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  #26  
Old 03-26-2018, 06:03 PM
eric_dot_com eric_dot_com is offline
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Quote:
Originally Posted by Doug Huffman View Post
Soot mass drop is the definition of regeneration. There are three regeneration mechanisms; passive that will go on continuously under proper conditions, ECU induced under proper conditions by throttle valve adjustment and late fuel injection, and forced that you are discussing.


Ooh ok so there are 3 type of regen cycles. Thatís the first time Iíve ever heard that. I guess that makes perfect sense now. The automatic regen 200-350 Miles intervals (passive), then driving the car for at least 30 min w minimum 50mph (ECU induced)and finally the forced regen cycle using Carly or other.

What would happen if a regen (passive or ECU induced) was happening but you are un aware of the sound coming out of under the hood because sometimes I literally canít tell unless itís a quiet street or when Iím parked in my driveway or even worst, Iíll park the car in driveway turnoff the engine and as soon as I get out I hear the regen and Iím like...daaaang it ! Lol


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  #27  
Old 03-26-2018, 06:06 PM
MTSMO MTSMO is offline
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Hey guys glad this thread was bumped back up. I bought a new SCR Metering Valve back in October as the dealer had recommended it purely based on a code but after a code clearing no additional errors came back. Fast forward to this past week and on start-up I have noticed a bubbling type sound coming from the area under the rear passenger side compartment. I noticed some fluid dropping as well similar to A/C condensation. Does this sound like a leak from the metering line? I have already had the SCR tank replaced under warranty about 30K miles ago.

Thanks for the feedback.
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  #28  
Old 03-27-2018, 08:56 AM
mattebury mattebury is offline
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Quote:
Originally Posted by eric_dot_com View Post
What would happen if a regen (passive or ECU induced)
You will not be able to detect a passive regen. This happens "naturally" when the right operating conditions are present to burn off the trapped soot in the DPF without any intervention from the ECU.
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  #29  
Old 03-27-2018, 01:54 PM
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Doug Huffman Doug Huffman is offline
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Originally Posted by eric_dot_com View Post
What would happen if a regen (passive or ECU induced) was happening but you are un aware ... turnoff the engine ...
No fuel, no oxygen, no heat, regeneration ends.
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  #30  
Old 03-27-2018, 05:04 PM
eric_dot_com eric_dot_com is offline
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Originally Posted by mattebury View Post
You will not be able to detect a passive regen. This happens "naturally" when the right operating conditions are present to burn off the trapped soot in the DPF without any intervention from the ECU.


Ok I guess when a passive regen is happening and you are in aware of it and when it actually happening in your drive unfortunately it will automatically end the process ?


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  #31  
Old 03-27-2018, 05:07 PM
eric_dot_com eric_dot_com is offline
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Originally Posted by Doug Huffman View Post
No fuel, no oxygen, no heat, regeneration ends.


Basically you have to wait for the next one ? I guess what Iím trying to say is will ending the passive regen have any effect on the car or is it just only prevent the burning of the soot thus its still needs to be burn on the next regen Iím guessing


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  #32  
Old 03-27-2018, 05:20 PM
mattebury mattebury is offline
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Originally Posted by eric_dot_com View Post
Ok I guess when a passive regen is happening and you are in aware of it and when it actually happening in your drive unfortunately it will automatically end the process ?
I don't think you understand what passive regeneration is. It's not something that you can control or the ECU can control, you'll never know it's happening. A passive regen is just that, it's passive. It happens when conditions are just right for the natural heat in the exhaust system to burn off the soot in the DPF. You could have those conditions and have no soot to burn off, but the car is going to do nothing different than what it is currently doing.

So don't worry about interrupting a passive regen because there is nothing to interrupt.
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  #33  
Old 03-27-2018, 08:12 PM
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floydarogers floydarogers is offline
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Originally Posted by mattebury View Post
...
So don't worry about interrupting a passive regen because there is nothing to interrupt.
Perhaps SPONTANEOUS would be a better word?
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  #34  
Old 09-26-2019, 06:48 AM
JohnMN JohnMN is offline
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Just replaced the SCR metering valve on my 2009 X5 in response to code P2063. Check engine light is now off. Quick easy fix. Thanks for the post!
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