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Thread: Severe power loss - help needed!

  1. 18th January 2017, 08:34 AM #1
    Cloughy
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    Severe power loss - help needed!

    161217B.xls

    I have had an ongoing issue with lack of power right through the rev range.
    I cannot maintain 100km/hr in 5th gear on flat ground towing a 900kg trailer.
    The vehicle is strugling to accelerate at all below about 2200 rpm. Even with out the boat on the back, it is difficult to maintain 5th gear.
    I have replaced the MAF with a Seimens unit, cleaned the MAP with contact cleaner - no great improvement.
    I have created a short trip log in the Nanocom, downloaded it and hopefully managed to attach it to this post.
    I am hoping some of you very knowledgeable guys can give me some advice as to what these results indicate.
    Thank you in anticipation
    Cloughy
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  2. 18th January 2017, 08:53 AM #2
    sharmy
    sharmy is offline Master Supporter
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    Sounds like it is overboosting, You can check by bypassing the wastegate module by running a tube direct from the aftercooler pipe to the waste gate accuator. It can be caused by split rubber hoses or a faulty module, they are not expensive to replace.Presuming it is a td5
    John
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  3. 18th January 2017, 09:20 AM #3
    johnb44
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    unplug the maf to rule it out and have a drive made a hell of a difference when I did it to mine thus a new maf and then a remap car is a rocket now
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  4. 18th January 2017, 12:20 PM #4
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    sierrafery
    sierrafery is offline YarnMaster Silver Subscriber
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    Hi, the attachment should be the format i converted it

    as about the problem, it's clearely visible that there's no power, actually no suction cos the MAF doesnt exceed 280 while the MAP gets to max 140...
    1. if you still have EGR make sure it's not clogged,
    2. if it's the newer modell with a catalist this can be clogged as well(undo the downpipe from the turbo and make a short drive test)
    3. make sure there's no restriction in the air intake/air box
    4. it can be low fuel pressure too
    Attached Files Attached Files
    Discovery Td5 (2000), manual, tuned
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  5. 18th January 2017, 01:17 PM #5
    Cloughy
    Cloughy is offline Fossicker Supporter
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    Thanks all.
    Suggest I should have given some more info, and yes it is a TD5 :
    EGR - GONE
    Cat - GONE
    MAF - replaced 10,000 kms ago (have disconnected last week and no improvement)
    New Air Filter
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  6. 18th January 2017, 01:20 PM #6
    Cloughy
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    Also forgot to say all Turbo hoses replaced.
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  7. 18th January 2017, 01:24 PM #7
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    sierrafery
    sierrafery is offline YarnMaster Silver Subscriber
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    Then it's low fuel pressure or clogged intercooler IMO
    Discovery Td5 (2000), manual, tuned
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  8. 18th January 2017, 01:41 PM #8
    kelvo
    kelvo is offline Wizard Subscriber
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    My money is on your fuel pump.
    2014, MY14 Discovery TDV6, Fuji White (2018-Now)
    2003, Discovery 2a, Td5 Manual, Zambezi Silver (2012-2018)
    2007, Adventure Offroad Campers, Grand Tourer (2015-Now)
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  9. 18th January 2017, 01:45 PM #9
    Cloughy
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    There is also quite a lot of black smoke on "attempted" acceleration.
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  10. 18th January 2017, 02:09 PM #10
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    alien
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    Recheck the hoses.
    The black smoke may indicate a delaminated hose or loose clamp/hose.
    Cheers, Kyle



    The Good Oil.
    When did you last visit?
    http://www.aulro.com/afvb/good-oil/


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