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Old 1 Week Ago   #16
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So I spoke to the dpf guy, he says the smoke is normal but you must let the regen complete, it can take up to an hour. Soon as you see it start puffing out get on the motorway, 2,500-3000 revs until it completes. You say you have done this already??
He also said change fuel filter and of course you need to get that contaminated oil out and a new oil filter asap to avoid engine damage.
Dpf and cat could be blocked, you can put a camera down to see.
If blocked get the dpf cleaned and forced regen, 250.
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Old 1 Week Ago   #17
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Re: Sedici random blue smoke

I am now thinking turbo oil seals, if the turbocharger is blowing oil past the seals into the exhaust, which saturates the dpf but does not show until regen, the car tries to clear the dpf , so lots of oily smoke??
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Old 1 Week Ago   #18
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Re: Sedici random blue smoke

I think it would be smoking all time if the turbo seals had gone. Mine has had a new turbo fitted last month so not the case here. But something caused the turbo to go so could be blocked dpf. I'm looking down that route
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Old 1 Week Ago   #19
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Re: Sedici random blue smoke

I did a flush/ oil n filter change today went out and regen started (50 miles since last one) drove up and down the motorway clouds of blue smoke, then on the dual carriageway cars dropping back as car sized clouds of smoke and strong fuel smell, It must have looked like my car was on fire. Got home regen complete, I held a clean sheet of paper in the exhaust stream, microscopic soot paricles (almost nothing) i will check with the multiscan later.
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Old 1 Week Ago   #20
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Re: Sedici random blue smoke

Hmm not a good look...
I've had no sign of blue smoke since Sunday, which was the last time I "interrupted" the regen. However on Friday I put a bottle of Wynns Extreme diesel cleaner in with half a tank of fuel, I don't know if that has anything to do with it,
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Old 1 Week Ago   #21
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Re: Sedici random blue smoke

multiecuscan dpf clogging 33% differential pressure 2-3 normal clogging, if i get the chance i will remove the dpf tommorrow.
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Old 1 Week Ago   #22
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Re: Sedici random blue smoke

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.
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Old 1 Week Ago   #23
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Re: Sedici random blue smoke

Yes smoke with really bad, as you describe. I'll let you know if it happens again
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Old 6 Days Ago   #24
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Re: Sedici random blue smoke

Anyone any idea of the normal readings on mes for the exhaust differential pressure sensor on the rear bulkhead of the sedici ??
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Old 6 Days Ago   #25
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Re: Sedici random blue smoke

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)
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Old 5 Days Ago   #26
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Re: Sedici random blue smoke

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.
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Old 5 Days Ago   #27
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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
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Old 4 Days Ago   #28
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Re: Sedici random blue smoke

No not sorted lots of blue smoke, but dpf reads as clear, so I will try taking it off for a look see,
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Old 4 Days Ago   #29
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Re: Sedici random blue smoke

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.



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Old 4 Days Ago   #30
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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.
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