Cloud of smoke on start up

sp33der · Jul 13, 2008

Hey, had our Discovery 300tdi a week now and due to unusual circumstances, have driven near 500 miles in it. Hasn't used any oil, running nice as far as I know but I notice that when I start it, especially after a short stop, it puffs out a cloud of black smoke, fairly brief but very noticeable! It's done circa 140k, fully serviced and I wonder if that smokiness is anything to be concerned about? Doesn't smoke when driving and I'm thinking black smoke is diesel rather than oil....I think...yes?

david451 · Jul 14, 2008

sp33der said:
Hey, had our Discovery 300tdi a week now and due to unusual circumstances, have driven near 500 miles in it. Hasn't used any oil, running nice as far as I know but I notice that when I start it, especially after a short stop, it puffs out a cloud of black smoke, fairly brief but very noticeable! It's done circa 140k, fully serviced and I wonder if that smokiness is anything to be concerned about? Doesn't smoke when driving and I'm thinking black smoke is diesel rather than oil....I think...yes?

Black smoke is fuel, and it's not uncommon for diesels to puff out a bit on start up, however it sounds like your injectors might be leaking off into the cylinders and the smoke everytime you leave it for a short time is the fuel laying in the cylinders burning off.

Might be an idea to get them tested.

Cabbie · Jul 14, 2008

Could be mucky injectors. Try some additive such as Millers in the tank, that's your first step, worked fo me loads of times.

sp33der · Jul 14, 2008

cheers, I'll try a spot of additive 1st!

Sean · Jul 14, 2008

also check that all of the glowplugs are working, starting with minimal use of the plugs tends to result in slightly more unburnt fuel being given off

Ciaran666 · Jul 15, 2008

It may be the glow plugs but put a meter between all of them and check if any are dead ( Seen thread on here before how to check if working), mine was ok , checked and re checked and puffed more smoke than Amy Winehouse for 5 years but no probs ever even on cold winter days.

Sean · Jul 15, 2008

Ciaran666 said:
It may be the glow plugs but put a meter between all of them and check if any are dead ( Seen thread on here before how to check if working), mine was ok , checked and re checked and puffed more smoke than Amy Winehouse for 5 years but no probs ever even on cold winter days.

"put a meter between them all " ?

if you need to check the plugs unscrew them one at a time and while holding the tip that came out of the engine apply a high current 12v supply to them

if you say ouch within 5 seconds of applying the voltage they are working

david451 · Jul 15, 2008

Cabbie said:
Could be mucky injectors. Try some additive such as Millers in the tank, that's your first step, worked fo me loads of times.

Yep good idea and wont do it any harm, it will clean the system out, but dont leave it too long, if it is the injectors it washes the bores and can cause a build up of carbon on the pistons resulting in thermal cracking.

thebiglad · Jul 15, 2008

sp33der said:
Hey, had our Discovery 300tdi a week now and due to unusual circumstances, have driven near 500 miles in it. Hasn't used any oil, running nice as far as I know but I notice that when I start it, especially after a short stop, it puffs out a cloud of black smoke, fairly brief but very noticeable! It's done circa 140k, fully serviced and I wonder if that smokiness is anything to be concerned about? Doesn't smoke when driving and I'm thinking black smoke is diesel rather than oil....I think...yes?

If in doubt, put a new airfilter in - they only cost about £3.50+vat so why wouldn't you??

Paddock Spares - Land Rover, Range Rover Parts & Accessories - Discovery, Defender and Freelander

Cheers
Dave

sp33der · Jul 15, 2008

Ordered one yesterday....from Paddocks

Dave 2000 · Jul 16, 2008

My 200 tdi and mi amigo's 300 tdi both give a little black puff when started hot or cold. Both cars in perfect condition and it seems to be the norm with older Discoveries.

It was once mentioned that this is the price of not having complex electronics controlling the fuel..........suits me!

regards

Dave

david451 · Jul 17, 2008

Sean said:
"put a meter between them all " ?

if you need to check the plugs unscrew them one at a time and while holding the tip that came out of the engine apply a high current 12v supply to them

if you say ouch within 5 seconds of applying the voltage they are working

Oooh heir Sean I like it, have you tried linkin them all togever around yer testicals, and at the same time dip yer willie in battery acid. Get the wife ter whip yer with some twin core aswel.

Sean · Jul 17, 2008

david451 said:
Oooh heir Sean I like it, have you tried linkin them all togever around yer testicals, and at the same time dip yer willie in battery acid. Get the wife ter whip yer with some twin core aswel.

ermm no not today

but it has only just gone 11am so who knows

Cloud of smoke on start up

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