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Old 14-09-18, 05:54 PM   #1
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Default permanent regeneration?

HI, after sorting the 'hiccups' I've noticed that the state of regen in Diagbox is always 'regeneration'. It remains the same if the soot is 2% or 75%. The car is a 2.0l hdi 136 2006, all actuators have been checked in diag. The exhaust pressure diff goes from 0 mbar idle to 26 at 2000 on the road. the fuel mpg is good, mainly motorway at 75mph gives 53mpg.
Any ideas gratefully received.
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Old 14-09-18, 11:16 PM   #2
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"The exhaust pressure diff goes from 0 mbar idle to 26 at 2000 on the road."

I fitted a brand new DPF (coming up on that time), it was 4mbar on idle for me. Your pressure sensor might be faulty? There should always be a differential pressure.
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Old 15-09-18, 08:32 AM   #3
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Thanks, I'll get under it today to see if there's anything obvious
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Old 15-09-18, 11:43 AM   #4
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My data was incorrect.

On my old filter which was "fully working", the differential pressure was 4mbar and 6mbar when pretty full of soot on idle. A brand new DPF (maybe 2 miles of driving on it) was 2mbar on idle.

On the brand new DPF -

4th Gear, Wide Open Throttle at 4500rpm (~115mph) it was 130mbar. EGT was 550c

6th Gear, Partial Throttle/flat road at 1800rpm (60mph) it was 20mbar. EGT was 200c

So that's some data for you to compare to yours... your DPF substrate might be cracked internally or the pressure sensor faulty, I doubt you would see anything just by looking though.
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Old 15-09-18, 03:22 PM   #5
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Thanks for the comparisons, mine sits at 0 on idle, irrespective of soot levels. Goes up 25 mbar possibly 30 under moderate acceleration then returns to 0 when the speed has levelled out at say 50mph, so something not right there. Just looked underneath for any obvious damage, all OK. I take it the two steel pipes that disappear up into the engine compartment connect to the sensor that works everything out. Would you happen to know where this is please and if there is a method of testing. It's just gone through a French CT on the new regs so I don't think the DPF has been played with, also the previous owner isn't the type.
Thanks for your help so far.

Last edited by moizeau; 15-09-18 at 03:25 PM.
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Old 16-09-18, 09:30 AM   #6
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That'll be this screen is it? (Parameter measurements for DPF.)

I've noticed that my 407 (2.2 4HT) triggers a regen at about 65% soot and our 508 (2.0 140 RHF) triggers at 75%.
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Old 16-09-18, 10:05 AM   #7
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Yep, that's the screen, mine always says 'regeneration', even without the engine running, just the ignition on!
Thanks for the reply.
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Old 16-09-18, 02:17 PM   #8
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Just been out with FAP running.

DPF differential pressure 4 when idling, 8 or 12 when rolling round suburban streets, about 20 on the ringroad, and up to 75 with foot planted.

Seems to correlate to turbo pressure and engine load.
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Old 16-09-18, 04:49 PM   #9
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Thanks for the info. Looks like I need to check the pipes going to the sensor and the sensor itself, after that FAP off if necessary. Can't disturb any thing this week 'cause I need to take my daughter to Uni. Something for when I get back.
Thanks again
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Old 16-09-18, 05:31 PM   #10
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What are the values of the distance since last and distance between last two regens?

Should be about 400km between the last two.

What is the current soot load?

What sort of temperature does the exhaust get to? Should be at most about 250 normally but over 400 during a regen.
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