DPF regeneration reset?

[Jules13]

Evening all.

The DPF fill level after regeneration won't go down below 35% ( never has on this Autel app) and in the last 2 weeks has steadily got worse and today it only went down to 60%. I had the remap taken off weeks ago, but no difference. Back pressure sensor was also changed a year ago, no difference.
Decided a forced regeneration through the Autel was needed. Autel Maxi AP200 app said fill level was 70% whilst on normal diagnostics page. Started the forced regeneration and it started at 170, so not sure where the extra 100 came from. Over 30 minutes of driving around 35mph, revs at about 2500-3250, it dropped down to 60, so 110 less. Great I thought. Restarted the Autel diagnostics and it said fill level was still 60%???
Does anyone know if you have to reset the DPF so it knows it's empty? Autel has function to program a new DPF, but not sure if this is what's needed.
That figure after the forced regeneration of 60% then kept dropping and dropping to around 50% despite driving about 10 miles which would normally see it go up.

 

[ajlsl600]

I watch mine on icarsoft, after regen (about every 360 miles, if all conditions met) it shows about 8%.
Suggest you find someone with a fresh regen and see what Yr diagnostics say about that

 

[ajlsl600]

I watch mine on icarsoft, after regen (about every 360 miles, if all conditions met) it shows about 8%.
Suggest you find someone with a fresh regen and see what Yr diagnostics say about that

It may be that your kit does not get to read less than 60%?
Of note, I have yet to require a forced regen. And I don't think my icarsoft mb v2 can do it anyway.

 

[Jules13]

It's an intermittent DPF issue anyway. After that forced regen, the fill level only went up by 6% in 30 miles. This morning, it went up 40% in 20 miles???? Trying to think what intermittent issue could cause DPF to fill quickly that doesn't trigger a sensor.

 

[ajlsl600]

Over fuelling? Dodgy injector, boost pipe leaking under heavy load but not much or at all when pottering about? Seeing any smoke at all?

 

[Jules13]

Over fuelling? Dodgy injector, boost pipe leaking under heavy load but not much or at all when pottering about? Seeing any smoke at all?

No smoke at all and leak off test done on injectors and all good. Boost pipe is next guess and it's in the garage on Friday for its MOT.

 

[Dennis80]

I watch mine on icarsoft, after regen (about every 360 miles, if all conditions met) it shows about 8%.
Suggest you find someone with a fresh regen and see what Yr diagnostics say about that

can you get your icarsoft to force a regen, i have the mb 3.0, but i can't get it to start the regen no matter what i try it loads the test but it never starts

 

[LostKiwi]

No smoke at all and leak off test done on injectors and all good. Boost pipe is next guess and it's in the garage on Friday for its MOT.

You won't see smoke as the DPF will catch it.
Sounds like you have a boost leak somewhere. Get a leak test done on the intake side and have the EGR checked/cleaned as a leaking EGR can cause smoke.

 

[M80]

Actually LK that's not accurate.
I've seen smoke passing DPF's.

 

[ajlsl600]

Maybe it had been cut out?

 

[M80]

Maybe it had been cut out?

Nope.
I've seen it on a couple of vehicles, both with DPF intact.

One was smoking like a trooper, LK saw that one. I finally gave up on trying to resolve on realising the engine (a 642) was goosed.

The 651 has done this on an original DPF, and on an after market. Otherwise all performs as expected.

 

[ajlsl600]

The 651 is a good motor. Its all the emissions crxp that spoilsls it, that an the new mb buss plan of hooking u once warranty out with shxt loads designed to be b hard for owners to fix themselves

 

[M80]

The 651 is a good motor. Its all the emissions crxp that spoilsls it, that an the new mb buss plan of hooking u once warranty out with shxt loads designed to be b hard for owners to fix themselves

Tbh I prefer the 646.
But the design to be awkward is so right.
The 642 has a trap or 2 in there as well, and that was designed prior to the more modern era of ' let's screw 'em for what we can'.

 

[Dean Fletcher]

I had this same issue on my om651, the car kept thinking the DPF was full and kept passive regening. sent it off to a few garages inc a mere specialist he kept putting down to the pressure sensor, but the live values were fine when idling and driving, after a bit of research I fired a load of dpf cleaner down both barrels of the sensor upstream and downstream of the filter. left it for 15 minutes while I put it back together then took her for a spin and watched it reduce on the autel to 3%. But what I did notice is the level went up a lot slower than previously.
few weeks ago before I got rid of the car I noticed it was at 98% so kept driving and soon as it hit 100.2% the heat sensors went up to 550 - 600 degrees and the soot level went back down to under 15% within 10 minutes.
I read somewhere that the fill level is estimated by the pressure sensor, if any of the pipes are blocked or partially blocked the level will read fuller than actually is.