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freelander 2 2.2 2007 dump valve noise ?????

Discussion in 'Land Rover Freelander' started by nick the gin, Sep 24, 2021.

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  1. nick the gin

    nick the gin Member

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    hi strange noise when you let off the throttle at 2000 rpm sounds like a kids dump valve going off
    and when it does it puffs out grey smoke ????
    any ideas lads ???
     
  2. Nodge68

    Nodge68 Well-Known Member

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    Sticking or damaged throttle body would be a good place start looking.
    Also look for boost pipe splits, or a combination of sticking TB and split boost pipe, as both are pretty common, especially on a 14 year old FL2.
     
  3. nick the gin

    nick the gin Member

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    surely the tbhousing would come up on the obd ? no ?
     
  4. Nodge68

    Nodge68 Well-Known Member

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    Not necessarily.
    The FL2 really needs to have and air path test routine run using SDD, which will cycle the TB, test for boost leaks, and confirm the boost logged is consistent with the air flow measurement at the MAF.
    If you don't have access to SDD, then the only checks you can do is to check all the boost pipes for splits, and check the drive gears in the TB housing.
     
  5. nick the gin

    nick the gin Member

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    right drove it for 30 miles today and finaly went into limp home mode with fault code P0234-00 any more ideas ???????
     
  6. Nodge68

    Nodge68 Well-Known Member

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    The description of that code is linked in my signature.;)
    But it's here, if you're struggling to see it.

    Screenshot_20210928-181017_Samsung Internet.jpg

    So you could have a sticky boost control actuator, or possibly a sticky throttle body. The TB is the easiest thing to check, so do that first, then move on to checking the turbo boost control actuator, if the TB condition is good.
     
  7. nick the gin

    nick the gin Member

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    in your signiture ????
    cant click on big lettering ??
     
  8. nick the gin

    nick the gin Member

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    attachmentbdont work ??
     
  9. J_D

    J_D Active Member

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    raywin likes this.
  10. nick the gin

    nick the gin Member

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  11. J_D

    J_D Active Member

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    maybe if its still creating pressure.
     
  12. nick the gin

    nick the gin Member

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    so no one thinks it may just be a split pipe ?
     
  13. Nodge68

    Nodge68 Well-Known Member

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  14. Nodge68

    Nodge68 Well-Known Member

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    You shouldn't get an overboost code with a split hose, but hoses should have been checked already, as I suggested in post #2. ;)
     
  15. nick the gin

    nick the gin Member

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  16. nick the gin

    nick the gin Member

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    not looked yet will do morrow
     
  17. Nodge68

    Nodge68 Well-Known Member

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    It's on the EGR intake assembly, just above the throttle body.
    Here's a diagram of the whole system.
    Screenshot_20210929-073636_Gallery.jpg
     
    Last edited: Sep 29, 2021
  18. nick the gin

    nick the gin Member

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    thanks nodge whats the best access for waist gate linkage access ? from above or below ? also on the lower pipe coming from the intercooler there is a big valve incorperated in that pipe what is it ?? tia
     
  19. Nodge68

    Nodge68 Well-Known Member

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    It's a boost control actuator, rather than a dump valve. Modern turbos use movable vanes, instead of dump valves, so the vanes need accurate control using an electronic actuator. ;)
    Do you mean the throttle body?

    That's part of the emission control, closing at times in the drive cycle, aiding EGR effectiveness. The throttle butterfly is also closed when the ignition is turned off, so the engine stops smoother, and also prevents running on, should oil be in the combustion chamber.
    It's quite common for the plastic gears for the butterfly drive to fail, given strange running issues.
     
  20. nick the gin

    nick the gin Member

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    So what's best access to the to the linkage from the control valve to the vains??
     
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