1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

What supposed to happen during a DPF regen? Diagnosing fault

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by surfer_x, Sep 13, 2017.

  1. surfer_x

    surfer_x Member

    Messages:
    16
    Likes Received:
    0
    Joined:
    Feb 16, 2013
    Location:
    London
    Your Mercedes:
    Sprinter MWB 313 2010yr
    I have sprinter with OM-651 (2010 model) with 185K miles,

    The DPF is NOT blocked, the soot load is reported at less than 10%.

    I managed to get set up the torque app so I could monitor some parameters.

    This is what happens when a regen starts on my vehicle:

    1. the cat temp climbs to 700 degrees, (more fuel injected later?)
    2. the throttle closes to 10% what does the throttle do in diesel engine? or is the something do with the EGR?
    3. Boost is much lower, it goes negative when the engine is on the overrun.

    If a push a little to hard on the accelerator, the regen stops with a boost pressure fault, the boost pressure is not that high maybe 10 or 15 psi. If a stay in a higher gear the regen will complete, and the vehicle carries on light a freight train and pulls just under 23 psi of boot with pedal all the way down.

    My question is what is supposed to happen? and any ideas on the likely fault?
     
  2. LostKiwi

    LostKiwi Senior Member

    Messages:
    5,983
    Likes Received:
    1,209
    Joined:
    Aug 25, 2006
    Location:
    Midlands, not east or west but middle.
    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 04 Smart Roadster Coupe
    Here's a summary of the process.
    You may not have all the warning lights he talks about.

     
  3. OP
    surfer_x

    surfer_x Member

    Messages:
    16
    Likes Received:
    0
    Joined:
    Feb 16, 2013
    Location:
    London
    Your Mercedes:
    Sprinter MWB 313 2010yr
    Thanks, but that's a little basic, was hoping for more details. I understood the extra fuel added later in the cycle, (point 1) but it does not mention anything about throttle settings, waste gate or any other changes to the plumbing of the induction or exhaust, which certainly is happening for me.

    Points 2 and 3

    I suspect there is a leak, a valve is not operating correctly or sensor is not working as it should.
     
    Last edited: Sep 13, 2017

Share This Page