Dpf Question

[bondy]

Hello all you brain box people,

Diesel Particulate Filters, what are they all about. There's lots info on line on what they do, how they regenerate, snake oil to add to fuel, so why do they still get blocked and cost a fortune to fix, clean or replace.

In my mind it all smells of billy bull shit to keep Mrs Greta Attenburgler happy and for car manufacturers & after market people to make some extra dosh.

What are you thoughts on the DPF's.

 

Bondy. 

[Snowbird]

Short journeys will block a dpf very quickly, a good long thrash with it up to temperarure will clean them out fine, the light for ours flashed up last year during the lockdown when swmbo had been doing short rvs jobs and no long runs allowed, a change of supermarket to one 15 miles away sorted it after one run.

[dapleb]

Give it some Bobby bum beans badger.

[bondy]

That's my point peeps. You've got to do the miles or hard driving get it to clean using more juice in the process therefore negating the point of it. Why not just have an efficient diesel engine in the first place until new tech comes along (no i'm not a believer in batteries tech, the environmental cost is to preventative).

Just to point out its not me who has problem with the dpf its our daughter. She has a Ford Galaxy Sludge Box which they need to carry the grand kids and all the associated gubbins. I just started to investigate after trying to do an Italian tune up but I think its past that.

[bjorge]

Well, if doing short trips diesel just ain't it, right? They were the thing for a while letting out less CO2 but here they're banned certain days in towns during winter because of high traditional pollution.

[Catteeclan]

If it's only doing short runs then get a petrol.

[madmopedracer]

dpf reducing pollution  is a myth designed only to move pollution from towns and cities where it absorbs the black soot and then burns it off when traveling at speed i.e. outside towns .

the dpf and egr reduce the efficiency of the engine  needing more fuel  producing more pollution then there is the environmental production cost of the dpfs and adblue etc.

 

Just another environmental/government con

[Studley Ramrod]

What if, right, the car manufacturers gave you some free tree seeds when you bought a car, thus offsetting their carbon footprint and saving the planet.  Then they could pollute as much as they wanted to so long as they gave you enough seeds. eh !  Apparently, Lewis Hamilton is carbon neutral, must be the high protien diet.

 

Car manufacturers just can't be trusted when it comes to stated pollution levels and, of course, mpg.

[fixitsan]

I once built a dongle which plugged into the OBD socket of the Alfa /Vauxhaull/ Saab Z19dth engine to allow the DPF to be 'modified' and the EGR valve to be blocked off.

 

DPF's are almost all 'wall flow' filters, (if you google it you'll get the idea), it's basically a stack of hollow tubes running lengthways and each alternate one is blocked off at the end or at the front. From the inlet side the gasses go down the open ends of the tubes, which themselves are blocked off at the rear leaving only the wall of the tube as a suitable passage.

From the outlet end you see the open tubes which have been blocked off at the front.

Some people drill a hole through them or gut them out completely, but that can cause problems with the regeneration control system which relies on pressure sensors to trigger a regen.

 

What I had success with, was removing the caps of the tubes at the exit side of the filter cartridge, just with a long masonry drill, but only going to a depth of 3-5mm maximum.  drilled off about 20% of the filter face area first, and then did a little bit more too afterwards.

It regenerated fine, with only minimal smoke after that, and meant I didn't need a new filter..

Then i got carried away and removed the whole of the rear face so that it was pretty much a free flowing exhaust and that made the ECU throw up errors as the pressure differential front to back was too small, which is why I had to make the dongle to reset the dpf regen timer every time the car was started so it never attempted a regen in the first place

[Catteeclan]

We've taken a few off now and flushed them backwards and forwards with water and compressed air with good results.

Bloody messy though.

[dandywarhol]

A masonry drill does the trick, if you can remove the DPF and make the job invisible to the MOT tester. You then need to trick the ECU that the DPF doesn't exist otherwise it'll through a code. Most tuning shops can do this and delete the EGR valve too. Greta will luv it! Only downside is more turbo whine through the empty DPF canister.

 

 

 

 

[drewpy]

I had a zaffy 1.9 and deleted the EGR as I was sick of cleaning it. thick sludge and ruined many a top



made a blanking plate and bought a doodaa thingy to fool the car it still had one 

[TKH]

I thought removal of the filter gubbins is an automatic MOT failure? Catteeclan has the right idea, go petrol although not so easy if money is tight.

 

I thought the filtering bits were to help reduce all the particulates that older diesels spew out. When the filter gets hot enough the particulates are burnt off, sometimes with the addition of extra fuel.

This post was last modified: 24-05-2021, 04:04 PM by TKH.

[bondy]

Well, gave the car some top of the range diesel with added snake oil, took it for a dam good trashing (Italian tune up) seemed to help. Had the dpf  cleaned so all is working a lot better. Routine maintenance is now a good run up motorway now and again, good fuel every other top up plus snake oil, we'll see how it goes.

 

As an aside I have a 08 plate Toyota Hilux for work which I generally just bimble about in. When the MOT is due I add snake oil and give it a thrash, never seen so much black smoke, doesn't seem to impress the MAMIL's, but it always passes the emissions test.

 

Boop.

[alanfavell]

Well, gave the car some top of the range diesel with added snake oil, took it for a dam good trashing (Italian tune up) seemed to help. Had the dpf  cleaned so all is working a lot better. Routine maintenance is now a good run up motorway now and again, good fuel every other top up plus snake oil, we'll see how it goes.

 

As an aside I have a 08 plate Toyota Hilux for work which I generally just bimble about in. When the MOT is due I add snake oil and give it a thrash, never seen so much black smoke, doesn't seem to impress the MAMIL'
s, but it always passes the emissions test.

 

Boop.

[dapleb]

Noice Juan badger. ʕ´ᴥ`ʔ

[TKH]

Well, gave the car some top of the range diesel with added snake oil, took it for a dam good trashing (Italian tune up) seemed to help. Had the dpf  cleaned so all is working a lot better. Routine maintenance is now a good run up motorway now and again, good fuel every other top up plus snake oil, we'll see how it goes.

 

As an aside I have a 08 plate Toyota Hilux for work which I generally just bimble about in. When the MOT is due I add snake oil and give it a thrash, never seen so much black smoke, doesn't seem to impress the MAMIL's, but it always passes the emissions test.

 

Boop.

What snake oil do you use? 

I can find snake oil that reduces fine lines and wrinkles but I don't think that'll impress the MOT guy.....

[bondy]

Look up monkey spunk or udder cream that'll sort winkles ;-)

 

A clean safe FAST over take of a peleton riding side by side that's all I'm saying.....

[fixitsan]

I thought removal of the filter gubbins is an automatic MOT failure? Catteeclan has the right idea, go petrol although not so easy if money is tight.

 

 

Yes it is, they look for signs of hidden welding where the innards have been gutted, but as far as I know they don't equate a little bit of scraping to the rear of the core to be the equivalent to dpf removal. In theory you could scrape away at the front of the core to achieve the same effect and the only way to detect that would be to remove it for inspection, which of course is not in the remit of the MOT test

For legal reasons I am not in any way recommending it