DPF problem

[Rotorhead500]

DPF regeneration also needs to see a few parameters met before it initiates; engine up to operating temp for one, and then a sustained run above certain speed/revs (from memory, something like 20+ mins at 40 or 50mph or more). A quick blast between a couple of junctions usually won't do the trick!

 

[M80]

You don't know here if the engine is pumping cr*p into the exhaust, thereby blocking the DPF in a short period.

LK attempted to help me out, always will be appreciated, with a Viano that had issues. After a year and 'experts' doing what ever I finally realised the engine was passing oil and blowing it out the exhaust as unburnt fuel.

We also have to trust the ECU is doing as it should, but all that is a mystery to most and would need deep interrogation to discover if the ECU is still operating at designed parameters. Yours may have been remapped already and over fueling to attempt power gains.

My view is that this is not a level playing field as the eu would say. We will sit behind an older diesel (Land Rover for example) and choke, while our motor will fail MOT when emissions are far cleaner. It's a poor lesson that tells us to buy an older less safe car that is allowed 3 whatevers at MOT. I now have another 2.1 Viano that awaits me to find time to remove the engine as it failed at 0.39, those gits at MB set me up for a fall by printing 0.1 on the VIN.

I don't believe I'm alone as being a person that needs a vehicle and can't afford to replace / renovate to match standards created by a faceless committee of bureaucrats.

Until our Bleeders have the guts to go at the true root cause of pollution I will not have respect.

You can remove and gut the DPF, you would then need the remap to eliminate the DPF elements from the software. But please refer to my earlier post as it isn't w/o risk and may not resolve your issue. The problem may well still exist and cause higher emissions than your mo mo is allowed.

 

[Nickhgard]

A Dpf delete doesn't show up in MOT as the exhaust fumes are still cleaned by the CAT. Dpf only removes particles which doesn't get picked up by MOT test (for now). As more people have suggested it can be a sign of a leak in the turbo system so a vacuum./ smoke test is advised.



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[LostKiwi]

I believe the criteria are:
1. Engine at normal temperature.
2. Fill level at a minimum value to require a regen.
3. Exhaust temperature above a minimum value.
4. At least 1/4 tank of fuel

If any one of those is false no regen.

 

[mioba]

A mechanic said i could get the DPF opened & the contentsremoved, then have re mapping done.

Circumvention wont fix the issue, I recommend you get to a merc specialist who have seen these kind of issues with mercs, a deisel specialist wont help.
A merc specilist with his or her experince coulld say common issues, seen it loads of times its part X.

You mechanic seems not the best tbf.

These DPF threads are like which oil is best thread

 

[Gazwould]

Well there is oil that is better for the dpf than the Mercedes spec , higher anti wear too..

 

[steveq]

The car should go into DPF regen mode without the need for high speed, high revs.
It needs certain conditions to be met including obvious ones such as being up to normal running temp as well as less obvious ones including the fuel tank has to be more than a quarter full.

If you normally drive around with just a few fumes in the tank the car won't do a regen.

 

[malcolm E53 AMG]

I have a rule nowadays that if the car starts a regeneration I run it until the cycle ends which is about 10 miles. Not always possible I know if you have a meeting but any other time

 

[th3h1ghlander]

As many have suggested, even a small boost leak can result in a massive amount of additional soot due to the air volume not being enough for the amount of fuel being supplied which is relative to the throttle position. This along with local driving could definitely result in frequent blockage.
Get an OBDII reader, use it to monitor and check/initiate regens. Make sure you do 1 regen every 800miles. Try this for a few months and see if the situation changes.


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