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#1 2024-11-20 09:58:20

MagentaWS
Member
Registered: 2024-09-16
Posts: 18

Smoky exhaust

https://www.parkers.co.uk/car-advice/ca … -cleaners/

Hi folks. I've got a smoky exhaust, it goes away after a few minutes running. The person who helped me with buying the van seems to think there's nothing to worry about, however a friend suggested I use one of the above engine cleaners - and I'm noticing a nervousness about it causing more issues than it resolves.

Thoughts/insights?

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#2 2024-11-20 14:24:42

RegW
Member
From: Bristol
Registered: 2024-04-21
Posts: 223

Re: Smoky exhaust

Give it an Italian tune up, that'll sort it


When all else fails, RTFM  - 2006 Expert 2.0 HDI/110

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#3 2024-11-20 14:54:24

kenbw2
Administrator
From: Preston
Registered: 2017-11-26
Posts: 1,430

Re: Smoky exhaust

What colour's the smoke? I get grey smoke sometimes when the engine's cold, it's just unburned fuel, nothing to worry about

I do get a bit of blueish smoke if I idle for a long time and then set off

Does it fade or get worse if you up the revs when it's cold?


2000 Citroen Dispatch 1.9TD XUD9 Camper Conversion
1999 Citroen Dispatch 1.9D DW8 Disassembled Camper Conversion
1996 Peugeot 806 1.9TD XUD9 Spare vehicle
1998 Citroen Synergie 1.9TD XUD9 Snapped timing belt

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#4 2024-11-27 10:50:37

MagentaWS
Member
Registered: 2024-09-16
Posts: 18

Re: Smoky exhaust

kenbw2 wrote:

What colour's the smoke? I get grey smoke sometimes when the engine's cold, it's just unburned fuel, nothing to worry about

I do get a bit of blueish smoke if I idle for a long time and then set off

Does it fade or get worse if you up the revs when it's cold?

It's grey, and smells (of fuel, presumably - I don't have a good enough sense of smell to be able to name it!). It gets worse when I increase the revs

Thank you

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#5 2024-11-27 14:42:51

RegW
Member
From: Bristol
Registered: 2024-04-21
Posts: 223

Re: Smoky exhaust

Grey is often unburnt or poorly combusted fuel which you may get a bit of on initial startup
on older engines, but should clear quickly
if it persists it could be a leaky injector.
Have you or anyone else put WVO ( waste vegetable oil) in it?
I get why folk want to use it but it has a higher viscosity ( thicker) than deisel
and cause problems on some engines unless it's pre treated or pre heated.

As for additives I sometimes put some Millers Ecomax in my deisel tank which is claimed to increase Cetane rating,
improve combustion and clean the fuel system.
Some people rate it highly but I've never really done any empirical testing to see for myself so all I can say is
it doesn't seem to have done any harm.

What engine do you have?
1.9D, 1.9 TD or 2.0TD? I'm assuming one of the first two

Last edited by RegW (2024-11-27 14:49:29)


When all else fails, RTFM  - 2006 Expert 2.0 HDI/110

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#6 2024-11-27 18:29:04

kenbw2
Administrator
From: Preston
Registered: 2017-11-26
Posts: 1,430

Re: Smoky exhaust

MagentaWS wrote:

It's grey, and smells (of fuel, presumably - I don't have a good enough sense of smell to be able to name it!). It gets worse when I increase the revs

RegW wrote:

Grey is often unburnt or poorly combusted fuel which you may get a bit of on initial startup
on older engines, but should clear quickly

+1, agreed. I wouldn't worry if it clers once the engine warms up a bit


2000 Citroen Dispatch 1.9TD XUD9 Camper Conversion
1999 Citroen Dispatch 1.9D DW8 Disassembled Camper Conversion
1996 Peugeot 806 1.9TD XUD9 Spare vehicle
1998 Citroen Synergie 1.9TD XUD9 Snapped timing belt

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#7 2024-11-27 18:29:20

kenbw2
Administrator
From: Preston
Registered: 2017-11-26
Posts: 1,430

Re: Smoky exhaust

RegW wrote:

Have you or anyone else put WVO ( waste vegetable oil) in it?
I get why folk want to use it but it has a higher viscosity ( thicker) than deisel
and cause problems on some engines unless it's pre treated or pre heated.

Depends on the engine, and the fuel pump. The higher viscosity causes more of this issue because it doesn't mist well when it's cold, but that soon adjusts as the fuel warms up

The XUD9 and DW8 engines are famously perfectly happy on veg oil.

If they're paired with a Lucas rather than the Bosch pump, the pump can't handle the viscosity and will eventually leak/break but the engine itself is fine with it


2000 Citroen Dispatch 1.9TD XUD9 Camper Conversion
1999 Citroen Dispatch 1.9D DW8 Disassembled Camper Conversion
1996 Peugeot 806 1.9TD XUD9 Spare vehicle
1998 Citroen Synergie 1.9TD XUD9 Snapped timing belt

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#8 2024-11-28 20:44:02

startsonether
Member
Registered: 2024-11-11
Posts: 6

Re: Smoky exhaust

wouldnt worry too much, mine has smoked out half the street every morning for the last 5 years

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