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Old 08-24-2009, 03:14 PM   #1
DigitalPunk
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Member#: 124236
Join Date: Aug 2006
Chapter/Region: SWIC
Location: Albuquerque
Vehicle:
2006 WRX Built EJ257
Version 8 Twinscroll

Default White smoke problem

i'm hoping someone on here can give me insight on some of the possibilities of the white smoke coming from my exhaust.

first the relevant mods:

ej257 long block
100mm cp pistons
oem rods, crank
tomei main, rod bearings
USED vf37 twin scroll turbo
tgv deletes
air pump delete
SS oil feed line

there was no smoke since i have been driving the car with 0 miles for the last 3 weeks. this morning, after a cool night with car parked in the garage, i started the car and noticed a moderate amount of white smoke coming from the exhaust. after the car has reached warm-up, considering this is not operating temps, the car continues to smoke on occasionally. after a light 10 minute drive the smoke stops. after letting it cool down for 30-45 minutes and starting it back up, there is still no smoke.

where did this white smoke come from?

edit: the v8 twin scroll turbo setup moved my main o2 sensor to the bell mouth of the downpipe. i have a CEL that says the o2 sensor is bad and that i'm running lean.
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Old 08-24-2009, 03:28 PM   #2
seanathanq83
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Location: Houston, Tx
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2002 s256 twinscroll
now with one more gear

Default

did the smoke smell like coolant? do you have any cats? some cars that are catless will smoke on start up, mine smokes some ( realy its just buring off water our of the straight pipe ) as for your o2 i am not sure i dont have any problems with mine, it all worked great. do you have a wide band?
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Old 08-24-2009, 03:28 PM   #3
sjobing
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This might be a headgasket that's on it way to blow.

This can cause that some water from the cooling system are getting into your exhaust and make the white smoke.

It can also be the turbo laeking water into the exhaust.

So first thing to do: check if you are missing some cooling liquid.
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Old 08-24-2009, 03:43 PM   #4
DigitalPunk
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2006 WRX Built EJ257
Version 8 Twinscroll

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i do not have a wideband but i plan on getting one once the finances come in. i am also catless right now.
will the wideband be able to give me a better diagnosis?
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Old 08-24-2009, 03:48 PM   #5
seanathanq83
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now with one more gear

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yes, it will tell you what your A/F really is and make tuning so much easier
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Old 08-25-2009, 12:46 AM   #6
801_STi
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Default

it could just be condensation.

or it could be blow head gasket, burning coolant...

if the smoke has a blue tint it is something with oil..

just make sure you let the car warm up and cool down when you drive it and see if the smoke persists. if so, then start worrying
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Old 08-25-2009, 11:12 AM   #7
DigitalPunk
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Version 8 Twinscroll

Default

Quote:
Originally Posted by 801_STi View Post
it could just be condensation.

or it could be blow head gasket, burning coolant...

if the smoke has a blue tint it is something with oil..

just make sure you let the car warm up and cool down when you drive it and see if the smoke persists. if so, then start worrying
the smoke completely stops after a short drive and does not come back for the rest of the day. it did rain for the first time the night before and morning of the smoking. perhaps it is only condensation. i hope.
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Old 08-25-2009, 11:24 AM   #8
801_STi
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swp sti "Pearl"

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most likely condesation then. dont worry about it.
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Old 08-25-2009, 01:41 PM   #9
Charlie-III
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Quote:
Originally Posted by 801_STi View Post
Most likely condensation then, don't worry about it.
+1. It's likely not "smoke", it's steam from boiling off the condensation inside the exhaust pipe. You will notice some cars dripping out of the exhaust on cool mornings, this is also condensation.

If it's a HG, it will likely smell "sweet" and you will have coolant loss.
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Old 08-25-2009, 02:54 PM   #10
DigitalPunk
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Version 8 Twinscroll

Default

good stuff to know. it rained again this morning and last night. same symptoms. warmed her up, drove her up the street and no more smoke.
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Old 08-26-2009, 10:04 AM   #11
bluescoobywagon
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Not A Wagon!
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The easiest way to tell the difference between oil and steam is that the steam will dissipate pretty rapidly, while burning oil will linger (and smell like burning oil). If it only burns oil on initial startup after sitting for a while, it's usually a bad valve stem seal.
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