Diesel producing a lot of soot

Ravinder · 15th March 2016, 21:13

Hi guys

My diesel is producing an awful lot of soot from the exhaust when I'm driving. Not so much when just driving along at slow speeds or constant 60-70mph on motorway, but the moment I give it a bit of oomph, there is a lot of soot that comes out the back. Can anyone tell me why this is and how I can prevent this? My friend also has a diesel 75 and his is as clean as a whistle. No soot at all. Many thanks. Ravinder

klarzy · 15th March 2016, 21:24

Could be MAF sensor, egr valve blocked, or ronbox fitted and overfieling. To name but a few... Also check pcv filter

Coups · 15th March 2016, 21:29

Rav, my previous diesel 75 tourer did this when I got it. I changed the PCV and cleaned out the EGR and the car was transformed. Easy and relatively quick to do.

Madderz · 15th March 2016, 21:30

Going a bit old-school here.
Check your airfilter isn't blocked.....

Ravinder · 15th March 2016, 21:53

I have a 160 remap.

I have an EGR bypass.

PCV was changed back in June when I bought the car. Also new filter. It has had a full service.

Would this still effect it?

MAF sensor, you say?

hortonds · 15th March 2016, 22:24

I know it may be stating the obvious. But I had this (exactly) when I bought the car and it got worse. I checked the Intercooler O Rings only to find I had a great big split in the intercooler pipe. I fitted a new pipe (along with O rings and it stopped immediately.

Ravinder · 15th March 2016, 22:30

I have an upgraded SFS silicone hose so don't think it will be that.....

Atcchus · 15th March 2016, 23:06

I think it's probably intercooler hose or the rings. A duff MAF usually over fuel gives your unburnt fuel smell but doesn't give you soot . Check your intercooler hose connections specially the elbow where the O Rings are . Or check the EGR bybass connections . I may be wrong .

maxxpump · 15th March 2016, 23:10

My cars doing the same at the moment and it produces clouds when I let down the accelerator for over takes. Its black smoke and lots of it. I've done all the mods apart from a new inter cooler hose and the MAF is in spec (as far as I know). someone in another thread mentioned it could be down to over fuelling, but I think I've got a dodgy injector so its being under fuelled as the chugging from last year has retuned with the car threatening to stall at idle! Im going to check the filters at the weekend but don't think it is down to that (they were only changed three months ago)

Ravinder · 16th March 2016, 00:09

Many thanks. I can't say I've noticed any smell of fuel and the car pulls well. It's not sluggish or anything like that. I'll check the egr bypass and hose, thanks. Can a blowy back box cause it? My exhaust is blooms a little as the back box has a hole in it. Thanks.

15th March 2016, 21:13	#1
Ravinder This is my second home Rover 75 saloon x2, Rover 75 Tourer x2, Rover 220 Coupe Turbo Join Date: Aug 2010 Location: Kirkcaldy, Fife Posts: 9,036 Thanks: 2,278 Thanked 2,852 Times in 1,718 Posts	Diesel producing a lot of soot Hi guys My diesel is producing an awful lot of soot from the exhaust when I'm driving. Not so much when just driving along at slow speeds or constant 60-70mph on motorway, but the moment I give it a bit of oomph, there is a lot of soot that comes out the back. Can anyone tell me why this is and how I can prevent this? My friend also has a diesel 75 and his is as clean as a whistle. No soot at all. Many thanks. Ravinder

15th March 2016, 21:24	#2
klarzy This is my second home none but not gone Join Date: Mar 2013 Location: March, Cambs Posts: 16,437 Thanks: 894 Thanked 4,247 Times in 3,025 Posts	Could be MAF sensor, egr valve blocked, or ronbox fitted and overfieling. To name but a few... Also check pcv filter __________________ [SIGPIC][/SIGPIC]….All praise Bananaswan….

15th March 2016, 22:24	#6
hortonds Avid contributor Rover 75 CDTI Tourer Automatic Join Date: Mar 2015 Location: Dunstable Posts: 196 Thanks: 4 Thanked 31 Times in 22 Posts	I know it may be stating the obvious. But I had this (exactly) when I bought the car and it got worse. I checked the Intercooler O Rings only to find I had a great big split in the intercooler pipe. I fitted a new pipe (along with O rings and it stopped immediately. __________________ 300,000 miles and back on the road Jobs done: Everything you can possibly imagine ... I have the "Triggers Broom" of cars.

15th March 2016, 23:10	#9
maxxpump Posted a thing or two Rover 75 CDT Join Date: Aug 2014 Location: Brighton Posts: 1,786 Thanks: 215 Thanked 244 Times in 205 Posts	My cars doing the same at the moment and it produces clouds when I let down the accelerator for over takes. Its black smoke and lots of it. I've done all the mods apart from a new inter cooler hose and the MAF is in spec (as far as I know). someone in another thread mentioned it could be down to over fuelling, but I think I've got a dodgy injector so its being under fuelled as the chugging from last year has retuned with the car threatening to stall at idle! Im going to check the filters at the weekend but don't think it is down to that (they were only changed three months ago) __________________ Mods done: 160 upgrade, EGR bypass, Viton "O" rings, Fitted 16" unions, cleaned manifold, uprated air filter, fog lights, better bulbs, upgraded ICE and full speaker set up.

15th March 2016, 21:29	#3
Coups Posted a thing or two Rover 75 Contemporary SE Join Date: Apr 2014 Location: Dundee Posts: 1,941 Thanks: 545 Thanked 520 Times in 402 Posts	Rav, my previous diesel 75 tourer did this when I got it. I changed the PCV and cleaned out the EGR and the car was transformed. Easy and relatively quick to do.

15th March 2016, 21:30	#4
Madderz Gets stuck in MG ZT-T Join Date: Aug 2015 Location: Barnsley Posts: 594 Thanks: 233 Thanked 132 Times in 121 Posts	Going a bit old-school here. Check your airfilter isn't blocked.....

15th March 2016, 21:53	#5
Ravinder This is my second home Rover 75 saloon x2, Rover 75 Tourer x2, Rover 220 Coupe Turbo Join Date: Aug 2010 Location: Kirkcaldy, Fife Posts: 9,036 Thanks: 2,278 Thanked 2,852 Times in 1,718 Posts	I have a 160 remap. I have an EGR bypass. PCV was changed back in June when I bought the car. Also new filter. It has had a full service. Would this still effect it? MAF sensor, you say?

15th March 2016, 22:30	#7
Ravinder This is my second home Rover 75 saloon x2, Rover 75 Tourer x2, Rover 220 Coupe Turbo Join Date: Aug 2010 Location: Kirkcaldy, Fife Posts: 9,036 Thanks: 2,278 Thanked 2,852 Times in 1,718 Posts	I have an upgraded SFS silicone hose so don't think it will be that.....

15th March 2016, 23:06	#8
Atcchus Posted a thing or two Rover 75 CDT Auto Tourer Join Date: Mar 2014 Location: Glasgow Posts: 1,056 Thanks: 274 Thanked 165 Times in 129 Posts	I think it's probably intercooler hose or the rings. A duff MAF usually over fuel gives your unburnt fuel smell but doesn't give you soot . Check your intercooler hose connections specially the elbow where the O Rings are . Or check the EGR bybass connections . I may be wrong .

16th March 2016, 00:09	#10
Ravinder This is my second home Rover 75 saloon x2, Rover 75 Tourer x2, Rover 220 Coupe Turbo Join Date: Aug 2010 Location: Kirkcaldy, Fife Posts: 9,036 Thanks: 2,278 Thanked 2,852 Times in 1,718 Posts	Many thanks. I can't say I've noticed any smell of fuel and the car pulls well. It's not sluggish or anything like that. I'll check the egr bypass and hose, thanks. Can a blowy back box cause it? My exhaust is blooms a little as the back box has a hole in it. Thanks.