2015 Wrx Af Learning 1 At Idle, AF learning and weird idle For the first time, my 17 STI was idling a little weird today when I started it. I hope this helps someone in the future. By joining our community, , you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. The values change a ton more than they use too, on freeway it gets up to -24, cruising around town it’s about -5 to -14 and when at idle it’s -30 to -40 which is terrible i have cleaned the MAF sensor and im not sure what else to do. Jan 26, 2025 · I am getting some high a/f learning numbers. I have a 2018 WRX that I bought used with 28k on the odo. /r/WRX is a place for Subaru fanatics to show off their rides, discuss modifications, mechanical issues… /r/WRX is a place for Subaru fanatics to show off their rides, discuss modifications, mechanical issues, industry news, and more. All I have is the cobb big sf intake and the +1 93 tune. 62 at idle but gets closer to 0% under normal driving situations. 91 consistently. My AF learning 1 at idle seems to be pretty high highest I've see is +18. 5L Turbo) I have a 2015 wrx and lately it has been running lean. Assumed boost/vacuum leak. Just to be clear, the AF correction is a positive 25%? What about AF learning #1? AF Learning 1 at -16 through-20 at idle The problem popped up 2 days ago and I’ve done a little research. 0 volts during heavy acceleration. 91 and +3. 81 are normal cruising events. With the problem at idle, MAF was 1. It will never drop into the negatives, and will be around 6-7 on idle, and when I'm just cruising around. Subaru Knock Monitoring Knock! Knock! Who’s there? It could be nothing at all, but, it may be cause for concern. You begin to be concerned when you see knock events -2. 5L Turbo) 2015 WRX Negative AF correction at idle/low throttle fluctuating AF FA Series Factory 2. Learning D is expected to be zero if the car is flashed. Yes, just adding airbox shouldn't change anything. AF Learning 1 is the current value your car is using to determine how much fuel to supply. I have a gas gap from oreillys and fits fine. Couple that So a few weeks back I noticed my a/f learning 1 has been about -9 lately when cruising. checked all intercooler clamps from the throttle body and down to the turbo. at first start up the idle will fluctuate terrible until it starts to get warm (above 1/4 on temp gauge). in the past it's always been within 0 and -2. 0L Turbo) 116K subscribers in the WRX community. 5L Turbo Powertrain (EJ Series Factory 2. This is the best condition for the catalytic converter to do its job thus providing for a better environment. I have a 2019 WRX with ETS intake and j pipe Pro tuned. It can get as high as 12 and as low as -12 sitting on a base map on a Cobb V3 accessport. 7 for learning and 0. Another FA20 WRX AF learning 1 post. Second, my AF Learning 1 sits at about -15. Are these numbers within normal ranges? Now AF Learning 1 is sitting at about -10 idle and close to 0 when cruising. Normal parameters while driving. It will zero out on WOT. My AF learning numbers often times after driving even short distances at idle Spikes to +20?? Why is this happening? AF Learning 1 High FA Series Factory 2. 0L Turbo Powertrain so i have noticed that at idle the af learning drops to as low as -42 and at normal driving its around -15 to -20. AF Learning 1 Values AccessPort * Registered users of the site do not see these ads. Sometimes the car struggles just a bit to fire up. I haven't done anything different to the intake system AF learning +10% (approx) 2015 wrx stage 1 etune plus panel filter AccessPort At idle both A/F correction and A/F learning values are low like -1. I looked through the assembly and couldn’t find anything blocking airflow. 41 to -2. Moral of the story intake was taken off 1,000 miles after install due to how messed up my fuel trims were. DAM is at 1. It's now sitting at 33k and I am starting to have sporadic AF Learning 1 numbers during idle and while driving. It’s normal for correction to swing around +-15 but AF learning should be around +-8%. 7 when idle and fluctuates a small amount when driving, according to Google that seems to be fine. High values at idle. Datalogging and monitoring with the Accessport can provide useful data on these knock events. AF Learning 1 Idle 2 (AF Learning Idle2) -> Long-term (learned) fueling correction during idle conditions above RPM breakpoint. high a/f correction and learning at idle Jump to Latest 38K views 47 replies 5 participants last post by wrxdan Oct 8, 2013 wrxdan Discussion starter So my AF learning 1 has always been @ zero since I've had my AP . 5 to -13. 8 or higher when at A/F Correction 1 values on Accessport Engine Management & Tuning Welcome to the NASIOC. 0 I put a S&B intake on my truck first startup I got got a check engine light with a P0171 & a P0174. 36 votes, 38 comments. Took my car out early in the morning while it was quite cold (~50°F) and started to get some weird AF Learning numbers. It is not a place to buy/sell/trade or spread negativity/hate. Knowing the difference can give you peace of mind, or, could be an early indicator of a mechanical issue ticking away on your Subaru. Thanks everyone for the suggestions! Does anyone have any suggestions on things for me to check? I've had this issue crop up over the last month. however, after bout 1-2 weeks my AF learning 1 value at idle now is consistently @ -0. I'm afraid it may be running lean. I like to keep it within +/- 5 I've had at idle where it was +/- 11 with no issues to idle and had a shop do a boost leak test with nothing wrong. Feb 12, 2025 · After this, I was experiencing extremely high AF Learning 1 values, north of +35%. randomly, when i stop at a light the engine will bog in rpms and idle rough but if i blurp the gas itll go back to normal. Here are the numbers: Idle: AF Learning 1 hovers around +5 light throttle (20-30%): hovers around +6 Heavy throttle: Around +3 WOT: exactly 0 Idle with AC on: This is where it gets a bit weird, this has climbed upwards of +13 but usually hovers around +10. tuner said check the usual spots. Are these numbers acceptable for a couple of days until I get the protune? My AF Correction 1 numbers were staying very high, 18%-25% even at idle. Registration is free, fast and simple, so please If you The MAF voltage reads 0. We'll explain feedback knock, fine knock learn, and DAM and how they work together. The other day when stopped at a red light was also Arguably the most important are DAM, feedback knock, fine knock learning, and af learning 1 Feedback knock is what your sensor registers. However, it was reading 3. All of a sudden my AF learning 1 is at -13. Just good to see what you have done to help diagnose. I've checked for air leaks visually found the throttle body inlet to the intercooler was bad so I replaced it yesterday and reset the ecu and today it's already got back up to +18. 5 years ago. AF Learning 1 though averages between -3 to -9 around town, but highway speeds today it got to -15 and even close to -20 once but stayed around -12 to -18. At low acceleration, it started to move to -10 but it soon started to rise back up to where it was around -3 after a few more minutes of driving. I have an intake but I am tuned for it. 48% to 2%. 3 how did you calibrate your MAF to the altitude here? Thanks I'm getting some large negative numbers for AF Learning but only when at idle. MAF has been cleaned more than once and done delicately. Should not matter cold or warm, if it’s tuned properly the corrections and learning should be minimal. 78 and ~-1. Anywhere from -17 to -36. 5L Turbo) Under load they fall in the acceptable range, but at idle af learning usually sits around 12-18, and af correction will just as high or low as +- 25 when letting off the gas or switching gears. Sometimes it dips to -17% at idle but then comes back to -15. Hello! Just recently went stage 1 with MAP's tune and looking at my AF Learning 1, it stays around -10 at idle, sometimes goes… Oct 23, 2018 · Re: AF Learning, something to be worried about? Your ranges looks fine. 75 to +25 at idle. 0L Turbo Powertrain (EJ Series Factory 2. AF Learning is what you want to keep an eye on. 0L Turbo Powertrain Very High AF Learning 1 Idle and Low AF Learning 1 During Cruising Factory 2. High numbers when changing gear, or just taking off are also usually no concern. With a Cobb Big SF intake. I have a 2002 wrx with catless up pipe, catless downpipe, intake and a Cobb stage 2 tune. High negative af learning 1 at idle, normal values while cruising , sometimes it spikes up to -22 etc, boost leak? Dirty sensors ?any help is appreciated thanks! Welcome to the . 8 at idle and exceeds 3. 0 at idle. 2 V and 3. Very High AF Learning 1 Idle and Low AF Learning 1 During Cruising Factory 2. 8 g/s of air due to AF Correction & Learning. AF Learning 1 Idle 1 (AF Learning Idle1) -> Long-term (learned) fueling correction during idle conditions below the RPM breakpoint. How can I determine which sensor is malfunctioning? Would a fault in either of these sensors lead to low boost? There are some differences in newer model year (2015+) WRXs, but for EJ equipped Subarus, these monitors include: A/F Learning 1, Boost, DAM, Fine Knock Learning, and Feedback Knock. During driving it can fluctuate between -3% to +3%. Your AF Learn 1 looks good. 2015+ WRX A/F Issues - Need help FA Series Factory 2. 7x sometimes even to ~ -3. i've been told a variety of ranges from Cobb that are considered "normal," including +/- 8 af learning. 0L Turbo Powertrain Hey guys, My 2017 WRX is Running a Stage 1+ 93octane tune. 72 anytime at idle. Apparently if you have values of that sort you apparently have air restrictions at some point. I’ve had some high AF correction/learning numbers and I’m not sure if it’s a tune thing? Something else going on? You need to see both AF learning and AF correction. 5L Turbo) Many Subaru owners like to monitor knock correction on their AccessPort. 7/1 (this means 14. I just want to find out if the numbers indicate a problem before I go on the hunt for nothing. 8 V, which should be 15 g/s of air on my tune. Hello! Just recently went stage 1 with MAP's tune and looking at my AF Learning 1, it stays around -10 at idle, sometimes goes… High Negative AF Learning, what have I missed? Factory 2. 02 wrx, 4eat, stage 2 ots tune. 0L Turbo Powertrain AF Learning #1 A AF Learning #1 B AF Learning #1 C AF Learning #1 D The car does not need to be running to read these parameters -- they are stored in memory. the other day it threw a cel for p0172 ( system too rich). i went over all the hoses and finally just swapped out the BPV gasket May 6, 2023 · So I switched to those and AF Ratio stays around 14. They were flow tested and tested great. I only noticed this starting to get low after getting new tires, but I can't see how that's related. I've heard that the voltage should be around 1. 7 pounds of air to 1 pound of fuel) the amount of air will combine with all of the available fuel. When under load it is around -5 but still drops to -9 when cruising. 78 for correction. . I’ve recently replaced my Spark Plugs and my PCV Valve. You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. 5 % while cruising at any speed if I'm in the city cruising 2015 sti, anybody have any idle issues with id1700 injectors? It’s getting tuned for flex fuel but on gas it hates to idle and cruise at light load. Depending on what load your engine is expecting, it will change the target value between the values stored in a, b, c, or d. Events of -1. In terms of the idle issue its not a fluctuation of rpms but more a small "buck/hiccup". It should ideally be in the +/-5% range. When I logged MAF voltage, it was raw data and the problem showed itself. 4 g/s of air. Got codes for P0457 and P0171 but they never pop up the same. checked all the hoses by the turbo inlet. 0, feedback knock and fine knock learn always sit at 0. EDIT: I actually don't know if this is the case for the FA20. 78 is this something to be worried about I have a 2015 GMC 2500 with the 6. 62. AF learning 1 8-14% at idle Factory 2. K&N panel filter, STi up pipe, Perrin catted downpipe, no other related mods. Could it be a 36 votes, 38 comments. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload At 14. Without the problem at idle, MAF was at 1. Increasing the idle by 100 rpm in the Accessport definitely seemed to help, as I have idle AF Learning 1 values of around +11 to +18 now, but it is still concerning me. It's thrown a lean code and I really don't know where to look. 2016 WRX. The odd thing is this would only happen at idle and while stopped. DP was used, new o2 sensor when installed withdownpipe 1. 1 when I presss the gas it goes up to either 0 or -0. Bouncing around between 500-1700rpms for a little while and then it was fine. So my AF Hello a recently purchased a 2016 Subaru WRX and I recently installed a top mount Garrett Andy BPV as well as a charge pipe I am currently running a accessport running a stage 1+ big SF intake 91 and obviously the Cobb intake I am new to tuning so I’m trying to learn as I go well after two Hey I live in Colorado now with my WRX and my AP is showing my AF learning 1 ranging from -5. 75 at idle. These sensors can be quite expensive, and I'm unsure if they are actually faulty. while idling it goes down and fluctuates to -33 to -22, while cruising fluctuates -28 to -17, goes to 0 at wot. I have yet to find another case like this. Wondering if y’all could give me some insight about if this is a problem or normal, and if it is a problem what would be the causes. Apr 13, 2015 · 2015 Extreme Negative A/F Learning While Idling AccessPort * Registered users of the site do not see these ads. -36 2020 wrx cobb sf, egr, tgv, FF pro tuned a month or so ago. I can provide datalogs as AF Learning 1 - Cold weather and you FA Series Factory 2. I pulled over and shut car off and my idle went back to normal staying between -1. If anyone with experience could lend me a hand with this, it would be much appreciated. LTFT is AF Learning, STFT is AF Correction. Unlock power hidden within the vehicle by replacing conservative factory settings with more aggressive calibrations. AF Learning 1 Troubleshooting currently having high negative af learning 1 issues. The Accessport V3 is the world's best selling, most flexible, and easiest to use ECU upgrade solution for your Subaru. No CEL and car feels fine at idle and driving. I have a 2011 WRX and My car has a cobb SF Air intake, Cat back exhaust, GFB Hybrid BOV which I almost never vent to atmosphere all ways set to recirculate, and have accessport stage 1 sf 93. I Re: AFR Correction 1; what is the normal value @ idle? Yes, AFR Correction should read the same regardless of mods. com Subaru forum. 0L Turbo Powertrain. Under any load whatsoever and any speed that isn’t 0, even with the car out of gear and the engine idling, it would hover between -3. 2013 WRX AF Learning 1 at +25% at idle Factory 2. py1mue, vdnzd, saeeq, vkepd, 944oz, rx0qg, xhdd, s9w9xk, rzeynk, htdv,