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Old 12-31-2021, 01:05 PM   #1
STiWanabe
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Default 2015 WRX manual, stock. Stalling

Like the title says, bone stock 2015 wrx. Manual trans. Drives completely normal. No codes stored ever. Stalls just about every single time I come to a stop. Restarts immediately and runs fine until I come to a stop again.
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Old 12-31-2021, 01:42 PM   #2
chris0809
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Previous owner must have converted it to a hybrid somehow
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Old 12-31-2021, 10:34 PM   #3
rexster
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Might be a boost/vacuum line has come loose. Disconnect the MAF sensor on the intake and see if it idles better. If it does, check the boost/vacuum lines near the turbo inlet/blow off valve area, and there are some other lines off the intake manifold that can come off.
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Old 01-02-2022, 11:56 AM   #4
jrgiza
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my 2016 6MT does something similar, has for a couple years. Often when I slow to a stop it nearly stalls, but doesn't quite get there, corrects itself, and I'm fine. Its actually been a lot better (though still occasionally happens) with the Accessport flashed.
Anyway just watching this to see what may be an issue for me.
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Old 01-02-2022, 06:05 PM   #5
JoeRice
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Try searching for the thread on cleaning the idle air control valve. Supposedly a common issue and symptoms seen right.
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Old 01-02-2022, 10:00 PM   #6
STiWanabe
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Quote:
Originally Posted by JoeRice View Post
Try searching for the thread on cleaning the idle air control valve. Supposedly a common issue and symptoms seen right.
My first thought was possibly a gummed up throttle body. This is my first fa subaru. I've had a million EJs. I figured they would have eliminated the iacv by now and integrated its function into the throttle body like so many manufacturers have done about 10-15 years ago.

Last edited by STiWanabe; 01-05-2022 at 12:00 AM.
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Old 01-09-2022, 07:52 PM   #7
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Thought I'd post an update. As I suspected, there is no iacv on this motor. However the the throttle body was extremely gummed up. I cleaned the hell out of it and the stalling is completely gone.
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Old 01-19-2022, 01:18 PM   #8
AMBOTTUNED
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You have an air leak somewhere
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Old 01-21-2022, 12:49 PM   #9
STiWanabe
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Quote:
Originally Posted by AMBOTTUNED View Post
You have an air leak somewhere
See the post above yours. I already completely fixed the issues by cleaning out the throttle body.
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Old 01-26-2022, 01:26 PM   #10
jrgiza
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Quote:
Originally Posted by STiWanabe View Post
Thought I'd post an update. As I suspected, there is no iacv on this motor. However the the throttle body was extremely gummed up. I cleaned the hell out of it and the stalling is completely gone.
Just wanted to say thanks for this update. Had the dealership do the fuel induction service (the spray stuff) for $135, and it's like a whole different car. near-stalling is gone and acceleration is much smoother. 69k miles on the car, probably should have been done sooner, 60k service maybe?

ya I know, I had the dealership do something easy. But as a single dad with a full time job and a house, I couldn't find time to do it myself, and I was in for a free oil change anyway.
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Old 01-27-2022, 12:57 PM   #11
STiWanabe
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Quote:
Originally Posted by jrgiza View Post
Just wanted to say thanks for this update. Had the dealership do the fuel induction service (the spray stuff) for $135, and it's like a whole different car. near-stalling is gone and acceleration is much smoother. 69k miles on the car, probably should have been done sooner, 60k service maybe?

ya I know, I had the dealership do something easy. But as a single dad with a full time job and a house, I couldn't find time to do it myself, and I was in for a free oil change anyway.
NP. I've been working in GM dealerships for 15 years and some of the "snake oil", as some call it, actually works!
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Old 02-06-2022, 03:15 PM   #12
Crazy8118
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Just an FYI, 99% of engines with a digitally controlled throttle body don't have an IAC/ISC. There is no need as the computer can control the throttle body to control air input. Unlike a cable controlled throttle body. Which the computer has no control over.
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