DPF WOES

[OneForTheRoad]

Is it using ad blue ?

 

[talljay]

Is it using ad blue ?

Nope

 

[talljay]

No codes. The only code pre regen was related to DPF full, no other codes after I swapped the sensor.

I don’t believe the dpf sensor reading is any different pre regen but I’ll check tomorrow when it does yet another regen !

So it did actually go higher pre regen it did go to .29 on Icarsoft bar reading and slightly higher so 290 millibar on hard throttle so definitely an increase on pressure pre regen - don’t know if that is blocked, regen is running fine like I say but it it literally every 50 miles

 

[talljay]

If it's still only reaches 80mbar that's too low to be restricted. Does soot load in g suggest anything different?




It's always shown as gauge, so 0.65bar would be less than atmospheric? How does that happen?

So it did actually go higher pre regen it did go to .29 on Icarsoft bar reading and slightly higher so 290 millibar on hard throttle so definitely an increase on pressure pre regen - don’t know if that is blocked, regen is running fine like I say but it it literally every 50 miles

 

[OneForTheRoad]

Nope

By design or mapped out ?

 

[talljay]

By design or mapped out ?

Design - the car does have a DMS remap

 

[kam09]

Design - the car does have a DMS remap

I would just gut the dpf out..

 

[WilliamParsons]

If it's still only reaches 80mbar that's too low to be restricted. Does soot load in g suggest anything different?




It's always shown as gauge, so 0.65bar would be less than atmospheric? How does that happen?

Yes, 0.65 bar gauge pressure is less than atmospheric pressure. It happens because the pressure measurement you see is relative to atmospheric pressure, not the absolute pressure.

 

[OneForTheRoad]

Yes, 0.65 bar gauge pressure is less than atmospheric pressure. It happens because the pressure measurement you see is relative to atmospheric pressure, not the absolute pressure.

1.01 bar is sea level , so not sure where this guy parks his car . Halfway up Everest??

 

[Supernoodle]

I guess obvious question to OP is when was the remap done relative to the problems?

Going back to the EBP thing just to prove my point, at key on engine off, it's reading baro.



At idle here it is 1.4bar



So the 0.65bar as a bottom of range as an absolute pressure is too low, but also as a gauge pressure it's too high.

 

[stressd]

When the soot gets burnt off, it leaves behind some ash (much like a charcoal bbq). Regens don't get rid of that ash, it stays in the dpf and eventually fills it up. AFAIK, that can take around 100k miles, and it's likely the 500k miles life expectancy is for the actual metals inside.
I suspect this is your problem, and you need the dpf to be removed and flushed out.

 

[Tonygw]

Just reading this thread and wondering, could the issue not actually be the dpf at all, but the engine is running incorrectly causing excessive soot, choking the dpf in record time and forcing a regen?

You might be curing the symptoms but not the cause?

 

[Petrol Pete]

Isnt a regen just like one of those self cleaning ovens ? Locks it's door , get's crazy hot and burns everything to soot which must then be swept out by hand . But the soot remains inside the Dpf unit , impossible to remove ?

Old man Diesel must be spinning in his grave at what they have done to his relatively simple clever invention.

 

[ALFAitalia]

Old man Diesel must be spinning in his grave at what they have done to his relatively simple clever invention.

....but at very low revs...and very high torque!

 

[tygertyger]

A mate of mine has just had to spend £2k unblocking virtually everything on his Toyota because he has a diesel and never does long trips

 

[stressd]

A mate of mine has just had to spend £2k unblocking virtually everything on his Toyota because he has a diesel and never does long trips

Time to have his dpf gutted.

 

[ALFAitalia]

Yeah...who needs an MOT anyway!

 

[SpikyMikey]

....but at very low revs...and very high torque!

.....and muttering in a rather clattery way.

 

[talljay]

Update - fixed

So the remap I have was done when I bought the car over 5 years ago so not an issue in relation.

I cleaned dpf with cleaner and whilst removing air filter pipe noticed I had a tear on intercooler air pipe - bingo !!

Replaced this and no more dpf issues so assuming this was causing some sort of air / diesel mix issue and causing dpf to fill quickly , cleaned and now filling up at expected rate