V50 Engine 2.0D : - What causes black smoke ?

AndyMcc · Feb 27th, 2012, 20:23

As the title says really. I have a three yr old 2.0D, 36,500 non DPF and tonight I booted it in 2nd and noticed a good plume of smoke from the exhaust in the rear view mirror. Can't say I've noticed it before. Usaually drive fairly easy and don't often push it through the rev range. Non oil burner between service grand car.
What causes this ?

Andy

Daim · Feb 27th, 2012, 20:28

What causes black smoke? Diesel?

You drive a diesel non-dpf meaning the diesel isn't filtered. ALL diesels emit smoke aka soot. This is normally burned in the DPF. No DPF - no burning.

It is totally normal BUT can be a sign that something isn't right. The diesel injectors have to spray ultra fine in order for the diesel to burn properly. If they wear off (which they will with age), you'll notice more and more black smoke - even when not driving heavy footed.

Kind of like an old car which is running rich. It will chuck out loads of black smoke...

Keep an eye on it. If it only happens on hard acceleration, then all is fine. If it does it more frequent at lower speeds in higher gears with little pressure on the

-pedal, then something is wrong.

Ninja59 · Feb 27th, 2012, 22:05

it also cannot keep up with the turbo and therefore will produce some when you give it the beans i tend to find with mine that plenty in 3rd and 4th does it some good also if you drop back to 70 mph on cruise for a distance then give it some then it will then i tend to save it up for tailgaters then go for it soon gets them off its worth giving it the beans to help clear the whole system specially the EGR valve.

v40bart · Feb 28th, 2012, 20:38

One simple answer - EGR recirculating exhaust gas!

Daim · Feb 28th, 2012, 22:27

Quote:

Originally Posted by v40bart

One simple answer - EGR recirculating exhaust gas!

I don't even think the 2.0d without DPF has an EGR.

jimka · Feb 28th, 2012, 22:52

also a sign that the engine cannot breath.. cleaned/replaced air filter recently? my old derv burner use to smoke before I fitted a k&n drop in filter, in stopped as soon as I did this!

v40bart · Feb 29th, 2012, 05:44

Quote:

Originally Posted by Daim

I don't even think the 2.0d without DPF has an EGR.

I have an euro 4 without the DPF and with, yes, EGR...

v40bart · Feb 29th, 2012, 06:00

Quote:

Originally Posted by jimka

also a sign that the engine cannot breath.. cleaned/replaced air filter recently? my old derv burner use to smoke before I fitted a k&n drop in filter, in stopped as soon as I did this!

This is caused by EGR too, it cuts available oxygen from the charge under heavy load ie when accelerating.

Metblackrat · Feb 29th, 2012, 17:54

Quote:

Originally Posted by Daim

I don't even think the 2.0d without DPF has an EGR.

All do. Mine is a Euro 3 and it does.

Black smoke is unburnt fuel. As diesel engines don't run stoichiometrically like petrol engines you will always get smoke unless it is caught in a DPF.

kebab10 · Feb 29th, 2012, 18:46

Quote:

Originally Posted by Metblackrat

All do. Mine is a Euro 3 and it does.

Black smoke is unburnt fuel. As diesel engines don't run stoichiometrically like petrol engines you will always get smoke unless it is caught in a DPF.

What the dickens is that word? Stoic??/?

Feb 27th, 2012, 20:23	#1
AndyMcc Member Last Online: Sep 27th, 2019 17:18 Join Date: Feb 2012 Location: Lancaster	What causes black smoke ? As the title says really. I have a three yr old 2.0D, 36,500 non DPF and tonight I booted it in 2nd and noticed a good plume of smoke from the exhaust in the rear view mirror. Can't say I've noticed it before. Usaually drive fairly easy and don't often push it through the rev range. Non oil burner between service grand car. What causes this ? Andy

Feb 27th, 2012, 20:28	#2
Daim Brit in Germany Last Online: Yesterday 23:23 Join Date: Jan 2011 Location: Bremen	What causes black smoke? Diesel? You drive a diesel non-dpf meaning the diesel isn't filtered. ALL diesels emit smoke aka soot. This is normally burned in the DPF. No DPF - no burning. It is totally normal BUT can be a sign that something isn't right. The diesel injectors have to spray ultra fine in order for the diesel to burn properly. If they wear off (which they will with age), you'll notice more and more black smoke - even when not driving heavy footed. Kind of like an old car which is running rich. It will chuck out loads of black smoke... Keep an eye on it. If it only happens on hard acceleration, then all is fine. If it does it more frequent at lower speeds in higher gears with little pressure on the -pedal, then something is wrong. __________________ The Best Nation Is Imagination 2010 V70 (Type 135) D5 (D5244T10) Automatic (TF-80SC)

Feb 27th, 2012, 22:05	#3
Ninja59 Probably Akita's Toyboy.. Last Online: Dec 27th, 2023 22:24 Join Date: Jul 2010 Location: A House.	it also cannot keep up with the turbo and therefore will produce some when you give it the beans i tend to find with mine that plenty in 3rd and 4th does it some good also if you drop back to 70 mph on cruise for a distance then give it some then it will then i tend to save it up for tailgaters then go for it soon gets them off its worth giving it the beans to help clear the whole system specially the EGR valve. Last edited by Ninja59; Feb 27th, 2012 at 22:16.

Feb 28th, 2012, 20:38	#4
v40bart Master Member Last Online: Jun 14th, 2015 13:09 Join Date: Sep 2006 Location: London	One simple answer - EGR recirculating exhaust gas! __________________ 2008 V50 2.0 D, silver, off-black leather interior, plod spec 320mm brakes and suspension, says 140 ps on the sticker but flies like proverbial off a shovell. NICE...

Feb 28th, 2012, 22:52	#6
jimka Volvo Obsessed Last Online: Apr 22nd, 2024 09:35 Join Date: Aug 2006 Location: Southampton	also a sign that the engine cannot breath.. cleaned/replaced air filter recently? my old derv burner use to smoke before I fitted a k&n drop in filter, in stopped as soon as I did this!

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