Black Smoke on Start Up

Terry Westley · Jan 3rd, 2008, 23:32

Just a quick line. Its just regards to my 2001 V70 T5 with 92k on the clock. On start up first thing in the morning I have noticed that exhaust fumes seem rather dark and the car runs very lumpy for literally the first minute or 2 (although it is rather cold at the moment though). Its the black smoke i am more concerned about. I tend to let her tick over for a couple of minutes before driving off. After a couple of minutes the car i guess gets to a stage where things have warmed up a bit and then i drive off without a hitch and the exhaust fumes are normal. Any ideas????
Fuel consumption is average for this car about 30 or so on a long journey and around 26-27mpg around town. I have her booked in for a routine oil and filter change on next saturday

Kerry_T-5R · Jan 4th, 2008, 10:11

Hi Terry

A small amount of black smoke is normal, it is just un-burned fuel from where the car runs rich on a cold start up. As for the lumpy idle im not sure?

Kerry

stusT5 · Jan 4th, 2008, 10:38

could be the valve stem oil seals milage sounds a bit low for this though

STE-MAL · Jan 5th, 2008, 22:16

Some sort of fuel/air temp sensor, maybe giving wrong readings to the ECU causing over fueling on start up.

Someone will know.

juliobee · Jan 5th, 2008, 22:22

I don't think the black smoke is anything to worry about with a cold engine on start-up. I would be more inclined to worry if it was present all the time. As well as other things suggested the air filter may well be worth a look. If it is dirty replace it.

Good Luck Juliobee.

Jan 3rd, 2008, 23:32	#1
Terry Westley Junior Member Last Online: Nov 3rd, 2008 13:41 Join Date: Apr 2006 Location: Guildford	Black Smoke on Start Up Just a quick line. Its just regards to my 2001 V70 T5 with 92k on the clock. On start up first thing in the morning I have noticed that exhaust fumes seem rather dark and the car runs very lumpy for literally the first minute or 2 (although it is rather cold at the moment though). Its the black smoke i am more concerned about. I tend to let her tick over for a couple of minutes before driving off. After a couple of minutes the car i guess gets to a stage where things have warmed up a bit and then i drive off without a hitch and the exhaust fumes are normal. Any ideas???? Fuel consumption is average for this car about 30 or so on a long journey and around 26-27mpg around town. I have her booked in for a routine oil and filter change on next saturday

Jan 4th, 2008, 10:11	#2
Kerry_T-5R 854 T-5R owner Last Online: Sep 9th, 2023 10:15 Join Date: Nov 2006 Location: Eastbourne View Photos By: Kerry_T-5R	Hi Terry A small amount of black smoke is normal, it is just un-burned fuel from where the car runs rich on a cold start up. As for the lumpy idle im not sure? Kerry __________________ Volvo 850 T-5R manual (Olive) B5234T5 : 305 bhp & a 14.5 sec 1/4 mile @ 101 mph & Volvo S40 1.9D S 2004 Daily driver Ex-Volvo: B4194-T2 (S40 T4). Last edited by Kerry_T-5R; Jan 4th, 2008 at 10:15.

Jan 4th, 2008, 10:38	#3
stusT5 850 t5 and r owner Last Online: Aug 21st, 2014 07:28 Join Date: May 2007 Location: epsom View Photos By: stusT5	could be the valve stem oil seals milage sounds a bit low for this though __________________ www.t5d5.org the no nonsense free speech performance volvo site

Jan 5th, 2008, 22:16	#4
STE-MAL You Can't Beat A Swede Last Online: Aug 3rd, 2019 18:33 Join Date: Dec 2003 Location: Kesgrave View Photos By: STE-MAL	Some sort of fuel/air temp sensor, maybe giving wrong readings to the ECU causing over fueling on start up. Someone will know. __________________ 1993 850 2.0 20v SE Auto, 1996 850 T-5 CD Auto 1998 V70 R Manual, 2001 S80 D5 SE manual 2007 S80 V8 AWD Auto 2017 V40 T-3 Inscription Auto

Jan 5th, 2008, 22:22	#5
juliobee New Member Last Online: Jan 18th, 2008 19:21 Join Date: Dec 2007 Location: London	I don't think the black smoke is anything to worry about with a cold engine on start-up. I would be more inclined to worry if it was present all the time. As well as other things suggested the air filter may well be worth a look. If it is dirty replace it. Good Luck Juliobee.

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