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Discussion Starter · #1 ·
Once again, my 2.4 Brera has failed its MoT on visible smoke. This happened last year but some diesel cleaner and a regen whilst on a run up the M5 seemed to satisfy the test station, though it was a different tester. Now it has failed on visible smoke again, despite having passed the emissions with flying colours. I searched the forum but all the posts on this issue seemed to go back to May/June last year when the new regs came in. Am I the only one that has this problem? Is there a solution or do I need a new dpf? I can't understand how it passes the emissions test but still has "visible smoke". Any advice would be much appreciated. Mileage is only 77,000 so it should be good for a few years yet.
 

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Alfa 159 2.0 JTDm Lusso 6sp.
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Test only measures emissions...they have no electronic way of measuring visible smoke....yet. But it should not have any that's noticable....my friends 120,000 miler has none when I follow him....and he does not hang about!! So something is wrong with either the fueling (too much being injected that the engine cant burn) or a DPF issue. How long have you owned it? Any chance the previous owners could have partially (or even fully) drilled through or emptied the DPF cylinder in an attempt to gain more power?
 

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Discussion Starter · #3 ·
Test only measures emissions...they have no electronic way of measuring visible smoke....yet. But it should not have any that's noticable....my friends 120,000 miler has none when I follow him....and he does not hang about!! So something is wrong with either the fueling (too much being injected that the engine cant burn) or a DPF issue. How long have you owned it? Any chance the previous owners could have partially (or even fully) drilled through or emptied the DPF cylinder in an attempt to gain more power?
Thanks for the response. My logic is that smoke is made up of particles of carbon and therefore should show up in the emissions. However, clearly that is not the case. The garage that is looking at it for me, which is an MoT test station, said that the emissions were 0.05 against a limit of 0.5.
I have had the car for 10 years. It was previously owned by Fiat so it won't have been modified and I have kept it bog standard. The exhaust is generally very clean except sometimes when starting from cold but then the smoke is light grey and soon disappears. The MoT test station showed me that, if you rev it hard even when hot, there is a faint black smoke coming from the exhaust. I'm worries about a dpf issue. I heard that these are over £2,000. The regen was fairly recent but, would a forced regen help?
 

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Test only measures emissions...they have no electronic way of measuring visible smoke....yet. But it should not have any that's noticable....my friends 120,000 miler has none when I follow him....and he does not hang about!! So something is wrong with either the fueling (too much being injected that the engine cant burn) or a DPF issue. How long have you owned it? Any chance the previous owners could have partially (or even fully) drilled through or emptied the DPF cylinder in an attempt to gain more power?
They do have a machine capable of measuring particulates, which is basically visible smoke.

Our Giulietta failed its MOT last year due to excess particulates, and the tester commented that it did seem a bit smoky.

I took it for an Italian tune up and it just about scraped through.

DPF is present and the car is totally standard.
 

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Alfa 159 2.0 JTDm Lusso 6sp.
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Thanks for the response. My logic is that smoke is made up of particles of carbon and therefore should show up in the emissions. However, clearly that is not the case. The garage that is looking at it for me, which is an MoT test station, said that the emissions were 0.05 against a limit of 0.5.
I have had the car for 10 years. It was previously owned by Fiat so it won't have been modified and I have kept it bog standard. The exhaust is generally very clean except sometimes when starting from cold but then the smoke is light grey and soon disappears. The MoT test station showed me that, if you rev it hard even when hot, there is a faint black smoke coming from the exhaust. I'm worries about a dpf issue. I heard that these are over £2,000. The regen was fairly recent but, would a forced regen help?[The/QUOTE]


Lol..... £2000!...who told you that? Try about a tenth of that and twenty minutes to fit if your are lucky with the bolts....Look at this on eBay http://www.ebay.co.uk/itm/162632249164
 

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Discussion Starter · #6 ·
Well that's a relief. £200 plus fitting I can cope with. Maybe its the genuine Alfa part that costs a lot? However, Jamie Porter (Indy in Royston) tells me that it is most unlikely to be the DPF and I should just give it a blast. i.e. full throttle in 1st, 2nd and 3rd up to the red line 3 or 4 times and it should clear. Hopefully that will do the trick. I will post back with the result in case anyone else is suffering the same problem.
 

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Lol..... £2000!...who told you that? Try about a tenth of that and twenty minutes to fit if your are lucky with the bolts....Look at this on eBay http://www.ebay.co.uk/itm/162632249164
A genuine Alfa DPF is about £2k, I quoted someone on one recently. He only wanted to use genuine Alfa parts. Didn't buy it in the end, its getting chopped in for a Giulia. I'm not entirely convinced the two hundred quid DPFs on ebay are much good, there aren't a lot of other options though.
 

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A genuine Alfa DPF is about £2k, I quoted someone on one recently. He only wanted to use genuine Alfa parts. Didn't buy it in the end, its getting chopped in for a Giulia. I'm not entirely convinced the two hundred quid DPFs on ebay are much good, there aren't a lot of other options though.
If they get the car through the MOT they have to be worth a shot?
 

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Weird, my 2.4 Spider is on 76,000 miles and just flew through the MOT no issues at all today. I never see any visable smoke etc.. Mine does get the whole rev range used on a regular basis so i don;t know if that makes a difference
 

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Our 2.4 with a very porous DPF flew through with emissions well under the regs a few months ago.

I thrashed it for 100 miles commuting to work the day before though, and I mean thrashed it. Redline in every gear joining the motorway, and quite a bit of the journey in 4th at about 80. They seem to like this.
 

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Discussion Starter · #13 ·
Update on my Brera,
It seems that the problem is not to do with the exhaust so much as the intake. My local garage removed the EGR valve and the throttle (actuator?) which were absolutely caked in carbon. He showed me a photo of the boost pressure sensor which was totally caked. I am surprised the engine was running at all, but it probably explains why I lost the turbo for about 20 minutes a couple of months ago. The engineer recommended replacing the inlet manifold as there is only a limited amount of cleaning he can do in situ and he says it has about 5mm of carbon all round the inside of the manifold. He is not an Alfa specialist and reckons this would be a full two days work which would be expensive. The work he did was enough for him to pass the MoT. I have been told to use the full rev range more often. I have now started to drive more aggressively and realise that I had forgotten how much fun the car is! If my wife complains about my driving style, at least I can tell her that I am just following instructions! Let's see what happens next year.
 

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Update on my Brera,
It seems that the problem is not to do with the exhaust so much as the intake. My local garage removed the EGR valve and the throttle (actuator?) which were absolutely caked in carbon. He showed me a photo of the boost pressure sensor which was totally caked. I am surprised the engine was running at all, but it probably explains why I lost the turbo for about 20 minutes a couple of months ago. The engineer recommended replacing the inlet manifold as there is only a limited amount of cleaning he can do in situ and he says it has about 5mm of carbon all round the inside of the manifold. He is not an Alfa specialist and reckons this would be a full two days work which would be expensive. The work he did was enough for him to pass the MoT. I have been told to use the full rev range more often. I have now started to drive more aggressively and realise that I had forgotten how much fun the car is! If my wife complains about my driving style, at least I can tell her that I am just following instructions! Let's see what happens next year.
By the sounds of it, it needs a swirl flap delete, manifold clean out and EGR delete. We do loads of these, it is a big job but no more than a full day for me.
 

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Last weekend I changed the timing belt on my 159 2.4.

At the same time I removed the intake manifold, cleaned it and removed the swirl flaps and plugged them.

Before this there was plooms of black smoke, which I put down to the 2 leaking swirl flaps?

Stupidly I took before photos, but wasn't smart enough to remember to take after photos! I just split the manifold though, soaked it in engine degreaser and pressure washed it.
 

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