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#4606635 - 12/17/17 08:00 PM Blowing smoke when cold?
Superflan Offline


Registered: 04/28/15
Posts: 357
Loc: 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
_________________________
Yaris 1.0 201mkm 5W40 ACEA A3/B4
Kangoo 1.5 DCi 15W40 ACEA E7
Wife's Koleos 2.0 dCi DPF 6AT eco-map 162mkm 5W40 C3

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#4606657 - 12/17/17 08:27 PM Re: Blowing smoke when cold? [Re: Superflan]
BrocLuno Offline


Registered: 09/06/15
Posts: 5526
Loc: 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.

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#4606854 - 12/18/17 01:01 AM Re: Blowing smoke when cold? [Re: Superflan]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7479
Loc: 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.

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#4606866 - 12/18/17 02:26 AM Re: Blowing smoke when cold? [Re: Superflan]
ThankYouma Offline


Registered: 12/14/17
Posts: 59
Loc: 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.

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#4606975 - 12/18/17 08:04 AM Re: Blowing smoke when cold? [Re: Superflan]
Superflan Offline


Registered: 04/28/15
Posts: 357
Loc: Reunion Island
Concerned by the fact that it happens when doing the uphill cold and engine load, might it be oil?
_________________________
Yaris 1.0 201mkm 5W40 ACEA A3/B4
Kangoo 1.5 DCi 15W40 ACEA E7
Wife's Koleos 2.0 dCi DPF 6AT eco-map 162mkm 5W40 C3

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#4606986 - 12/18/17 08:17 AM Re: Blowing smoke when cold? [Re: Superflan]
Lubener Offline


Registered: 01/22/11
Posts: 2577
Loc: 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.


Edited by Lubener (12/18/17 08:18 AM)
_________________________
The "thinking" man's friend.

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#4607023 - 12/18/17 09:22 AM Re: Blowing smoke when cold? [Re: Superflan]
LeakySeals Offline


Registered: 02/18/11
Posts: 6578
Loc: 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 AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 149k ST HM 10w30

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#4607029 - 12/18/17 09:29 AM Re: Blowing smoke when cold? [Re: Superflan]
Rand Offline


Registered: 08/20/03
Posts: 12651
Loc: 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.
_________________________
2017 Jeep Cherokee Trailhawk V6

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