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03-24-2013, 01:59 PM | #1 |
Scooby Newbie
Member#: 339966
Join Date: Dec 2012
Chapter/Region:
NESIC
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Smoking
Just recently I noticed gray-ish smoke from the exhaust, from what I can tell it only smokes at idle. Sometimes a little, and sometimes its pretty bad. If I let it idle for about 30 seconds then give it some throttle you can clearly see its blue. I have not noticed any consumption. I did replace the entire PCV assembly, no change. Very small amount of oil in the intercooler. My next step is to check the turbo hot side. Bottom end and turbo were replaced <20k ago, also heads were refreshed.
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Last edited by allfours; 05-28-2013 at 09:30 PM. |
03-24-2013, 02:33 PM | #2 |
Scooby Specialist
Member#: 151045
Join Date: Jun 2007
Location: Pennsylvania
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I would look closer at the turbo--especially since you mentioned a spun rod bearing. The turbo would experience the same oil starvation as the crank.
If you think it's the head gasket then do a compression test and cross your fingers. |
03-24-2013, 02:53 PM | #3 |
Scooby Newbie
Member#: 339966
Join Date: Dec 2012
Chapter/Region:
NESIC
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Turbo was replaced and oil lines cleaned thoroughly. I have a combustion leak detector, would this rule out a head gasket if it passes?
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03-25-2013, 08:35 AM | #4 |
Former Vendor
Member#: 301037
Join Date: Nov 2011
Chapter/Region:
MWSOC
Location: Minneapolis, MN
Vehicle:2004 Forester XT Aspen White |
Did you replace the oil cooler when you did the rebuild?
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03-25-2013, 07:00 PM | #5 |
Sammo Hung
Moderator Member#: 10613
Join Date: Sep 2001
Chapter/Region:
South East
Location: N Fla / S Ga
Vehicle:2002 USDM WRX WRB |
pcv is first place to start.
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03-25-2013, 10:15 PM | #6 |
Scooby Newbie
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TXIC
Location: mcallen, texas
Vehicle:2003 impreza wrx wr bp |
did you redo the block as in pistons and rings?
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03-29-2013, 12:39 PM | #7 |
Scooby Newbie
Member#: 339966
Join Date: Dec 2012
Chapter/Region:
NESIC
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No brand new bottom end. Did a leak down, results were good. Replaced the pcv and the smoking was virtually gone.
I have one more issue now though. After I drive the car and do not let it fully cool off before I drive it again. It will run rich just cruising around in the 13.5 - 8 range. After a few minutes it goes back to normal. Could that be a bad front 02? |
03-29-2013, 04:45 PM | #8 | |
Scooby Guru
Member#: 82745
Join Date: Mar 2005
Chapter/Region:
SCIC
Location: So Cal
Vehicle:2005 Subaru STI 2003 EJ207 S204 Wagon |
Quote:
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03-29-2013, 06:13 PM | #9 | |
Scooby Newbie
Member#: 339966
Join Date: Dec 2012
Chapter/Region:
NESIC
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Quote:
http://www.trademotion.com/parts/200...xygen%20sensor |
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03-29-2013, 09:32 PM | #10 | |
Scooby Guru
Member#: 82745
Join Date: Mar 2005
Chapter/Region:
SCIC
Location: So Cal
Vehicle:2005 Subaru STI 2003 EJ207 S204 Wagon |
Quote:
You can buy the Denso version for about a $100 less through amazon. Just look up the part # through the Denso website. It's the exact same sensor as the one Subaru sells (repackages and sells to us for about double the price). |
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04-22-2013, 05:56 PM | #11 |
Scooby Newbie
Member#: 339966
Join Date: Dec 2012
Chapter/Region:
NESIC
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Back again with the same issue. I usually back up my driveway, today I pulled in. Walked around the car and noticed whitish smoke coming from the exhaust. Shut it off. Went back outside maybe 10 minutes later to start it up again. Whiteish smoke coming from the exhaust, not pouring out. Gave it a couple revs and white smoke starts pouring out of the exhaust. I look inside the exhaust and you can see water building up. I never noticed this until I got pro tuned and had a catless up pipe installed. Could that lack of the up pipe cat cause excessive condensation? Coolant level is fine and I never have to add oil during my 4k OCI's.
Also let me add, I see absolutely no smoke on the first startup after its been sitting in the morning. After its been running for about 30 seconds you will see condensation though. I really hope its not the valve stem seals seeing they have less than 20k on them. |
04-22-2013, 07:20 PM | #12 |
Scooby Newbie
Member#: 344639
Join Date: Jan 2013
Location: East Coast
Vehicle:2002 Impreza WRX Midnight Black Pearl |
One clue, it could be a bad head gasket is, puffs of smoke from radiator.
Take off radiator cap, start car, step on accelerator a few times. Does the water bubble up on acceleration and/or puffs of white smoke? Next do a combustion leak detector blue liquid test for $21.24 part number LIS75500. The blue liquid turns yellow if it has a bad head gasket. my2cents |
04-23-2013, 05:45 PM | #13 | |
Scooby Newbie
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Join Date: Dec 2012
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Quote:
If I put my hand about 4 inches into the exhaust I can feel water building up on my hand. |
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04-23-2013, 07:42 PM | #14 |
Scooby Newbie
Member#: 339966
Join Date: Dec 2012
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Burped the coolant system, got it to the point where it was not over flowing. Although when I give it some revs the coolant starts to overflow, which seems like its normal to me.
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04-23-2013, 09:19 PM | #15 |
Scooby Newbie
Member#: 344639
Join Date: Jan 2013
Location: East Coast
Vehicle:2002 Impreza WRX Midnight Black Pearl |
Take a look at youtube vids on white smoke and let us know which one is what you see.
Some are HG or valve seals if it happens at start up only and others are turbo seals. Oil in down pipe is clue of turbo seals. my2cents. |
05-28-2013, 08:54 PM | #16 |
Scooby Newbie
Member#: 357768
Join Date: May 2013
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New member, 05 built STI going down freeway today all of a sudden white smoke pouring out of tail pipe.
We will see tomorrow what mechanic says. |
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