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Blowing smoke when cold? #4606635
12/17/17 09:00 PM
12/17/17 09:00 PM
Joined: Apr 2015
Posts: 385
Reunion Island
Superflan Offline OP
Superflan  Offline OP
Joined: Apr 2015
Posts: 385
Reunion Island
Hi,

I noticed something curious on my wifeís car (Koleos in sig):

Every morning, she starts the car (flat surface), put the vehicle in gear (6 speed AT, torque converter) and climbs the 100 meters, 35 degrees uphill that leads to the road.

About 20 meters after the beginning, the tail pipe starts to blow a fair amount of something opaque, canít tell if itís blue or gray, but itís not heavy (it dissipates quickly). Of course, after climbing, it stops to blow.

What is this smoke? When I saw my brother in law climb with my Yaris, I noticed some smoke too but it smelled like ultra rich cold exhaust fumes.

Ambient temp: 70-80 For


Peugeot Partner 1.9 D, 5W40 C3, 245000 Km, running on WVO
Wife's Mitsubishi Outlander PHEV, dealerís overfilled, 16000 Km
Re: Blowing smoke when cold? [Re: Superflan] #4606657
12/17/17 09:27 PM
12/17/17 09:27 PM
Joined: Sep 2015
Posts: 5,846
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,846
Kalifornia Kollective
Likely water vapor if it dissipates. Actual smoke will hang around, smell oily and be blue'ish ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Blowing smoke when cold? [Re: Superflan] #4606854
12/18/17 02:01 AM
12/18/17 02:01 AM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline
Joined: Sep 2010
Posts: 7,485
S California
Wait at the spot where the smoke appears. I think you'll be able to figure it out. Like BrocLuno posted, it's probably water vapor.

Re: Blowing smoke when cold? [Re: Superflan] #4606866
12/18/17 03:26 AM
12/18/17 03:26 AM
Joined: Dec 2017
Posts: 59
New York City
ThankYouma Offline
ThankYouma  Offline
Joined: Dec 2017
Posts: 59
New York City
If it stops, that's gonna be harmless smoke of some sort. Cold will allow smoke to hang around for quite some time, depending. Water can and will drip out a tailpipe due to condensation. Hot exhaust, cold air.

Re: Blowing smoke when cold? [Re: Superflan] #4606975
12/18/17 09:04 AM
12/18/17 09:04 AM
Joined: Apr 2015
Posts: 385
Reunion Island
Superflan Offline OP
Superflan  Offline OP
Joined: Apr 2015
Posts: 385
Reunion Island
Concerned by the fact that it happens when doing the uphill cold and engine load, might it be oil?


Peugeot Partner 1.9 D, 5W40 C3, 245000 Km, running on WVO
Wife's Mitsubishi Outlander PHEV, dealerís overfilled, 16000 Km
Re: Blowing smoke when cold? [Re: Superflan] #4606986
12/18/17 09:17 AM
12/18/17 09:17 AM
Joined: Jan 2011
Posts: 2,718
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,718
N.Ohio
Unless you are losing coolant or oil and there isn't a sweet smell to the exhaust, I wouldn't worry about it. Life is good.

Last edited by Lubener; 12/18/17 09:18 AM.

The "thinking" man's friend.
Re: Blowing smoke when cold? [Re: Superflan] #4607023
12/18/17 10:22 AM
12/18/17 10:22 AM
Joined: Feb 2011
Posts: 6,718
Hudson, NH
LeakySeals Offline
LeakySeals  Offline
Joined: Feb 2011
Posts: 6,718
Hudson, NH
Originally Posted By: Superflan
Concerned by the fact that it happens when doing the uphill cold and engine load, might it be oil?

Uphill incline will cause condensation to run down the pipe, hit a hot area of the exhaust, steam up. My truck does that alot. Doesn't burn a drop of oil. You would know if oil was a possibility, check the oil 2-3k after an oil change. Is it down significantly? Then maybe its what you see. If its blueish.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Blowing smoke when cold? [Re: Superflan] #4607029
12/18/17 10:29 AM
12/18/17 10:29 AM
Joined: Aug 2003
Posts: 12,895
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 12,895
NE,Ohio
Probably water vapor or unburnt fuel (rich open loop cold engine)

When you burn fuel it creates water.

If it doesnt do it fully warm it is likely nothing to worry about.


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