smoke on start up

[wozapinin]

My defender 300tdi diesel smokes on start up, every time it starts, hot or cold, it doesn't smoke when running. I'd call it white smoke. What should i be checking...cheers.

[vnx205]

First check very carefully that it isn't actually black smoke. If it is black, then that is what it is supposed to do.

Other colours are a bit more of a worry.

[Hall]

White smoke is I think usually water. Was with my diesel Delica. Gray smoke is oil or just a bit to much fuel. Black smoke is to much fuel. Any other colour and it`s time to give up the party drugs.
Cheers Hall

[Biron]

Defender 300tdi Diesel – Black Smoke on Start Up!


Lots of information back in 2010 on this very subject – Black Smoke


d-90.com/forum/showthread.php't=26438


Hope that helps…

[philco]

My mechanic says the same, they are supposed to do it, Remember its a british diesel not a japper, they are designed different.

[Blknight.aus]

black smoke is normal...

its to do with the governor.

very very basically

when the engine is stationary there is no resistance to the full fuel spring so the engine gets full fuel for start up, theres no dynamic advance wound in so injection is happening later than normal for the first couple of firings.. as the engine speeds up the governor flyweights take over and bring everything back to idle (or whatever engine RPM is being requested by the throttle input)

[wozapinin]

thanks for replys, just bought it and really don't need head problems. Got a disco 2 thats had the top end rebuilt and that really did not impress SWMBO. Divorce material. Another explanation on a diferent forum...
It's a mechanical controlled injection pump that is at min fuel-delivery during start up. As the starter motor brings the engine only to a speed that is below normal idle the fuel quantitiy is too high during the first revs (or in other words, it's not enough air for the injected fuel). This results in black smoke...
My 4bd1 normally asperated diesel only blows smoke when being pushed real hard so was a wee bit worried...thanx for replys and saving the marriage:D

[wowscounty]

should be a nice puff of black smoke on start up if white smoke comes out for first 100yrds or so the fuel pump has a diagram that gets stuck and it means recon fuel pump about $1200

[harro]

Black smoke is incomplete combustion
And white smoke is no combustion at all.


Have a look at this, some good simple explanations;).
Diesel Smoke tells YOU a Story… (http://www.dieselsmoke.com.au/)

Cheers,
Paul.

[rick130]

Black smoke is incomplete combustion
And white smoke is no combustion at all.


Have a look at this, some good simple explanations;).
Diesel Smoke tells YOU a Story… (http://www.dieselsmoke.com.au/)

Cheers,
Paul.

and black smoke is entirely normal at startup for a Tdi, they all do it, as Dave explains above.

[vnx205]

black smoke is normal...

its to do with the governor.

very very basically

when the engine is stationary there is no resistance to the full fuel spring so the engine gets full fuel for start up, theres no dynamic advance wound in so injection is happening later than normal for the first couple of firings.. as the engine speeds up the governor flyweights take over and bring everything back to idle (or whatever engine RPM is being requested by the throttle input)

You have just shattered an illusion that have held for some time.

I knew that 300TdIs blew a puff of black smoke on startup. I had assumed that it was some fiendishly clever aspect of the design deliberately incorporated to reduce the need to use the glow plugs for cold starts.

Are you telling me that rather than something deliberately engineered into the fuelling system of the 300Tdi, that it is just an unintended, though useful, consequence of using an antiquated mechanical governor?

[460cixy]

I love the dutchy on start up when clowns are hanging around the back of the ute. Had a bunch of toyo stooges hanging around like hemeroids at son of trails so I duched em out of course

[Bush65]

With diesels:

Black smoke indicates incomplete combustion leading to soot particles in the exhaust. Engine not properly warmed up, or if warmed up, then too much fuel for the available air. If it is lack of air, then it could be a turbo, or boost leak problem.

White smoke when a cold engine is starting is not a concern. It indicates fuel that has not burned.

Blueish, grey smoke indicates engine oil is being burnt, i.e. oil bypassing rings, valve stems, or turbo seals.

I rather think from the original post it is not much to be concerned about.