DPF Cleaning

[Jhonno]

Specifically.. How is the process supposed to work, if done on the vehicle? (A product that "foamed out the exhaust").

Is it; DPF cleaned. Soot/load levels restored to 0 or at least working range?

Or DPF cleaned. Soot loosened ready for it to regen and clean itself with the help of the "clean"?

[LimSlip]

If you mean companies that provide DPF cleaning services then they are removed from the vehicle and a machine flushes them with a cleaning solution and can measure the pressure drop before and after. If you mean your local back street garage then they probably get the pressure washer onto it.

[Jhonno]

LimSlip said:

If you mean companies that provide DPF cleaning services then they are removed from the vehicle and a machine flushes them with a cleaning solution and can measure the pressure drop before and after. If you mean your local back street garage then they probably get the pressure washer onto it.

I mean someone coming out, doing something to it with some chemicals, then leaving..

Soot/ash readings before and after being 180%..

[GreenV8S]

It's hard to imagine how you could clean them effectively on the vehicle other than by doing a regen.

[Zener]

You need to ask why you have excess accumulation in the 1st place with everything functioning correctly glow plugs, EGR, no boost leaks etc , and not used for too many short journeys there should be no need for this kind of service/process , I see cars with over 200k miles never needing or having DPF issues so long as you deal with running faults early or engine light/DTC malfunctions and diagnostic scanned every service for future issues or historic codes

[Jhonno]

Zener said:

You need to ask why you have excess accumulation in the 1st place with everything functioning correctly glow plugs, EGR, no boost leaks etc , and not used for too many short journeys there should be no need for this kind of service/process , I see cars with over 200k miles never needing or having DPF issues so long as you deal with running faults early or engine light/DTC malfunctions and diagnostic scanned every service for future issues or historic codes

DPF issue was due to a dead glow plug and the vapouriser died. Now replaced. Regen achieved.

[Jhonno]

GreenV8S said:

It's hard to imagine how you could clean them effectively on the vehicle other than by doing a regen.

This is the issue..

DPF cleaning service said it can clean on the car.

DPF soot readings before clean 180%, after clean 180%..

Later in the day a forced regen was achieved after realising the wrong fuse was checked for the vapouriser (embarrassing on my part, checking Google, not the handbook mid job).

That is a side story though.

My question is really, when the DPF clean was performed, would you expect the DPF to be cleaner, or does it just "loosen" the soot/ash waiting for it to regen (although you would expect a forced regen to be part of the service surely?).

[GreenV8S]

Jhonno said:

when the DPF clean was performed, would you expect ...

I think the people you paid to do it are the only ones who can answer that. But I can't think of any practical way to clean a DPF without access to it, and if the cleaning was going to achieve anything I'd expect it to happen during the cleaning process and not aftwards. If your 180% figures are based on blockage measurements, that suggests the cleaning actually had no effect. But it's possible they're being calculated by the ECU as part of the regen management in which case it may simply be that the ECU doesn't know the DPF was cleaned.

[Jhonno]

GreenV8S said:

Jhonno said:

when the DPF clean was performed, would you expect ...

I think the people you paid to do it are the only ones who can answer that. But I can't think of any practical way to clean a DPF without access to it, and if the cleaning was going to achieve anything I'd expect it to happen during the cleaning process and not aftwards. If your 180% figures are based on blockage measurements, that suggests the cleaning actually had no effect. But it's possible they're being calculated by the ECU as part of the regen management in which case it may simply be that the ECU doesn't know the DPF was cleaned.

Thing is the chap who came to clean it was very "can't tell you" about the process..

The chap reset the DPF as he presented a 0% reading after. 5 miles down the road the ECU light was back on with a soot accumulation fault, and upon checking the load readings they were as before the clean.

[GreenV8S]

Jhonno said:

Thing is the chap who came to clean it was very "can't tell you" about the process..

The chap reset the DPF as he presented a 0% reading after. 5 miles down the road the ECU light was back on with a soot accumulation fault, and upon checking the load readings they were as before the clean.

I suspect you just bought some snake oil.

[Chris32345]

GreenV8S said:

It's hard to imagine how you could clean them effectively on the vehicle other than by doing a regen.

Remove pressure sensor and pump cleaning fluid I to them


But that o ly help remove some of it needs removing really