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Old 10-23-2018, 02:05 PM   #1
DrFunk
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Member#: 492774
Join Date: Oct 2018
Default 2018 wrx issues after cold weather hit

Iv had some issues with my car beginning with the first day It got cold about a week and a half ago. It started with a really rough idle, But after letting it warm up and beginning to drive it around it started running either super rich or lean, getting around 8-10 mpg at best and periodically dying at idle while also having instances of power loss where the engine would bog down and almost die when driving around. The AF correction value on my accessport was all over the place from -70% to +34%. There was also no abnormal knock during any of these instances.

https://imgur.com/JjvYWRs
video of it where you can hear the engine dying a little in the background.

Mods are
- 3" turboback exhaust
- ETS intake
- Grimmspeed TMIC
- Grimmspeed charge pipe
- 3 port boost control solenoid
- TGV/EGR delete
- Cobb accessport
- Perrin solid shift bushing
- Kartboy short shift plate/ shift stop
- weighted shift knob

Iv been out of town for a while and haven't been able to mess with anything yet, but I want to have a look at it today. Could it be as simple as the intake being clogged which could have happened from driving in a little snow, or is it likely something else. I come from the south and this is kinda my first experiencing with cold so Im not really knowledgeable about engine issues that can come from it.

The weather has also got warmer since and resetting the ecu did not change the problem at all.
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Last edited by DrFunk; 10-23-2018 at 04:12 PM.
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Old 10-23-2018, 02:38 PM   #2
CGumina
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Chapter/Region: Tri-State
Location: Rochester, NY
Vehicle:
2015 WRX
Crystal White

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So, what tune is in it?
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Old 10-23-2018, 04:12 PM   #3
DrFunk
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Quote:
Originally Posted by CGumina View Post
So, what tune is in it?
I got a protune a month or so back, haven't had any issues till now.
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Old 10-23-2018, 06:03 PM   #4
shtfuq
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When I got my tune, I had a rough start during startup and idle. The tuner turned off stratified start and the problems seemed to go away for startup. I'm unsure about the other issues though- have you tried cleaning your MAF sensor?
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Old 10-23-2018, 06:41 PM   #5
tegxsi
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Location: East Bay, CA
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I'm guessing you have some sort of vacuum/boost leak since your fuel trims are swinging all over the place...Is -70% even possible?! lol
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Old 10-23-2018, 06:45 PM   #6
Perscitus
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Chapter/Region: Tri-State
Location: Blue Hole
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Yup it is on the FA series NA or FI motors. BRZ, WRX, FXT, Levorg, Ascent, Legacy DIT etc
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Old 10-23-2018, 08:03 PM   #7
Straight6
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Quote:
Originally Posted by shtfuq View Post
When I got my tune, I had a rough start during startup and idle. The tuner turned off stratified start and the problems seemed to go away for startup. I'm unsure about the other issues though- have you tried cleaning your MAF sensor?
I had the same issue and had the stratified start disabled and while it fixed the rough idle, now I have the chain rattle on cold starts. So annoying. .
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Old 10-24-2018, 10:47 AM   #8
X49
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Join Date: Apr 2014
Location: Western Canada
Vehicle:
2015 WRX

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Quote:
Originally Posted by Straight6 View Post
I had the same issue and had the stratified start disabled and while it fixed the rough idle, now I have the chain rattle on cold starts. So annoying. .
Get your tuner to modify your Idle Ignition Timing vs RPM tables. This will keep the revs down on engine start and eliminate the rattle. There seems to be a hidden airflow target the engine uses on start, and since homogeneous fueling is more efficient, it results in higher revs. Changing idle ignition timing at 1700rpm+ to -7 degrees should do the trick.
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Old 10-24-2018, 01:21 PM   #9
DrFunk
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Quote:
Originally Posted by shtfuq View Post
When I got my tune, I had a rough start during startup and idle. The tuner turned off stratified start and the problems seemed to go away for startup. I'm unsure about the other issues though- have you tried cleaning your MAF sensor?
The MAF sensor is clean I just checked it, aside from a boost leak, could it maybe be a fuel filter that needs to be changed?
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Old 10-24-2018, 05:39 PM   #10
tegxsi
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I don't think these cars have filters other than the white strainer "sock" at the bottom of the fuel tank.
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Old 10-24-2018, 07:10 PM   #11
DrFunk
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Quote:
Originally Posted by tegxsi View Post
I don't think these cars have filters other than the white strainer "sock" at the bottom of the fuel tank.
Yep, and that ones a bit of a pain to get to. besides that shouldn't be clogged at 20k. Probably going to check as best I can for any type of boost leak and bring it in for actual testing if that doesnt yield anything.
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