multiecuscan dpf clogging 33% differential pressure 2-3 normal clogging, if i get the chance i will remove the dpf tommorrow.

re-reading your post was the blue smoke a lot and thick, enough to cause following cars to back off from following close, and did the turbo swap make no difference? I am waiting for directly injected dpf cleaner to arrive but my sedici is a bit embarrassing with regens every 50 ish miles.

Yes smoke with really bad, as you describe. I'll let you know if it happens again

Anyone any idea of the normal readings on mes for the exhaust differential pressure sensor on the rear bulkhead of the sedici ??

OK 1/2 tank of Shells finest diesel, tub of wynns extreme diesel cleaner, can of

mannol 9694 dpf cleaner skooshed into the temp sensor hole, so fingers crossed, all it has done so far is a few puffs of white smoke (no regen yet)

I tried a forced regen today 28 % and unblocked, but still lots of blue smoke billowing around, so i held up some white paper to the exhaust during the regen and in the (Hot) smoke, only minor microscopic soot stains, no oil smoke (which is not what i expected)???
I thought perhaps oil from the turbo, so just in case i will take the dpf off at the weekend and have a look.at what happens with the dpf removed and engine running.see if it blows oily smoke.

Do you think that's sorted it out then? It should have. Otherwise dpf must be blocked. I've not yet had any more smoke clouds since Sunday. I'm not sure if the wynns did the job or not gone into re gen yet. I'll update. Dpf guy recommends to only ever use premium diesel btw

No not sorted lots of blue smoke, but dpf reads as clear, so I will try taking it off for a look see,

found this on another thread

1. If is is DPF regen as suspected, the blue smoke is caused by the post-injected fuel. At first the pre-cat is not hot enough (about 200 degress C) to fully catalyse the unburned post-injected fuel. As the fuel continues to be catalysed, the pre-cat temperature will soon reach approximately 600 deg C, thus the pre-cat is working effectively and no more smoke will be seen.
   
   If blue smoke continues after approximately 1 minute, then either the engine is not hot enough or the pre-cat is faulty.
   
   The way to tell if a regen is in progress is to look at the instantaneous mpg reading on the BC whilst idling. During regen it will read 0.6-0.9 gal/h. In normal operation it will be 0.1-0.2 gal/h.​
   
   
   
   

That's very interesting, what's the pre cat? Can it be replaced or repaired?
I had a regen this morning, started on motorway, lots of blue smoke trailing behind then I had to come off motorway as I was taking the kids to school, blue smoke continued but only on acceleration, lots of it, but not on idle. In total it lasted about 15 minutes.

I'm thinking to replace the catalytic converter and DPF which I presume comes together with the pre cat this is all in one section which can be bought off eBay for about £130. Do you think this will solve the problem of the blue smoke at least and give they fuel economy?

Ok, so pre cat is a separate section, as you probably know. Do you think replacing this will solve the problem and great the fuel to the correct temperature to burn?

I honestly do not know, my sedici did a regen this morning 15 minutes on the motorway, blue smoke but so much less than previous, so i will give it some more wynns and see if it is improving, i do not want to spend any more cash on it as its due an mot soon. Cat on ebay should be around £100 cheapest part no71746626 for my 1.9 multijet, dpf around £150 upwards so not cheap.



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Regens have jumped from every 25 miles to 90 miles so moving in the right direction.

Remember, that i cleaned out the DPF by filling it with foam and taking it for a run, i have done 75miles since last regen so i am due one soon, hopefully less smoke.

140 miles no regen!!! It must be the foam cleaner injected into the dpf that is making a difference (previously regen every 25 miles)

155 mile blue smoke in big puffs but much less than initially and no strong smell of fumes, lasted 10-15 minutes the regen finished. I will try to re- clean the dpf when i get a chance but does anyone else think it may be the precat? next regen i will try to have my laptop and see how hot it gets.

Had a regen again this week on Thursday about 6 days after the previous one, not too much smoke this time thankfully, but still enough to have cars behind pulling way back. I'd also put a bottle of Cataclean in in between which may have helped.
I'll see what happens on the next re gen.

110 miles since last regen , this time in an asda car park, so i let it run, blue smoke but lighter in colour and cooling fan on. 15 mins to complete then 10 miles down motorway, but after exiting as I sat at traffic lights the blue smoke started and cooling fan on for a fresh regen, so another 10 miles motorway and country roads before it stopped??? Looks like allowing it to sit and regen in a car park did not clear the dpf enough, I am now considering a new pre cat and perhaps a thermostat as the water temp only goes to 1/4 guage. Once the mot is out of the way, as i did this on my stilo and it sits at 1/2 guage now

I have attached (hopefully) a zip file of the exhaust smoke during a forced rewgen, however the smoke is the same during a regen whilst driving.