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Old 10-12-2021, 01:30 AM   #1
EvoZero
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Default P0507 2006 wrx

I have a 2006 wrx with IAG stage 3 block. I was tuned on 91/E85 flex and the car ran great. FP red, TOMEI UEL, speed density, fmic, tgv delete, Cobb 1300cc injectors, dw300 Rewired. Recently the code came on for high idle and it's been idling around 1100-1250 rpm's. I changed the front o2 sensor and have boost leaked checked the car. My tuner has no idea what's happening and I do not either. What should I start with? Afr at idle is 13.9-14.3 on my aem uego. When I get into boost, I see it go lean and then rich, when cruising it'll dip into the 10's when I get off the gas.
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Old 10-12-2021, 01:46 PM   #2
Unabomber
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The #1 cause of wonky idle in a Subaru: https://forums.nasioc.com/forums/sho...d.php?t=781242

Your tuner should have known this and I feel sad that he does not.
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Old 10-12-2021, 09:51 PM   #3
EvoZero
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Quote:
Originally Posted by Unabomber View Post
The #1 cause of wonky idle in a Subaru: https://forums.nasioc.com/forums/sho...d.php?t=781242

Your tuner should have known this and I feel sad that he does not.
Car is drive by wire. I changed plugs, and pcv valve today, same thing. When I changed plugs they were wet. Tuner claims my car looks fine and most likely mechanical. While coming to stop signs the idle with drop and hold at normal 950-1000, after sitting at a stop sign it'll rise.I've checked all connections and am stumped why this would happen all of a sudden.

Last edited by EvoZero; 10-13-2021 at 03:18 AM. Reason: Added info
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Old 10-13-2021, 09:53 AM   #4
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Do you have your ac running when this happens?
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Old 10-13-2021, 12:18 PM   #5
xtremewlr
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Quote:
Originally Posted by Unabomber View Post
The #1 cause of wonky idle in a Subaru: https://forums.nasioc.com/forums/sho...d.php?t=781242

Your tuner should have known this and I feel sad that he does not.
Quote:
Originally Posted by EvoZero View Post
Car is drive by wire. I changed plugs, and pcv valve today, same thing. When I changed plugs they were wet. Tuner claims my car looks fine and most likely mechanical. While coming to stop signs the idle with drop and hold at normal 950-1000, after sitting at a stop sign it'll rise.I've checked all connections and am stumped why this would happen all of a sudden.
Correct, 2006 WRX or STi doesn't have the idle air control valve to worry about. It uses a MAP sensor instead.

My 06 STi does something similar, with the idle dipping when I come to a stop light. Especially noticeable with the AC running as @BlackFighter has asked. I do not have any codes otherwise.

I'm curious if a failing or dirty MAP sensor could cause this issue? Reading @Unabomber's link, this post here leads me to think that a faulty or dirty MAP sensor could be a possible cause for the problem.

https://forums.nasioc.com/forums/sho...&postcount=530

Also be sure to check for vacuum leaks. They are notoriously hard to find. I just replaced all the rubber vacuum lines that I could find with silicone lines.
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Old 10-13-2021, 02:11 PM   #6
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I love when Ron comes in, makes his trademark snarky comment, only to be completely wrong LOL.

Just like when he came onto my post discussing turbos only to accost me for comparing dissimilar turbos, when the specific model he brought up I hadn't even mentioned in the post...

Gotta love forums man.

Last edited by K3rm1tth3fr0g; 10-13-2021 at 03:34 PM.
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Old 10-13-2021, 03:00 PM   #7
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Do you have a WBO2 sensor/gauge installed? And if so, does it coincide with the front O2 sensor?
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Old 10-13-2021, 05:36 PM   #8
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Quote:
Originally Posted by StarkWRX View Post
Do you have a WBO2 sensor/gauge installed? And if so, does it coincide with the front O2 sensor?
To everyone, AC is off, lights are off. Itís a new alternator, new battery, voltage 14-14.4v. Map sensor and build have less than 2000 miles on it. Wideband is connected to read in accessport, I havenít checked to see front o2 to match but the front o2 is brand new installed a few days ago.
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Old 10-15-2021, 02:03 PM   #9
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Bump, front o2 sensor reads the same as my wideband during warm up and idle.
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Old 10-21-2021, 02:35 AM   #10
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I am still looking for a solution. Not sure what else to do.
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Old 10-21-2021, 11:32 AM   #11
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I'm thinking you should seek out a different tuner. I agree with Unabomber in that your tuner should know what to look for or how to troubleshoot this. Your statement that he is at a loss as to what to do leads me to think he is rather inexperienced, at least with Subies.
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Old 10-21-2021, 01:17 PM   #12
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Quote:
Originally Posted by xtremewlr View Post
I'm thinking you should seek out a different tuner. I agree with Unabomber in that your tuner should know what to look for or how to troubleshoot this. Your statement that he is at a loss as to what to do leads me to think he is rather inexperienced, at least with Subies.
Iím tuned by ShinjiTuned. All the reviews said heís a great tuner which is why I chose him at the time.
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Old 10-21-2021, 04:27 PM   #13
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Quote:
Originally Posted by EvoZero View Post
Iím tuned by ShinjiTuned. All the reviews said heís a great tuner which is why I chose him at the time.
Maybe so, I have no experience with ShinjiTuned but I kinda feel that if they are supposed to be that good, they should be able to determine what you should be looking for via logs that you send them. I don't know if they use multiple tuners or if it's just one guy. I feel like the logs should be able to point you in the direction to start looking tho and your tuner should be able to help you decipher them.
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Old 10-21-2021, 08:28 PM   #14
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Quote:
Originally Posted by xtremewlr View Post
Maybe so, I have no experience with ShinjiTuned but I kinda feel that if they are supposed to be that good, they should be able to determine what you should be looking for via logs that you send them. I don't know if they use multiple tuners or if it's just one guy. I feel like the logs should be able to point you in the direction to start looking tho and your tuner should be able to help you decipher them.
Iím literally just trying to drive the car, thinking of parting it at this point.
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Old 10-21-2021, 10:26 PM   #15
K3rm1tth3fr0g
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Quote:
Originally Posted by EvoZero View Post
Iím literally just trying to drive the car, thinking of parting it at this point.
Don't part out the car. Finding intake and boost leaks and issues like this over E tuning is extremely difficult.

This is why I don't like E tuning. I suggest you find a good speciality tuning shop that is comfortable diagnosing Subarus in your area, and letting them have a crack at the car.

Good luck.
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Old 10-22-2021, 05:04 AM   #16
EvoZero
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
Don't part out the car. Finding intake and boost leaks and issues like this over E tuning is extremely difficult.

This is why I don't like E tuning. I suggest you find a good speciality tuning shop that is comfortable diagnosing Subarus in your area, and letting them have a crack at the car.

Good luck.
Thanks, shouldíve bought once, cried once lol.
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Old 10-23-2021, 12:31 AM   #17
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Update,

Pumped 91 Oct to see if things would change, same afr same idle.
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Old 10-25-2021, 09:13 PM   #18
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Did you remove your TB and clean it?
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Old 10-26-2021, 04:18 PM   #19
EvoZero
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Quote:
Originally Posted by FAFWrx View Post
Did you remove your TB and clean it?
Did that and I Fuel Induction cleaned the motor at work. I pumped 91 Oct to see if the map would change my idle issue. Brought it from E85 to E37.7. Afrs and idle speed have no changed.
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Old 10-27-2022, 04:19 PM   #20
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Quote:
Originally Posted by EvoZero View Post
Did that and I Fuel Induction cleaned the motor at work. I pumped 91 Oct to see if the map would change my idle issue. Brought it from E85 to E37.7. Afrs and idle speed have no changed.

Old post, I know. But Iím curious if you ever found the cause/fix. Iím currently having the same code issue. Any help is greatly appreciated


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Old 10-27-2022, 05:13 PM   #21
EvoZero
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Quote:
Originally Posted by lyfeofkai View Post
Old post, I know. But Iím curious if you ever found the cause/fix. Iím currently having the same code issue. Any help is greatly appreciated


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Faulty MAP sensor
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