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Old 06-19-2017, 07:30 AM   #51
Bengals8402
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has anybody on here gotten a straight answer from a dealer on this issue yet? It seems everyone has a different opinion on exactly what causes the rough idle on the new 2015+ motors
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Old 06-19-2017, 01:38 PM   #52
schwerpunkt
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Quote:
Originally Posted by Bengals8402 View Post
has anybody on here gotten a straight answer from a dealer on this issue yet? It seems everyone has a different opinion on exactly what causes the rough idle on the new 2015+ motors
The dealer had my car for 4 days and everything was in spec. I went for a drive with the tech and of course was not able to recreate it. They blamed me for using 89 octane sometimes so I'll stay with 91 or 93. Without a CEL the tech wouldn't elaborate on what it might be. I haven't had any more stalls, but I still notice jumpy idle in the mornings sometimes.
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Old 06-21-2017, 08:50 PM   #53
Bengals8402
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I only use 93 octane in mine... should I switch to 91? When at idle and I shut off the AC turn lights and radio off it makes the car idle more roughy, RPMs fluctuate from 700 to 900 almost feels like it's about to stall. As soon as I turn the AC on it seems to run more smoothly at 700 RPMs. It's been doing this since the day I got the car
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Old 06-21-2017, 10:57 PM   #54
tramp
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Why would anyone run 89 octane in any turbo'd engine let alone one with 10.6:1 mechanical compression?
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Old 06-22-2017, 12:55 PM   #55
Abismo
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Quote:
Originally Posted by tramp View Post
Why would anyone run 89 octane in any turbo'd engine let alone one with 10.6:1 mechanical compression?
some places thats the best you can get. like my ex wifes tiny ass podunk town.
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Old 06-22-2017, 11:20 PM   #56
tramp
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If that's the case a big V8 would be a better choice. And I live in a "podunk" little burg to the tune of 1300 population. And both stations have 93 octane.
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Old 06-27-2017, 04:01 PM   #57
Bengals8402
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Default Rough idle update

I have noticed that when I drive the car hard, 5,000 rpms and high boost the car idles smooth as butter. However after some normal city driving the rough idle comes back???? Strange
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Old 06-29-2017, 10:12 PM   #58
SycsFinest
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I had an issue with my MAF sensor. Dealer swapped it out for a new one and the idle is much improved. Might be something to look into
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Old 07-13-2017, 03:49 PM   #59
Bigpoppabird
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I been doing alot of research. I hsve a 2017 wrx with aftermarket ets intake perrin catback nameless muffler delete and turbo xs bov. It doesnt need a tune but at 8k miles it starts to rough idle at 500rpm even lower sometimes. Ive been told to clean the maf sensor or goto the dealer to have them reset it. I found this video and im trying it as we speak. Good luck
https://youtu.be/Ud6OU13IDSQ
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Old 07-13-2017, 04:32 PM   #60
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Quote:
Originally Posted by Bigpoppabird View Post
I been doing alot of research. I hsve a 2017 wrx with aftermarket ets intake perrin catback nameless muffler delete and turbo xs bov. It doesnt need a tune but at 8k miles it starts to rough idle at 500rpm even lower sometimes. Ive been told to clean the maf sensor or goto the dealer to have them reset it. I found this video and im trying it as we speak. Good luck
https://youtu.be/Ud6OU13IDSQ
you 100% sure about that?


try taking off the intake and putting the stock one back on...

also dont get peoples obsessions with bovs... any chance thats leaking?
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Old 09-27-2017, 02:49 PM   #61
tyember
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Just bought a new 2018 wrx and it has the same rough idle issue. Took it back on the second day to the dealership once I noticed it and had a tech look at it. He said he did not notice anything/couldn't hear a difference in the idle. He told me to let it break in and see if it goes away. From the previous replies, it seems like it will not be going away. Our best solution now for this is to get a new tune? I was planning on doing the Accessport once the 36k warranty is up, but sooner might be better.
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Old 09-27-2017, 04:09 PM   #62
Abismo
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Quote:
Originally Posted by tyember View Post
Just bought a new 2018 wrx and it has the same rough idle issue. Took it back on the second day to the dealership once I noticed it and had a tech look at it. He said he did not notice anything/couldn't hear a difference in the idle. He told me to let it break in and see if it goes away. From the previous replies, it seems like it will not be going away. Our best solution now for this is to get a new tune? I was planning on doing the Accessport once the 36k warranty is up, but sooner might be better.
You know the powertrain warranty is 5yr 60k right?
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Old 09-27-2017, 06:37 PM   #63
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Quote:
Originally Posted by whiplash willy View Post
Read through this thread, it has good info on your exact issue.

https://forums.nasioc.com/forums/sho....php?t=2798264
I replaced all 4 OCVs, cleaned my MAF, cleaned the vacuum sensor, re-flashed the protune, changed the filter, and after 10 or so miles, it came back.

My issue started around 15,000 miles, but it was some hesitation at 3000rpm. Fixed by cleaning MAF and vacuum sensor and changing filter.

Every few thousand miles, I would to through the same exercise.

It got really bad around 25,000 miles where my fix and re-flash lasted about 600 miles. And, it was a struggle after that.

I don't have a solution for you as I am getting a new motor, but I can tell you that my vlaves and pistons were pretty dirty. That would not explain a car with only 600 miles having an idle issue.
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Old 09-27-2017, 09:47 PM   #64
RakumiAzuri
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I really need to check the dates on these posts...
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Old 09-28-2017, 11:07 AM   #65
jasonwrx86
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Speaking of idle. Has anyone had issues with hot restarts like you turn car off an do something. When you come back 10 minutes later to start the car, the rpm would dip a little right after starting and then go back to normal? That's with AC on.
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Old 09-28-2017, 11:15 AM   #66
Abismo
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Quote:
Originally Posted by jasonwrx86 View Post
Speaking of idle. Has anyone had issues with hot restarts like you turn car off an do something. When you come back 10 minutes later to start the car, the rpm would dip a little right after starting and then go back to normal? That's with AC on.
I could expect this to be normal.

warm idle is lower, but ac running requires a higher idle speed.

car starts temp is warm rpm low, ac demanded rpm climbs back up.
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Old 09-29-2017, 04:32 PM   #67
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Quote:
Originally Posted by Abismo View Post
I could expect this to be normal.

warm idle is lower, but ac running requires a higher idle speed.

car starts temp is warm rpm low, ac demanded rpm climbs back up.
Yea that is normal
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Old 11-28-2017, 04:21 PM   #68
cyclops24
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I am experiencing the same intermittent rough idling issues on my 2017 WRX. I monitored the AVCS with my access port and found that when this issue happens the AVCS intake right was malfunctioning. It was showing a 36 while the left was 0. Would replacing the oil control valve part number 10921 take care of this issue? Can anyone tell me which of the oil control valves is the right intake one?
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Old 11-28-2017, 07:53 PM   #69
fredrik94087
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Quote:
Originally Posted by cyclops24 View Post
I am experiencing the same intermittent rough idling issues on my 2017 WRX. I monitored the AVCS with my access port and found that when this issue happens the AVCS intake right was malfunctioning. It was showing a 36 while the left was 0. Would replacing the oil control valve part number 10921 take care of this issue? Can anyone tell me which of the oil control valves is the right intake one?
All 4 OCVs are the same.
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Old 11-28-2017, 11:18 PM   #70
Leosfo
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2015 WRX 48K miles has had random rough idle since purchase new. Never has stalled. Saving up for an AP and new tune see wha t that does...
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Old 11-29-2017, 01:48 PM   #71
cyclops24
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I know they are all the same but I'm not going to replace all four if only one of them is not operating properly. So what I'm trying to ask is can anyone tell me which of the four is the right intake OCV? I want to try replacing that first and see if it corrects the issue.
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