DPF delete

[fossyant]

Thought someone would be around to tell the OP he was the devil. It's an issue with modern diesels, and often the only way to solve the issues is a delete

 

[fossyant]

And I've seen how it went...and declined to do it for all sorts of reasons.

I was doing nothing more than being honest about having been tempted, but common sense and a desire not to have my vehicle seized at the roadside by VOSA prevailed.

Ah but the chances of VOSA stopping you are absolutely zero. I know many people that have had EGR's and ad-blue mapped out. Chatting to a colleague with her T6, had an ad-blue issue that stranded them on holiday, then had it deleted when they came home. No-one cares.

I'm looking at a diesel van next year, and I'll be looking to get as new a one as possible (they stopped doing diesels in the model I want, and it's a useless EV with a range of 100 miles now). It will only be doing long journeys, but I will be looking at ad-blue additives as the van will be stood during the week.

 

[Alex321]

Thought someone would be around to tell the OP he was the devil. It's an issue with modern diesels, and often the only way to solve the issues is a delete

It is never the ONLY way, though it may be the only affordable way.

But I don't believe probvlems are as common as some people suggest. Most people with problems are only using the vehicles for short journeys around town. Which is not what they are best for.

I've owned diesel cars since the late 80's, and have only ever had DPF issues with one of them. Which admittedly, by the time it was sorted, had cost me around £1000 to get fixed. But with every one I have owned, a reasonable proportion of the driving was on motorways or trunk roads, so there was never an issue with regeneration.

 

[Drago]

Ah but the chances of VOSA stopping you are absolutely zero. I know many people that have had EGR's and ad-blue mapped out. Chatting to a colleague with her T6, had an ad-blue issue that stranded them on holiday, then had it deleted when they came home. No-one cares.

I'm looking at a diesel van next year, and I'll be looking to get as new a one as possible (they stopped doing diesels in the model I want, and it's a useless EV with a range of 100 miles now). It will only be doing long journeys, but I will be looking at ad-blue additives as the van will be stood during the week.

Er, I've been directing traffic on enough VOSA (and their predecessor ministry and DVSA) checkpoints to disagree with your odds forecast. There's one that sets up locally about twice a year in a lay by, but you'll not know your local set up because you're neither dibble or VOSA yourself. Gambling with unknown odds is a strange proposition.

And they don't do a simple smoke opacity test like Mr MOT, they use a proper gas analyser. They also have a mirror on a stick to trying to hide welds at the top won't thwart them.

Stuff like adblue delete isn't an MOT item, but VOSA play a different game and when they plug their machine into the OBD port and the SCR system doesn't talk back then it's fame over.

The odds are slim, but that doesn't mean they're non existent. The risk very real and the cost if it goes breasts-skyward will massively outweigh the money saved by opting for some nasty bodgery.

It's like the old adage - just because someone else threw themselves off a cliff doesn't make it a good idea for you to have a go.

 

[derrick]

At the end of the day, adblue is not fit for purpose.

 

[figbat]

At the end of the day, adblue is not fit for purpose.

It depends what purpose you are trying to achieve. AdBlue is used in the SCR to catalytically reduce NOx. NOx needs to be reduced because it is harmful to the cardiopulmonary system. NOx comes about as a consequence of high combustion temperatures.

You can lower NOx levels by running the engine cooler, but then you generate loads of particulates. So there’s a balance between particulates and NOx, operating on opposites end of a see-saw. You can’t manage it in-cylinder so downstream exhaust treatments are required to meet the low limits imposed by legislation. This is part of what happened with VW, who kind of side-stepped the chemistry and engineering to get ‘compliant’ figures.

So, if you want a diesel engine and want it to meet legislation then you need SCR and DPF (and EGR). Unless you can come up with another legitimate way of lowering NOx then AdBlue (SCR) is the only option.

 

[derrick]

It depends what purpose you are trying to achieve. AdBlue is used in the SCR to catalytically reduce NOx. NOx needs to be reduced because it is harmful to the cardiopulmonary system. NOx comes about as a consequence of high combustion temperatures.

You can lower NOx levels by running the engine cooler, but then you generate loads of particulates. So there’s a balance between particulates and NOx, operating on opposites end of a see-saw. You can’t manage it in-cylinder so downstream exhaust treatments are required to meet the low limits imposed by legislation. This is part of what happened with VW, who kind of side-stepped the chemistry and engineering to get ‘compliant’ figures.

So, if you want a diesel engine and want it to meet legislation then you need SCR and DPF (and EGR). Unless you can come up with another legitimate way of lowering NOx then AdBlue (SCR) is the only option.

The problem with adblue is crystals blocking the system, you can buy an additive to stop this supposidly ( the jury is out on that one) Have just started to use that, time will tell, but if that works then why is it not already in the adblue?

 

[screenman]

Thought someone would be around to tell the OP he was the devil. It's an issue with modern diesels, and often the only way to solve the issues is a delete

He is using a dodgy MOT tester, what else is the guy letting through for his mates, he needs reporting, I run a modern diesel, in fact I have run diesels for a very long time, they do the job I want well and have never had DPF problems, but I always buy the right car for the job, seems many do not.

 

[Dadam]

Seems odd to me that every 200/300 miles it spews smoke out regening itself,this is meant to be good for the environment! No way I'm prepared to spend 500/600 quid on a new dpf to have the same happen either.

Only because it's having to do an active regen due to getting clogged up, due to too many short journeys and the DPF not getting hot enough.
Just do an "Italian tune-up" every so often and you're sorted. A lot less hassle and better for your wallet, your vehicle and the environment.

 

[figbat]

Only because it's having to do an active regen due to getting clogged up, due to too many short journeys and the DPF not getting hot enough.
Just do an "Italian tune-up" every so often and you're sorted. A lot less hassle and better for your wallet, your vehicle and the environment.

Maybe. The other reason for a blocked DPF is accumulation of ash from burnt engine oil. The ash that forms when oil is burnt cannot be cleared by a regen (passive or active) or ‘Italian tune-up’. It’s possible it can be chemically cleaned out, but I wouldn’t trust anything that you simply drop in the tank - it would need a DPF removal and intensive cleaning.

 

[screenman]

Maybe. The other reason for a blocked DPF is accumulation of ash from burnt engine oil. The ash that forms when oil is burnt cannot be cleared by a regen (passive or active) or ‘Italian tune-up’. It’s possible it can be chemically cleaned out, but I wouldn’t trust anything that you simply drop in the tank - it would need a DPF removal and intensive cleaning.

The car in question is not being used for the job it was designed to do, even if it gets a full clean it will soon need it again if the owner carries on using the car the same way.

 

[gbb]

No mot failure as mot tester is the garage I use 😁
He's actually the one who advised it.Seems odd to me that every 200/300 miles it spews smoke out regening itself,this is meant to be good for the environment! No way I'm prepared to spend 500/600 quid on a new dpf to have the same happen either.

Never having had a diesel, I often wondered about the clouds of soot coming out if cars, but of course, it doesnt reduce the particulates, simply holds them..then releases them at speed , so out of urban areas, often motorways where the impacton people is lower .

 

[Dadam]

Never having had a diesel, I often wondered about the clouds of soot coming out if cars, but of course, it doesnt reduce the particulates, simply holds them..then releases them at speed , so out of urban areas, often motorways where the impacton people is lower .

Not quite, a "passive regen" is when the system is hot enough through driving at higher revs for a while that it can burn it off the soot. This does reduce particulates. An "active regen" is where the ECU puts more fuel through to try to achieve the same end.

Clouds of soot coming out are usually either from aftermarket tuning or just badly maintained engines. However I think some DPFs might be cheating a bit to dump some unburnt soot.

 

[Chief Broom]

I was looking forward to getting a diesel van as my next vehicle....but not now with all the DPF issues. Will get a Renault petrol which has a trad 1300cc engine

 

[fossyant]

I was looking forward to getting a diesel van as my next vehicle....but not now with all the DPF issues. Will get a Renault petrol which has a trad 1300cc engine

Google wet belts !