Dpf questions

[monty9120]

Hi all never had a vw with dpf before but picked up an 08 2.0 diesel 170bhp

Just wondered how the regen works I seem to randomly get a charcoal kind of smell and I seem to then get white smoke

Does it do it slowly all the time as when I got to work today it was smoking quite bad. I’ve not had any dpf lights on the dash


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[Crasher]

The BMN engine is a nightmare, first of all you need to know if the DPF is intact internally and that the ECU software is original. After that, usually a new DPF, the first step to reducing the eye watering stench from the exhaust is to replace and carefully set up four new injectors. So, if the DPF has been rodded out and the ECU remapped to suit, rectifying the problems to a legal MOT pass (when you can get one) is more than the car is worth; hence why you picked it up cheap...

[monty9120]

The car does seem to be original and the smell from it makes me think it’s burning off soot. The dpf light hasn’t come on yet so I have no idea if it’s intact
Waiting for my local garage to reopen and get them to scan it see if it’s been switched off


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[Crasher]

They stink with or without the DPF, the concept of the engine does not work, the BMN is a joke within the industry. One lady customer loved her 170 Golf but the stench it made was awful. We fitted new injectors, new DPF and the latest VAG software update at HUGE cost but eventually she gave in and bought a CR TDI Golf 7... but that runs so cold she hates it in winter. Your local a garage will not be able to see if the DPF has been rodded by a scan alone.

[monty9120]

Thanks. I don’t mind getting my hands dirty with bits but I will just have to learn how everything operates

You say the engine with or without dpf is an issue. Do you have a few examples and I’ll try and keep an eye on them Kinda throws out my choice of swapping for a 140bhp possibly


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[Crasher]

There is a 140 version of this set up called the BMM but I have come across only a few although I don’t remember one stinking. I suspect the problem is the injectors used in the BMN in relation to their spray pattern and operating pressures. Personally I don’t think it is worth sinking the money into an EU4+DPF car, put it into something that won’t fall foul of the ULEZ’s although these have been pushed back a year.

[monty9120]

That’s a shame. The car actually drives really well and only 93k i will see how it goes for a few months I will
Always make money back onit


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[monty9120]

Does anyone know if the 08 onwards 140 bhp dpf models any good think then bmm engine code

Reason I ask I didn’t realise then engines changed from pd to common rail. Probably why mines so quick

I’ve got a 07 non dpf to look at but most were really slow for what they Are on test riding in the past thanks


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[Crasher]

I have only seen a few BMM engined models but they don’t appear to be the PITA the BMN is, I am sure the BMN’s problems are down to its injectors.

[monty9120]

Thanks for the reply I’d rather have a non dpf model but hard to get a decent one


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[Crasher]

I would be cautious about buying any Diesel that is not ULEZ compliant, a lot of cities such as Birmingham are introducing Ultra Low Emissions Zones next year, only this C19 stupidity has seen these delayed by a year including Nottingham thankfully as it will cause me a lot of stress getting customers cars into the workshop.

[monty9120]

Hi there I work outside the ULEZ in brum. I know I’ll have to pay to see my parents in London but it’s a lot cheaper to run them my missus petrol so just equals it out

I don’t do finance or loans so it’s what I can afford with a mortgage etc

Anyway purchased the car and it’s a 57 plate 140 bhp. Trouble is I don’t notice a dpf light on when I took it for test drive it drives fine only 89k and is pretty quick

It’s definitely a bmm engine so does that mean dpf removed


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[monty9120]

I meant when turning ignition on


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[Crasher]

The DPF light MUST come on with the ignition and go off when the engine starts, if it does then this is a good start.

[monty9120]

No dpf light comes on at all haven’t had a light in the instrument to see if there is actually a dpf light yet


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[Crasher]

Private message me the reg and I will check

[Crasher]

According to what I can see the rev counter should have a DPF light almost in the middle of the dial at 9 o'clock right next to the needle disc to the right of the steering warning lamp.

[monty9120]

Thanks I will have a look the light doesn’t come on with ignition and I’m sure my 170bhp did


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[monty9120]

The light still doesn’t come on and car feels rapid

Can I access the dpf in vagcom I gather if it’s not there will just say can’t communicate


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[Crasher]

The DPF is just a low grade stainless steel can full of a ceramic honeycomb and has no digital connection, just temp, pressure and oxygen sensors.

[monty9120]

Well it does as it’s in the software that it’s got one.
I’m not too clued up on vagcom so just wondered what options there were


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[Crasher]

What you access is the engine ECU which sends and receives the signals to and from the DPF.

[monty9120]

So there’s no way to communicate to that system with vagcom

On Peugeot’s you can do into the actual dpf system but I know each are different

Would a mapper have to read the map then send if it off to see or is it easy enough to see themselves


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[Crasher]

On the pug I think you mean the SCR (Selective Catalytic Reduction) system which uses a fluid like the Add-blue system on VAG cars but the BMN does not have an SCR system, part of the reason why it does not work very well. The engine ECU controls all aspects of the DPF unit.

[monty9120]

What system does a bmm use then as it doesn’t smell at all like my old bmn


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[Crasher]

I think it is the BMN injectors as the BMM is 8 valve and uses a different design injector. On Sunday I had to venture out into Bullwell (body armour, hard hat and baseball bat required) to pick up a door lock for the front door at home. I was behind an 8P A3 quattro and I could barley breath, it stank my car out in seconds and my pollen filter is a brand new Mann Frecious Plus. When I got home and had done the door lock, I got the reg number off my dash cam and put it into my trade system, engine code BMN...

[monty9120]

Interesting so is the bmn 16 valve then?

Still had no dpf lights lol


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[Crasher]

Yes, like the BKD.

[monty9120]

That’s interesting it seems to go well enough and much quicker then most bkd I’ve ever driven


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