP should totally adjust it.
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Old 07-11-2019, 02:24 PM   #13
86Dreams
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Quote:
Originally Posted by danger1138 View Post
It shouldn't be 11-14 afr when you're 'ripping' on it. Typically a tuned subaru should be 11.5 or less when you're 'ripping' on it (tend to lean on the richer side of things).

Forget about the idle, dont mention it anymore, damn it.
If he can fix it he should. a pro tuner might now how to access the parts of the tune that account for a tgvless manifold. I never bothered to dig that deep in RR you would need to sit down with ida and dig around. and even then it might be something you cant adjust.

we have no idea what he means by "ripping on it". litterally maybe hes got a boost leak and running like 8 psi we would need to see a log to know what the car is actually doing
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Old 07-16-2019, 06:23 PM   #14
Skadoodle27
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Definitely running lean too! Having a current issue with AC as well. The clutch wont engage on it unless we kickstart it. Help?
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Old 07-17-2019, 08:48 AM   #15
86Dreams
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Quote:
Originally Posted by Skadoodle27 View Post
Definitely running lean too! Having a current issue with AC as well. The clutch wont engage on it unless we kickstart it. Help?
you should post that in a new thread and include a lot of additional information, make, model, year, what you mean by kickstart, etc
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