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!

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.

A question does your sedici temp guage register to 1/2 way on the guage when fully hot?

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?

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

check the sensor wire for shorts, sounds like its earthing intermittantly, what is the ebay number for the precats as i may buy one at that price.?

I've been looking at the Astra cdti (same engine) and Corsa pre cat decat pipes do you think that we could do that as we still have a cat and a DPF in the section underneath the car. Gain a couple of hp even??

For Doblo but I can't see any reason why it won't fit, same engine.

I was looking at the decat pipes as they were a cheaper option until I found £35 one. May get a few extra mpg too!
There's a thread on here all about them.

If you are based in the UK it is an mot fail if you remove the dpf / cat although it can be done but needs a remap. My engine is a 1.9 multijet not a jtd, although my 2006 stilo has a jtd engine and no dpf although it does have an erg

Put a small camera into the thermometer port on dpf and matrix style filter is present so dpf is intact and clean inside, so i will have to look to the precat for the smoke fault.

Ah interesting.
I had a very smokey regen on Monday. Need to sort this out...
It's strange the only thing that comes up online about this is the pre cat not reaching high enough temp.
I've noticed on mine that the centre box underneath that contains the cat and dpf is heavily dented around the cat area, so that cat may be damaged. If it wasn't for this I would just change the pre cat.

Question, what mpg.? Are you getting?
My currant 1.9 multijet 120 barely achieves 38mpg but my old 1.9 jtd 105 was achieving 49 mpg

I havent really noticed, dash reads around 55 mpg, but economy similar or better than my stilo jtd. My dpf had black soot marks at rear indicating some small leaks so if you do not have soot marks or loud exhaust its probably ok.

techhead0 said:

I havent really noticed, dash reads around 55 mpg, but economy similar or better than my stilo jtd.

Click to expand...

That's interesting, it's yours a 120 also?
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yes multijet 120, had a regen today, they occur at around every 150 miles, drove it to the nearest motorway, lasted 15 mins, light blue smoke in puffs for first 10 mins drove about 10 miles befor it finished, dpf reading "not blocked" 22% so thats ok, mot due so i will see what the exhaust readings are. Still thinking precat, but next regen i will try to monitor temperatures of dpf and precat, if it gets hot enough and still blue smoke its probably gubbed.

Any news? Mine is the same, regen around 150 miles. Here's a photo of dented cat/dpf. It looks like it's had a repair too.

No still waiting to mot, local garage smoke machine is gubbed so will not get my mot for another week, but black spots on your dpf look like air leaks but not enough to replace it. I am using top grade fuel so regen is not too bad, smokey but greatly reduced from original after using dpf cleaner foam.