Welcome to the North American Subaru Impreza Owners Club Wednesday February 26, 2020
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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 02-10-2020, 04:23 AM   #1
SubieDude23
Scooby Newbie
 
Member#: 456268
Join Date: Oct 2016
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2006 WRX
Silver

Default IAG Street AOS, Puff of Oil Smoke on Cold Start

Hey guys,

Lately I've had this strange issue where my car puffs a cloud of what looks to be blue oil smoke. It smells like burnt oil and confirms my suspicions. I pulled my turbo the other day and say a pool of oil on the turbo compressor inlet and on the intake tube. The intercooler had a bit of pooling oil too. I assume this pooled oil in the turbo gets sucked through the turbo/engine and puffs oily smoke on cold starts.

I was wondering if anyone has experienced issue and if there was a fix.

I've been running the IAG AOS for a few years now and I've been noticing this has been happening more frequently lately. The car still runs awesome, but cranking it in public places can be a bit embarrassing. Thanks for the help.
* Registered users of the site do not see these ads.
SubieDude23 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 02-10-2020, 09:58 AM   #2
Turpid Porpoise
Scooby Specialist
 
Member#: 476573
Join Date: Oct 2017
Chapter/Region: MAIC
Location: Lovettsville, Virginia
Vehicle:
2008 Impreza WRX STi
Silver

Default

Sounds like valve seals to me.
Turpid Porpoise is offline   Reply With Quote
Old 02-11-2020, 03:18 AM   #3
SubieDude23
Scooby Newbie
 
Member#: 456268
Join Date: Oct 2016
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2006 WRX
Silver

Default

I actually changed them when I built the engine about 20k miles ago
SubieDude23 is offline   Reply With Quote
Old 02-11-2020, 07:53 AM   #4
KillerBMotorsport
NASIOC Vendor
 
Member#: 198281
Join Date: Dec 2008
Chapter/Region: MAIC
Location: Virginia
Vehicle:
2005 WRX/STi
WRB of course

Default

If this has been happening more frequently lately, it sounds like something has happened internally.

As an example... a ring land failure can give occasional symptoms. One of which is occasional smoke on startup. PVC system, turbo oil seals, I would suspect as well. Some detective work and you can follow the oil. It is coming from PCV lanes into the inlet, or burping out of the compressor. If you can get eyes on the turbo inlet, you should be able to get a direction to go in.
KillerBMotorsport is offline   Reply With Quote
Old 02-11-2020, 08:55 AM   #5
Brother EddieJ.
Scooby Specialist
 
Member#: 181617
Join Date: Jun 2008
Chapter/Region: MAIC
Location: frederick, md
Vehicle:
2004 wrx
Dom3/IAG built hybrid

Default

This happened to me. Exact same thing. Only go worse as the days went on. Piston ring failure. I had 330whp and 300wtq on my 2.0 for 147k miles. Try a leak down and compression test(both wet and dry). Could be valve seals or turbo slowly dying but who knows until those two tests are done. You might even be able to tell just looking at the spark plugs
Brother EddieJ. is offline   Reply With Quote
Old 02-11-2020, 11:08 AM   #6
Turpid Porpoise
Scooby Specialist
 
Member#: 476573
Join Date: Oct 2017
Chapter/Region: MAIC
Location: Lovettsville, Virginia
Vehicle:
2008 Impreza WRX STi
Silver

Default

Try running the engine with the oil cap off and check for smoke. Then get a compression and leak down test to properly diagnose your issue.
Turpid Porpoise 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 04:21 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2020 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.