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Old 12-05-2018, 08:18 PM   #1
Scooby Newbie
Member#: 494082
Join Date: Nov 2018
Chapter/Region: MWSOC
Location: colorado
2003 wrx

Default strange white-ish smoke?

Ok gurus, 03 wrx 2.5 block 2.0 heads......all stock minus very conservative tune like still 0.5 bar boost (mile high altitude)......today leaving work started the car let it idle for a few mins cause its cold outside went to back out of the parking spot and noticed a substantial amount of smoke from exhaust......car seems to run fine no CEL or anything doesnt smoke while driving even at WOT? I do know i have valve cover gasket leak on right side and my td04 blow dryer is getting old but just want to get other opinions on the issue before i call it something and find out later rings are shot or something ya know......will do compression and leak down test this weekend and post results.
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Old 12-31-2018, 12:13 AM   #2
Scooby Newbie
Member#: 484841
Join Date: Apr 2018
Chapter/Region: MAIC
Location: Maryland
2008 WRX STI
Lightning Red


Its probably coolant.
slow.wagon is offline   Reply With Quote
Old 01-01-2019, 10:03 AM   #3
Scooby Newbie
Member#: 492422
Join Date: Oct 2018

Possible head gasket? Pressure test the cooling system and see. Also if you doing a compression test and notice bubbles in the coolant tank, then you know you have a headgasket leak.
Jay11STI is offline   Reply With Quote
Old 01-01-2019, 01:01 PM   #4
NASIOC Supporter
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT


Sigh........cool and damp......best guess.....condensation from inside the exhaust.

White smoke, dissipates fast......water.....normal.
Blue, dissipates sorta fast.....likely oil. Could be rings, valve seals, etc.
Black, dissipates whenever.....likely rich, check AFR's.

Bad HG that is leaking coolant, exhaust sorta has a sweet smell that is always there.
Condensation in the exhaust usually goes away once the exhaust is hot.

Really? This is sorta engine mechanics 101......

Maybe give more info, maybe something else......then we can give better info.......

As to bad HG, I have been through quite a few Subaru that failed.......cooling pressure tester does NOT bring the pressure up enough to find a minor leak.
A compression test (or, even leakdown) will normally NOT show a bad HG.

I have a "nuts and bolts" thread on how to use a cooling system pressure tester to find a potential HG leak. Do advanced search, my username, nuts and bolts.
Maybe not as good as Unabomber, but worthwhile......
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