Smoke going uphill

johnmowcop

Senior Member
Joined
Nov 17, 2011
Messages
46
Reaction score
6
Location
Stoke on Trent
Your Mercedes
C220 CDI 2005 Also Atego /2002/diesel
Suggestions please.
2007 c200 cdi auto. 59k miles regularly serviced (just had one about 1k miles ago) on a 46 mile to work mostly 2/3rds m/way it averages 56mpg. Car seems to go ok but after a 1 hour trip home tonight the last bit is 1/2 mile up a steep hill from standing start. Not flogging it but noticed in the lights of a following car a lot of smoke. Any ideas please before I take into garage.
Thanks' JohnT
 

LostKiwi

Senior Member
Joined
Aug 25, 2006
Messages
26,584
Reaction score
16,083
Location
Midlands / Charente-Maritime
Your Mercedes
'93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
Perfectly normal at night.
The exhaust contains particulates which are picked up by the lights of the car behind. In daylight you just don't see it as there isn't a strong light directed straight at the exhaust.
 

Taffy7hfa

Senior Member
Joined
May 29, 2016
Messages
1,242
Reaction score
550
Location
Oxford
Your Mercedes
2004 ML350 Inspiration .2002 ML270 CDI .2016 Hyundai i30 1.6crdi.2014 Peugeot 308 1.6 HDI.
Standard for a 10 year old diesel, even a well maintained low mileage example will smoke a bit under load.
If you don't want any smoke trade it in for a petrol car or a much newer diesel.
 
OP
J

johnmowcop

Senior Member
Joined
Nov 17, 2011
Messages
46
Reaction score
6
Location
Stoke on Trent
Your Mercedes
C220 CDI 2005 Also Atego /2002/diesel
  • Thread Starter
  • Thread starter
  • #4
Thanks' for the quick response gents.
 

Paul Goff

Senior Member
Joined
May 17, 2017
Messages
175
Reaction score
38
Your Mercedes
2002 C220CDi CD Estate
Our family steed for about 190,000 miles was a 1.9TD (mechanically controlled) Citroen, after some days driving steadily, giving it serious welly would result in a huge black smoke screen, enough to hide following traffic! In daylight!!!
It would do this for several big boot fulls before settling down, on the way for MOTs it was essential to go the long way round "enthusiastically" or it would fail the smoke test.

The car was replaced by a VAG 1.9 TDI of similar weight but 55% more power, this was 20% more economical and much less smokey.

The present incumbent is an old C220CDi, 25% heavier than either and an auto, it's economy is between the two but less smokey than either, still noticeable though.

Diesels have come a long way in 25 years, BUT the smoke is particulates, and that is the latest bogeyman.

Tis just the way they are.
 

mercedes13156

Senior Member
Joined
Dec 27, 2005
Messages
1,267
Reaction score
210
Location
West Lothian
Your Mercedes
CLK 200 Cabrio and a Ford Kuga
Tootling around lets the particulates accumulate in the exhaust boxes because there's not enough of a breeze in the pipe to push them out the back. Hit a steep hill after tootling for 60 miles and your lower gear pushes up the revs and the gas flow and it collects the particulates, throws them out the back and produces the blackish grey cloud.
 

ajlsl600

Senior Member
Joined
Nov 18, 2013
Messages
5,494
Reaction score
2,708
Location
france
Your Mercedes
clk3202001,sl6002003 with everything regrettably sold ,A class 170cdi auto. NG/TF1800 ML250
i have no idea how most of the ten yr old diesels in france pass a CT. but they DO and many a day i cant see the make.!! they are best thrashed a bit when at opp temps after a week of short runs.
 

mercedes13156

Senior Member
Joined
Dec 27, 2005
Messages
1,267
Reaction score
210
Location
West Lothian
Your Mercedes
CLK 200 Cabrio and a Ford Kuga
All diesels like good thrashing! Even the old diesel cement mixer I used to have ran better after a few heavy batches had been mixed.
 

Taffy7hfa

Senior Member
Joined
May 29, 2016
Messages
1,242
Reaction score
550
Location
Oxford
Your Mercedes
2004 ML350 Inspiration .2002 ML270 CDI .2016 Hyundai i30 1.6crdi.2014 Peugeot 308 1.6 HDI.
Although the dpf and egr are generally the prime suspect, smoke is not always caused by a build up of particulates in the emissions system, over time, worn seals in the turbo, or oil that is past its sell by date can cause engine oil to pool in the bottom of the intercooler, this then gets sucked into the engine when boost pressures are high causing a big plume of smoke when you accelerate, if these problems are left unchecked the engine can eventually "runaway" and eat itself.
 
Gtechniq manufactures an ultra durable and comprehensive range of surface protection products for cars, boats, RV's and aircrafthttp://www.gtechniq.com
Top Bottom