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Old 4 Weeks Ago   #31
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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?
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Old 4 Weeks Ago   #32
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Re: Sedici random blue smoke

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?
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Old 4 Weeks Ago   #33
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Re: Sedici random blue smoke

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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Old 4 Weeks Ago   #34
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Re: Sedici random blue smoke

Regens have jumped from every 25 miles to 90 miles so moving in the right direction.
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Old 4 Weeks Ago   #35
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Re: Sedici random blue smoke

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.
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Old 4 Weeks Ago   #36
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Re: Sedici random blue 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)
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Old 4 Weeks Ago   #37
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Re: Sedici random blue smoke

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.
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Old 4 Weeks Ago   #38
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Re: Sedici random blue smoke

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.
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Old 3 Weeks Ago   #39
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Re: Sedici random blue smoke

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
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Old 3 Weeks Ago   #40
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Re: Sedici random blue smoke

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.
Attached Files
File Type: zip regen1_Trim.zip (12.15 MB, 6 views)
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Old 3 Weeks Ago   #41
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Re: Sedici random blue smoke

The vid works. Mine's the same on regen, looks pretty bad traveling along the road like this. Do you think a new pre cat will resolve it?
Funny thing, the last five digits of your reg are the same as mine!
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Old 3 Weeks Ago   #42
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Re: Sedici random blue smoke

I am waiting till my mot is due to find out what my car needs, if its not much i may invest in a precat (its the only mention online of why blue smoke continues during regen), but first nice day i will take the dpf off for a look see.
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Old 3 Weeks Ago   #43
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Re: Sedici random blue smoke

A question does your sedici temp guage register to 1/2 way on the guage when fully hot?
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Old 2 Weeks Ago   #44
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Re: Sedici random blue smoke

Yes half way so I would say it's nothing to do with the thermostat or sensor.
Is it an easy job to remove/replace the pre cat? There's a new one on eBay for£35 from a company in the west Midlands. They have 2 in stock. For that price it's worth changing, possibly need new flange and bolts, what do you reckon?
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Last edited by jon67; 2 Weeks Ago at 13:19.
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Old 2 Weeks Ago   #45
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Re: Sedici random blue smoke

That said, today when I went to start the car, after it had been run and reached running temp already then cooled down, I went to start and "maximum temp" warning appeared and temp gauge went to maximum and car wouldn't start, it's done this a couple of times before but there's no regularity. It started fine straight away after. Could be intermittent fault on thermostat sensor, I can't find any info on this anywhere
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