CDTi lots of white smoke...HELP!! - Page 2

Abbadon · 12th August 2014, 22:37

checked with an old colleague - as i remembered a case we had where an injector was failing to leak off correctly - so too much pressure was building in it - so it was hosing extra fuel in just on that cylinder. hard running fixed that particular case but leak off routes through the head in industrial engines before reaching a return line to tank so this may not apply.

Quote:

Originally Posted by trikey

If the PVC was badly blocked, it can take weeks to clear the system of the oil build up, I had one that filled the exhaust with oil!

oil would generally produce blue smoke.

bubs · 13th August 2014, 07:15

Quote:

Originally Posted by Abbadon

white smoke is generally a sign of misfire in a diesel/ incomplete combustion. This is not the same as too much fuel - i.e. black smoke due to particulates from excess diesel.

From my calibration days we used to map the misfire "line" based on the limit of timing where fuel could be injected without misfiring.

just googled to check my memory - see here for a broader discussion of different smoke from a diesel:

http://www.dieselsmoke.com.au/

White smoke is due to raw diesel in completely unburnt form being present in the exhaust gases...

Sooo this will be due to lack of correct timing OR lack of compression/insufficient air temperature due to lack of compression OR faulty/broken injector hosing fuel.

Water could also cause a lack of temperature - basically cooling the combustion down and preventing fuel burning.

Interesting read, you learn something everyday

So the white "smoke" would infact be vapourised diesel, which would fit with the OP explanation of the diesel smell.

Abbadon · 13th August 2014, 07:48

Quote:

Originally Posted by bubs

Interesting read, you learn something everyday

So the white "smoke" would infact be vapourised diesel, which would fit with the OP explanation of the diesel smell.

Indeed fits very well.

Now to determine the cause...

Andy

Bigcul1 · 13th August 2014, 10:26

I had white smoke on my old MGZT that was down to an insufficiently tight fuel filter spraying diesel down onto the exhaust and subsequently emitting white smoke. Might be something to check. It was fairly obvious though, as was the soaked engine cover foam.

On mine it was a failing No:3 injector which allowed a build up of unburnt fuel in the exhaust. The amount of white smoke was unbelievable.

wuzerk · 13th August 2014, 16:07

I had an episode of whitish smoke when I tried an alternative Maf supplied by Rover Ron which he stopped selling thereafter! You say that you cleaned the MAF, what you should do is to unplug its connector and then try it, you will do no harm and will at least eliminate that from the possibles.

wizzo337 · 13th August 2014, 20:39

Hi.
Mine had white smoke from the Exhaust, really only happened at low revs/idle, I found two loose injectors and tightened the securing nuts for the "C" clamps that hold them in. This cured it and since then I have replaced the sealing washers for the injectors, dead cheap off ebay and a simple task, no more white smoke, no more lumpy idle and much better fuel consumption too.
It happened not long after I put some diesel cleaner in the tank so must have cleaned out all the sh1te that was keeping them sealed.
Hope this helps.
Wizzo337.

Trevor1975 · 13th August 2014, 21:48

Quote:

Originally Posted by bubs

Interesting read, you learn something everyday

So the white "smoke" would infact be vapourised diesel, which would fit with the OP explanation of the diesel smell.

When the red arrows trail white smoke, that is just diesel injected out into the exhaust path...

Mike Noc · 13th August 2014, 22:01

So what do they inject for the blue and red smoke?

Saw them at Cowes last week and very impressive they were too. Especially the start - everyone looking out to sea and they came in low over the buildings from behind.

There was also a lone Typhoon demonstration. What a plane, and what a superb pilot to show it off to the max.

Vossy · 13th August 2014, 22:03

Quote:

Originally Posted by Mike Noc

So what do they inject for the blue and red smoke?

Saw them at Cowes last week and very impressive they were too. Especially the start - everyone looking out to sea and they came in low over the buildings from behind.

There was also a lone Typhoon demonstration. What a plane, and what a superb pilot to show it off to the max.

Its still diesel but they add a dye to colour it, always put on a good show.

rich17865 · 13th August 2014, 22:08

Dave, have you done a compression test?

Is it still running like a bag of spanners?

Have you swapped injectors from another diesel?

13th August 2014, 10:26	#14
Bigcul1 Gets stuck in Rover 75 CDTi Con SE Join Date: Jul 2011 Location: Northallerton Posts: 846 Thanks: 123 Thanked 131 Times in 91 Posts	I had white smoke on my old MGZT that was down to an insufficiently tight fuel filter spraying diesel down onto the exhaust and subsequently emitting white smoke. Might be something to check. It was fairly obvious though, as was the soaked engine cover foam. On mine it was a failing No:3 injector which allowed a build up of unburnt fuel in the exhaust. The amount of white smoke was unbelievable. Last edited by Dragrad; 15th August 2014 at 00:44.. Reason: Consecutive posts - Use the edit ;-)

13th August 2014, 16:07	#15
wuzerk Passed Away Rover 75 CDT 03 auto Conn. SE Join Date: May 2009 Location: London Posts: 2,885 Thanks: 104 Thanked 254 Times in 204 Posts	Smoke I had an episode of whitish smoke when I tried an alternative Maf supplied by Rover Ron which he stopped selling thereafter! You say that you cleaned the MAF, what you should do is to unplug its connector and then try it, you will do no harm and will at least eliminate that from the possibles.

13th August 2014, 20:39	#16
wizzo337 Loves to post mg zt Join Date: Mar 2014 Location: Ely Posts: 288 Thanks: 55 Thanked 87 Times in 52 Posts	White Smoke Hi. Mine had white smoke from the Exhaust, really only happened at low revs/idle, I found two loose injectors and tightened the securing nuts for the "C" clamps that hold them in. This cured it and since then I have replaced the sealing washers for the injectors, dead cheap off ebay and a simple task, no more white smoke, no more lumpy idle and much better fuel consumption too. It happened not long after I put some diesel cleaner in the tank so must have cleaned out all the sh1te that was keeping them sealed. Hope this helps. Wizzo337.

13th August 2014, 22:01	#18
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,566 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	So what do they inject for the blue and red smoke? Saw them at Cowes last week and very impressive they were too. Especially the start - everyone looking out to sea and they came in low over the buildings from behind. There was also a lone Typhoon demonstration. What a plane, and what a superb pilot to show it off to the max.

13th August 2014, 22:08	#20
rich17865 This is my second home Transit Connect Join Date: Feb 2011 Location: Crewe Posts: 9,532 Thanks: 868 Thanked 1,619 Times in 1,095 Posts	Dave, have you done a compression test? Is it still running like a bag of spanners? Have you swapped injectors from another diesel?