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Old 2 Weeks Ago   #46
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Re: Sedici random blue smoke

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.?
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Old 2 Weeks Ago   #47
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Re: Sedici random blue smoke

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??
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Old 2 Weeks Ago   #48
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Re: Sedici random blue smoke

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Old 2 Weeks Ago   #49
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Re: Sedici random blue smoke

For Doblo but I can't see any reason why it won't fit, same engine.
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Old 2 Weeks Ago   #50
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Re: Sedici random blue smoke

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Old 2 Weeks Ago   #51
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Re: Sedici random blue smoke

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.
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Old 2 Weeks Ago   #52
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Re: Sedici random blue smoke

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
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Old 2 Weeks Ago   #53
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Re: Sedici random blue smoke

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.
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Old 2 Weeks Ago   #54
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Re: Sedici random blue smoke

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.
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Old 2 Weeks Ago   #55
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Re: Sedici random blue smoke

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
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Old 2 Weeks Ago   #56
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Re: Sedici random blue smoke

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.
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Old 2 Weeks Ago   #57
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Quote Originally Posted by techhead0 View Post
I havent really noticed, dash reads around 55 mpg, but economy similar or better than my stilo jtd.

That's interesting, it's yours a 120 also?
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Old 1 Week Ago   #58
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Re: Sedici random blue smoke

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.
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Old 3 Days Ago   #59
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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.
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Old 3 Days Ago   #60
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Re: Sedici random blue smoke

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.
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