Go Back   Subaru Impreza Forum - WRX STI Rally Performance Tuning > Subaru Impreza Technical Area > Technical General

Subaru Impreza Forum

white smoke from crankcase breather
Reply
 
LinkBack Thread Tools Display Modes
Old 01 Mar 2009, 08:52 PM   #1 (permalink)
Fresh Scooby
 
Join Date: Aug 2007
Posts: 6
white smoke from crankcase breather

hi guys

hoping you all can provide some useful comments, and hoping that it's not the inevitable.

I have an STi 6, with aftermarket rotated turbo and FMIC. Have white smoke blowing out of the crankcase breather this morning. This is how it happened:

Battery was flat so i jump start the car with a battery pack. Let it idle for a good 3 - 5 minutes while i was packing my laptop and few other bits in. Drove 100m to the petrol station, had the car idling while they were filling in fuel (i know, this is not too safe ) Total time was about 15 mins from startup, car was idling for all except the 100m to filling station.

Then drove away from the fuel station and got into boost in 1st gear, think it hit 1.1 bar, changed gear at 5,000rpm. Came to a standstill (another 100m on) and noticed smoke (like steam) blowing out of the bonnet scoop. When sitting in the car, the smoke looked like it was coming out from the left side of the car. Popped open the bonnet and could not see any oil, nor where the smoke was coming from.

Closed up and then carried on driving slowly on a 24km highway drive to work. Car seemed to be driving fine and no indicaiton of power loss, or erratic behaviour. Timing was fine, no misfires. Exterior temps around 22Celsius, with moderate humidity. Car temps looked fine.


Then noticed that under boost there was more of the same smoke i noticed earlier. When i got to my destination i opened the bonnet and this time the car was struggling to idle, wanting to switch off. I noticed the smoke coming from the driver's side of teh car, from a breather pipe that is close to #3 cylinder.
No smoke coming out the exhaust.
Now there was some oil around the block area just aruond the breather pipe.

Nursed the car home driving off boost, heater on full blast. When the car came to a complete stop, more white smoke coming out the breather and struggling to idle on its own.

While cruising the car home, it showed no real sign of major deterioration though, as the engine note was still the same and no misfires.

THIS IS NOT A PICTURE OF MY CAR, I'VE JUST USED SOMEBODY ELSE'S PIC AS AN EXAMPLE


The breather i am talking about - in the pic above if you look at the brass nut on the left of the pic at the back of the block, there is a breather pipe that is just a little bit further to the left towards the turbo, and where the head would meet the block (just out of sight in the pic).

So i've had a read through these threads already
STi7 blowing excessive oil into inlet path.... [Archive] - ScoobyNet
Smoke coming from the engine. Should I be seriously worried? [Archive] - ScoobyNet
Scoobysport manifold, leaking crankcase and heat wrap fun [Archive] - ScoobyNet
Startup Smoke [Archive] - ScoobyNet

not all the same as my problem, but all indications are that i've got combustion getting past the rings and into the crankcase?

What are my options now? Open the engine and replace pistons and rings? Most likely any other damage? I've never encountered this problem with Subarus before, so any constructive comments are welcome.

(I've previously run the bearings on cyl #3 and come acorss that problem a lot when searching for info)

hoping for the best
Offline   Reply With Quote
Reply

Bookmarks

Tags
crankcase, white smoke


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
White Smoke ..... Help ? delboy at 10 Engine Bay 4 15 Feb 2008 04:45 PM
Clouds of white smoke in rear view mirror..... chur1996 Technical General 11 09 Aug 2007 11:33 AM
sunday m5 white skyline, james bond smoke screen richymotor General Chat - Anything about Anything 0 24 Feb 2006 08:58 AM
White smoke after octane boost skylight Subaru Impreza Discussions 10 26 Apr 2004 07:05 AM


All times are GMT. The time now is 10:58 PM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.