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#4804131 - 07/03/18 03:43 PM Why do new cars smoke?
aquariuscsm Offline


Registered: 12/30/06
Posts: 18309
Loc: Dallas,Tx USA
I keep seeing new-newish cars bellowing black smoke out of the exhaust when the accelerate even just moderately. I saw a new Lincoln suv (it said 2.0 ecoboost on the back,maybe an MKX?) accelerate on the hwy to change lanes and black smoke poured out of the exhaust. I see this all the time on new cars only. Why is this?

Please excuse the title typo. Stupid phone touch screen.
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1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
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2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
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#4804133 - 07/03/18 03:44 PM Re: Why do new cars smoke? [Re: aquariuscsm]
Danno Offline


Registered: 10/07/12
Posts: 2023
Loc: Northern Ontario, Canada
DI engines cleaning some soot out.
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#4804137 - 07/03/18 03:46 PM Re: Why do new cars smoke? [Re: aquariuscsm]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18309
Loc: Dallas,Tx USA
Title came out right haha I guess I edited it in time.
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 5W30


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#4804141 - 07/03/18 03:47 PM Re: Why do new cars smoke? [Re: aquariuscsm]
slacktide_bitog Online   content


Registered: 03/20/08
Posts: 6390
Loc: USA
GDI and TGDI engines soot just like diesels.

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#4804145 - 07/03/18 03:50 PM Re: Why do new cars smoke? [Re: aquariuscsm]
Kamele0N Offline


Registered: 02/09/15
Posts: 2106
Loc: Slovenia EU
I dont see that over the pond...Maybe its just because you are using your CAFE oily water in them (sae20) smile
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#4804177 - 07/03/18 04:15 PM Re: Why do new cars smoke? [Re: Kamele0N]
Silverado12 Offline


Registered: 02/26/13
Posts: 3151
Loc: Central Virginia
Originally Posted By: Kamele0N
I dont see that over the pond...Maybe its just because you are using your CAFE oily water in them (sae20) smile


Yeah, the more I think about it the more I think you're right.
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#4804180 - 07/03/18 04:17 PM Re: Why do new cars smoke? [Re: aquariuscsm]
demarpaint Offline


Registered: 07/03/05
Posts: 30030
Loc: NY
It must be a DI thing in gas engines. hide That's what I've noticed. Diesel is a totally different animal, and not really a fair comparison.
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#4804181 - 07/03/18 04:18 PM Re: Why do new cars smoke? [Re: Kamele0N]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35976
Loc: Great Lakes
Originally Posted By: Kamele0N
I dont see that over the pond...Maybe its just because you are using your CAFE oily water in them (sae20) smile

Our fuel mapping over here is different - we run richer fuel mixture to comply with the local emissions regulations. Not sure if that has something to do with it.
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#4804185 - 07/03/18 04:28 PM Re: Why do new cars smoke? [Re: Silverado12]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18309
Loc: Dallas,Tx USA
Originally Posted By: Silverado12
Originally Posted By: Kamele0N
I dont see that over the pond...Maybe its just because you are using your CAFE oily water in them (sae20) smile


Yeah, the more I think about it the more I think you're right.


Funny thing,I wondered this very same thing. Can thin oils get past the rings easier when you put your foot in it vs thicker oils?
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 5W30


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#4804189 - 07/03/18 04:34 PM Re: Why do new cars smoke? [Re: aquariuscsm]
rooflessVW Online   content


Registered: 12/24/11
Posts: 4354
Loc: North Carolina
DI cars do it. Most have sooty tailpipes. Oil weight is irrelevant.
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#4804197 - 07/03/18 04:42 PM Re: Why do new cars smoke? [Re: aquariuscsm]
CT8 Offline


Registered: 10/09/14
Posts: 11245
Loc: Idaho
Originally Posted By: aquariuscsm
Originally Posted By: Silverado12
Originally Posted By: Kamele0N
I dont see that over the pond...Maybe its just because you are using your CAFE oily water in them (sae20) smile


Yeah, the more I think about it the more I think you're right.


Funny thing,I wondered this very same thing. Can thin oils get past the rings easier when you put your foot in it vs thicker oils?
Oil smoke is blueish in color.
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#4804207 - 07/03/18 04:55 PM Re: Why do new cars smoke? [Re: aquariuscsm]
mx5miata Online   content


Registered: 03/28/10
Posts: 569
Loc: NY
Definitely not oil weight related. Just a direct injection thing I've seen it as well.
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#4804216 - 07/03/18 05:14 PM Re: Why do new cars smoke? [Re: aquariuscsm]
tcp71 Offline


Registered: 08/12/13
Posts: 291
Loc: Alberta
My 2016 eco 3.5 DI dual turbo does no such thing. I also run 0w40, but haven't seen this phenomenon around here. Perhaps it's clearing out the condensation/PCV oil mist that has accumulated in the intercooler.

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#4804227 - 07/03/18 05:26 PM Re: Why do new cars smoke? [Re: aquariuscsm]
123Saab Offline


Registered: 10/27/10
Posts: 1705
Loc: PA
My GTI will let out a DSG downshift burp accompanied by a small black puff of smoke when I floor it.

No manners at all.
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#4804231 - 07/03/18 05:33 PM Re: Why do new cars smoke? [Re: aquariuscsm]
cpayne5 Offline


Registered: 12/28/05
Posts: 619
Loc: Virginia
At or near wide open throttle, many cars enter open loop. Those puffs of smoke are usually due to a rich AFR while in that state.

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