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14 Posts
Hey Guys,
I've been trying to track down this issue and have I've no luck discovering what it is. I can't even get my tuning shop to give me a call back and work toward a resolution either, so I'm hopeful someone has some insight.
I just got my 2017 STI tuned, and there were no issues with it on the dyno. Tune came out great, except for when I got it home the next morning and realized that it has a cold start stumble every morning now. It only happens when it's cold for some reason. The car starts up perfect, idle is great, then literally after 20-22 seconds, the car bogs down and it nearly dies. This goes on for about 3-5 seconds, then the car corrects itself, and it goes back to idling perfectly fine. Hot idle is perfect. Drivability is great. Car made great power. No other issues or CELs with the vehicle. No idea what's causing this.
I have seen a few other random references to this same issue on 2016-2018 model STIs for some reason. I don't know if this is a change in the ECU or how they are tuned? Anyone have any ideas? I'm suspecting this has something to do with the TGV delete, but, those have been being removed on these engines for how many years now without issue. I have also verified the functionality of the stock baro sensor - it is still plugged in and working.
Car has only 10k miles on it, and runs only 93 fuel, compression test came out great when I checked it. Mod list as follows: IAG air pump delete, IAG tgv delete, Cobb intake + box, Cobb turbo inlet, Cobb upppe, Cobb downpipe + full catback exhaust, Perrin EHL, Cobb EBCS, Cobb 20g turbo, Cobb fuel rails, Cobb fuel injectors (1050), Cobb FPR kit, Cobb parallel fuel line kit, AEM fuel pump, Cobb AOS, and Cobb FMIC. I think that's about it.
Assuming I can even manage to get ahold of them, can I somehow get my tuner to unlock my map so I can maybe find anther tuner to look at it? This is my first Subaru since my old 2004 WRX (which was open source). A lot has changed since my last experience.
Thanks in advance. Appreciate it.
I've been trying to track down this issue and have I've no luck discovering what it is. I can't even get my tuning shop to give me a call back and work toward a resolution either, so I'm hopeful someone has some insight.
I just got my 2017 STI tuned, and there were no issues with it on the dyno. Tune came out great, except for when I got it home the next morning and realized that it has a cold start stumble every morning now. It only happens when it's cold for some reason. The car starts up perfect, idle is great, then literally after 20-22 seconds, the car bogs down and it nearly dies. This goes on for about 3-5 seconds, then the car corrects itself, and it goes back to idling perfectly fine. Hot idle is perfect. Drivability is great. Car made great power. No other issues or CELs with the vehicle. No idea what's causing this.
I have seen a few other random references to this same issue on 2016-2018 model STIs for some reason. I don't know if this is a change in the ECU or how they are tuned? Anyone have any ideas? I'm suspecting this has something to do with the TGV delete, but, those have been being removed on these engines for how many years now without issue. I have also verified the functionality of the stock baro sensor - it is still plugged in and working.
Car has only 10k miles on it, and runs only 93 fuel, compression test came out great when I checked it. Mod list as follows: IAG air pump delete, IAG tgv delete, Cobb intake + box, Cobb turbo inlet, Cobb upppe, Cobb downpipe + full catback exhaust, Perrin EHL, Cobb EBCS, Cobb 20g turbo, Cobb fuel rails, Cobb fuel injectors (1050), Cobb FPR kit, Cobb parallel fuel line kit, AEM fuel pump, Cobb AOS, and Cobb FMIC. I think that's about it.
Assuming I can even manage to get ahold of them, can I somehow get my tuner to unlock my map so I can maybe find anther tuner to look at it? This is my first Subaru since my old 2004 WRX (which was open source). A lot has changed since my last experience.
Thanks in advance. Appreciate it.