Driveway moment: how long does a regeneration take?

[phil keegan]

I’m still on my first tank of diesel in a new Coast. After a long day (4am-6pm) mainly at work I pulled into our drive and suspected a regeneration was occurring (higher idling revs, start/stop not activating). I sat there with the engine running wondering how long a regeneration might take to complete. Eventually impatience/fatigue got the better of me (I’m not very patient) and I turned the engine off and went inside (to a waiting G&T). My question is to those who try not to turn the engine off when a regeneration is occurring/suspected is how long might a ‘driveway moment’ take in these circumstances? Thanks for your advice.


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[Perfectos]

I’m still on my first tank of diesel in a new Coast. After a long day (4am-6pm) mainly at work I pulled into our drive and suspected a regeneration was occurring (higher idling revs, start/stop not activating). I sat there with the engine running wondering how long a regeneration might take to complete. Eventually impatience/fatigue got the better of me (I’m not very patient) and I turned the engine off and went inside (to a waiting G&T). My question is to those who try not to turn the engine off when a regeneration is occurring/suspected is how long might a ‘driveway moment’ take in these circumstances? Thanks for your advice.


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Duration is not a fixed duration, but generally I experience anything from 10 minutes to Twenty five minutes for a Regen .
if you do decent mileage don’t worry about it, next time you start up and the engine gets to temperature it will regen over the journey.
problems only occur when multiple regenerations fail to complete

 

[willwander]

It always happens on the drive

 

[Amarillo]

It always happens on the drive

Sounds like a jet engine firing up…

 

[chockswahay]

We’ve done 3000 miles in ours now (18k on the clock) and I have never been aware of a regen once

My sons T6 Kombi seems to regen on the drive every other day

Mine is doing a regen …….. isn’t it?

 

[Lambeth Cali]

We’ve done 3000 miles in ours now (18k on the clock) and I have never been aware of a regen once

My sons T6 Kombi seems to regen on the drive every other day

Mine is doing a regen …….. isn’t it?

I‘ve never noticed it. I’ve had mine 13 years. Would I notice slightly higher revs? Sometimes the bonnet feels very hot!? Whenever I get out I am knackered and have to unload for half an hour.

The regen ideally/normally happens when you’re on a drive, so you probably wouldn’t notice. The “It always happens on the drive” was a joke!

 

[WelshGas]

We’ve done 3000 miles in ours now (18k on the clock) and I have never been aware of a regen once

My sons T6 Kombi seems to regen on the drive every other day

Mine is doing a regen …….. isn’t it?

Maybe maybe not. What year is the vehicle?

 

[ArunAlec]

6years and never heard mine fire up! But, we only ever do longish trips, normally involving a good bit of motorway. Hardly ever do short stop/start trips.

 

[soulstyledevon]

6years and never heard mine fire up! But, we only ever do longish trips, normally involving a good bit of motorway. Hardly ever do short stop/start trips.

I’ve driven 200 miles and the van decides to regen at the end of my trip…

 

[chockswahay]

Maybe maybe not. What year is the vehicle?

MY2020 2 years old now

 

[WelshGas]

MY2020 2 years old now

An OBD module, like Carista will tell you if regeneration are taking place and the status of the DPF..
Make sure you run with a minimum of 1/4 tank for only short periods. Running with low fuel levels constantly stops regeneration.

 

[chockswahay]

An OBD module, like Carista will tell you if regeneration are taking place and the status of the DPF..
Make sure you run with a minimum of 1/4 tank for only short periods. Running with low fuel levels constantly stops regeneration.

Thanks @WelshGas, we run the van from full to low then always back to full each time (old habits) and also rarely do short journeys. I like the idea of an OBD module

 

[phil keegan]

An OBD module, like Carista will tell you if regeneration are taking place and the status of the DPF..
Make sure you run with a minimum of 1/4 tank for only short periods. Running with low fuel levels constantly stops regeneration.

Thanks - very helpful. My van came with Edition 11.2021 of the owner’s manual. Page 301 has a page on this issue and refers to buttons for postponing and starting regeneration in the centre console. I assume this will be a feature appearing in newer vans to help address this problem but hasn’t made it into a Coast delivered on 9/6/22.


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[James Freeman]

Does the regen not carry on once the ignition has been turned off?

 

[Lambeth Cali]

Does the regen not carry on once the ignition has been turned off?

It can't. You might hear the fans still going. Its not a problem, it will just do it next time its needed.

 

[Stu@rt]

Does the regen not carry on once the ignition has been turned off?

My understanding is that the process is setting fire to expensive diesel in a bid the burn the soot out of the DPF. Crazy high temps....600-700 Celsius, so when the process gets interrupted by you switching off those fans kick in to bring those sky high temps back down as a safety precaution

 

[Perfectos]

Does the regen not carry on once the ignition has been turned off?

The regen works by over fuelling on the Exhuast stroke, the un burnt fuel enter the DPF where it ignites and burns off the built up carbon, thus cleaning the DPF. Sensor front and rear record / measure the difference in carbon and trigger the Regen until both sensor read approximately the same. (Hence duration of regen is not a fixed duration)

when you switch off the engine, the fuel stops as does the engine, so the Regen process stops.