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Old 02-12-2019   #76
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Re: Sedici random blue smoke

So I'm thinking of changing the pre cat as you say the only thing we can find out about this issue points to that.
However, with the regularity of the re gens it seems that the dpf may need changing too.
So change them both?
Or could do pre cat first and see how it goes I suppose.
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Old 02-12-2019   #77
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Re: Sedici random blue smoke

Another thing.
What's your oil like? I've found in the past that the 1.9 jtd engine where never very sooty and the engine oil stayed clear between changes. I've looked at a couple of multijet engines too that have had clear oil.
Mine is black a week or so after change and smells of fuel now, I've never stopped it mid re gen since changing the oil btw.
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Old 04-12-2019   #78
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Re: Sedici random blue smoke

I've invested in an infrared thermometer. I've taken readings at full operating temperature-pre cat, near inlet 100c, near outlet 88, pipe from pre cat 80, middle box(cat+dpf), cat area 80, dpf area 67. Given that the temperature is less coming out of the pre cat I would say it's definitely not working correctly.
If the internal temperature can get up to 600c on regen. Do you know what temp it should be at normal running?
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Old 12-12-2019   #79
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Re: Sedici random blue smoke

Oil on mine went black within days, mine is now regenning at the 230-250 mile mark, still lots of smoke in puffs, but looks like no precat for xmas so i will watch yours with interest, my precat only getting to 174.9 deg c , avg last 5 regens dpf temp 578.76 c so precat suspect, but i would only swap out the precat, and see what happens.
do you have multiecuscan software to check internal temps?
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Old 12-12-2019   #80
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Re: Sedici random blue smoke

my precat at normal temp 84.66c
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Old 15-12-2019   #81
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Re: Sedici random blue smoke

Hi, I will need to get modified elm327 plus adapter leads, will the free version of multiecuscan be enough to do a forced regen do you know?
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Old 16-12-2019   #82
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Re: Sedici random blue smoke

Not sure, I did it the other way got the free version, got an unmodified elm3, nothing worked, so paid for ecu multiscan ,still not working so got modified elm3.
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Old 18-12-2019   #83
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I've installed new pre cat, found one of the BM catalyst ones on offer on eBay for 100 plus extra 20% off eBay Christmas offer!
I've ordered elm and leads, for now I'll just see how it goes, due a regen Friday/Saturday. I'm keeping the live mpg on while driving because I won't know if a regen is taking place if there is no smoke! I've measured external temp of pre cat now and it's 128. The pic is of my old pre cat
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Old 18-12-2019   #84
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Re: Sedici random blue smoke

Did you swap it out yourself or was it a garage job?
Ebay are doing genuine fiat precats for 98.00 plus 11 postage, so let me know if that sorts it, thanks.
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Old 18-12-2019   #85
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Re: Sedici random blue smoke

Hi can you put some external photos on the forum so I can check I am looking at the correct part should be fiat part no 71746626
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Old 18-12-2019   #86
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Re: Sedici random blue smoke

233356812305. EBay item number.
This is the part I bought and it fits my vehicle, I don't think I've mentioned, mine is a doblo 120 1.9 multijet 8v. So your pre cat could be slightly different.
I swapped it myself btw.
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Last edited by jon67; 18-12-2019 at 21:29.
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Old 20-12-2019   #87
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Re: Sedici random blue smoke

Different part number but similar other than the bracket.
What was involved in stripping it out and what access did you have to remove it?
Did it take long? thanks



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Old 20-12-2019   #88
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Re: Sedici random blue smoke

Yes it looks the same, the bracket is on my vehicle and the cat didn't come with one so i used the existing one.
First thing to do once the cars on ramps or stands is see if you can get access from underneath to the the clamp holding the cat inlet to the turbo so you can loosen the nut. If not it's a bit of a pain and you have to remove the heat shield from around the manifold.
The 3 bolts on the other section of mine were stuck, so hammer and chisel job.
Without any stuck bolts and if access is easy to the top clamp it shouldn't take more than one hour
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Old 20-12-2019   #89
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Re: Sedici random blue smoke

Also, had regen today,,,, no smoke! Much appreciate you starting this thread otherwise there is nothing anywhere to indicate that this is causing the smoke.
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Old 20-12-2019   #90
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Re: Sedici random blue smoke

GOOD news, what happened with the regen, did it smoke at all? I would expect the distance to increase to 4-600 miles, but brilliant, I will order my own and give it a go, cheers and a merry christmas.
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