HELP SPRINTER V6 Dropping Boost

Discussion in 'Engine' started by HymerS830, Jul 20, 2017.

  1. HymerS830

    HymerS830 New Member

    Messages:
    1
    Joined:
    Jul 20, 2017
    Car:
    Sprinter
    My 2007 Sprinter V6 is losing boost it changes up through auto box and when in top gear say on an incline and you put foot down it will get boost pressure then all of a sudden loses power basicaly no boost again until it is over 3000rpm just no go about it if I stop engine and restart it is perfect then will do the same after a mile or so, no fault codes show up can anyone give me any clues
     
  2. 6cyl

    6cyl Hardcore MB Enthusiast

    Messages:
    335
    Joined:
    Aug 15, 2013
    Location:
    London,UK.
    Car:
    CLS320 CDI
    get the codes read on a Star machine.

    If it was a VW or a BMW I'd be looking at the turbo and associated sensors. Particularly the variable vane solenoid or boost sensors. Perhaps someone with better knowledge of the MB V6 tdi can chime in?
     
  3. grober

    grober MB Club Veteran

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    27,471
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    Jun 22, 2003
    Location:
    Perth, Scotland
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  4. Tuercas viejas

    Tuercas viejas Hardcore MB Enthusiast

    Messages:
    478
    Joined:
    Mar 26, 2017
    Location:
    Denver
    Car:
    landrover/rolls royce/MB AMG S600/Prius
    I/we work on a lot of Sprinters --about 4 to 6 per day.
    A scan code mention would be helpful, live data outputs best!.

    Going by experience and pattern failures your most likely problem is to do with the charge pipe tract to the throttle body..
    Try doing a stall test with an assistant listening for the whoosh of charge air escaping.
    Most likely places are the dog leg elbow O ring off the turbo,. the silencer O rings and sleeve, the toilet P trap charge hoses to the charge air cooler both sides (they split ) and the joint sealed by a square section O ring at the throttle body. It comes loose

    Frankly this is the WORST air charge system I have yet seen on a diesel --Frankly its bitty and its junk. :fail

    Also always check the orange sleeve at the turbo inlet tract . MB recommends a change out EVERY time you disturb it. It has sealing problems causing MAF sensor mal functions

    If the rig has been running for any length of time then the DPF might be choked up. Anything more than 6 grams of soot/ash. will shut it down due to excessive bank pressure .
    This where the scanner comes in useful since the EBP and differential pressures sensor read out might be the real indicator as to what is the problem! Plus drift on the major pressure sensors ! Anything more than 25 HPa will cause the issues you are mentioning.
    I hope this is helpful.
    Regards
    Tuercas Viejas
     
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