Welcome to the North American Subaru Impreza Owners Club Tuesday July 23, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > FB Series Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 04-10-2023, 10:49 PM   #1
cernst
Scooby Newbie
 
Member#: 392376
Join Date: Jun 2014
Location: STL, MO
Vehicle:
2014 Impreza Limited
Blue

Default intermittent Stuttering/Skipping

2014 FB20 with 138k miles.

I replaced the valve control body in the CVT last summer at about 125k due to the torque converter lockup solenoid going out, throwing a code. That went well.

Over the winter, I had some stuttering and an occasional check engine light for a misfire on #3 that would come and go.

All of a sudden, the stuttering came back, but no code. Used a cheap bluetooth reader to look at the "test results"...looking at the misfire counters, there was a handful on 3 again. I've been late on the last round of spark plug changes, so I changed the plugs out. while I did that, I swapped the #3 and #1 coil packs. On the test drive, drove great. HOWEVER, when I changed out the plugs, there was a ton of oil in #1 and some in #3. #2 and #4 had sticky threads... I'm usually missing about a quart of oil every 7.5k miles, which I don't think is excessive.

After the change, I'm still getting occasional stuttering. Today wife said it was bad, so I scanned the test results again. #3 had 5 misfires and #1 had 1.

So I have a few thoughts. Could be bad coil since the majority of misfires traveled from cyl 3 to cyl 1. Could excessive oil cause misfires? Could the super low misfire count be irrelevant and and could actually be a valve/solenoid in the tranny fluttering? hoping someone has some experience.

we are looking to replace a vehicle this year and I'm seriously giving this the eyeball. My other is an 07 Outlander with 281k...is in great shape.
* Registered users of the site do not see these ads.
cernst is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 04-10-2023, 11:44 PM   #2
19std
Scooby Specialist
 
Member#: 510366
Join Date: Jan 2020
Default

If you have a 2014 impreza, there may have been a valve train recall on it.

I had a 2012 with recall or tsb with the causes for oil in plugs but none of the symptoms.

https://mechanicbase.com/engine/oil-on-spark-plugs/

Anyway took it in and it stopped drinking oil after whatever they did to the valve train. Work warrantied for 1yr, don't know what that really means, but if it stopped running I was definitely going to try to blame them lol.

Look up recalls or tsbs from the ntsb, nhtsa or whatever other politburo monitors these things, put in your vin and see if you hit the Powerball. This is irrespective of mileage, dealership won't even fight you on this as they get paid by soa....

When they have your block cracked, they'll claim that everything is broken and you'll have to pay to have it fixed out of pocket, politely decline or tell them to shove it, and ask for the car back how it drove in.

Little bit of a gamble here, but my car at 180k+ now, definitely ran better after whatever they did and i declined to pay 1or 2k, can't remember, for whatever they said was broken, again can't remember.

GL

Last edited by 19std; 04-10-2023 at 11:57 PM.
19std is offline   Reply With Quote
Old 04-24-2023, 07:18 PM   #3
CaptainSlowbaru
Scooby Newbie
 
Member#: 445600
Join Date: Apr 2016
Chapter/Region: Tri-State
Location: SE PA
Vehicle:
2002 Outback Sport
Green

Default

Any oil in the plug area can easily cause a misfire. The fix for that is a valve cover replacement. I've also seen coils go bad: pull either cylinder 1 or 3 (or both) and pull the boot off the coil body. Check to see if there is any damage to the coil body from leaking spark. If the boots are just soaked in oil, the leak is most likely the issue.

What plugs did you use? NGK I hope?

Make sure the valve spring recall has been done, if your car is eligible- 2014 is the last year for the recall, so depending on your build date it may not get it.

Did you perform an AT relearn after replacing the valve body? I wouldn't suspect the transmission to be causing your issue though.
CaptainSlowbaru is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 03:52 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.