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Thread: Td5 Automatic Discovery 2a suddenly running rough and no top-end power

  1. #1
    Join Date
    Jul 2021
    Location
    Castlemaine
    Posts
    5

    Td5 Automatic Discovery 2a suddenly running rough and no top-end power

    Hi,

    I'm in a bit of a situation with my 2003 Discovery 2 Td5 auto. We drove down here to Warrnambool on Thursday night to my partner's house, about 300 k journey, all fine.

    Problem came when went to shops next evening (for essential items), engine started ok, first click, but appeared a bit rough. On the road it takes off ok, but just bogs down at about 40kmh, especially if there's a hill in sight. No check-engine, no amigos, nothing flashing. Bit of a top-end rattle, but that seems to come and go.

    This is a well-maintained almost 300k car that's just been serviced.

    Random thoughts

    1. It was very rainy when driving down here. Is there anywhere worth checking for water ingress? Parked wet in Tas's garage.

    That's it really.

    Does anyone on here have any suggestions on a fix, or even a suggestion for someone to take it to down here (Warrnambool Vic).

    If we get out of lockdown, we need to get back to Castlemaine, and I'm not confident it's going to make it.

    Thanks, Chris

  2. #2
    Join Date
    Jan 1970
    Location
    Avoca Beach
    Posts
    13,179
    wet air cleaner element?
    Regards PhilipA

  3. #3
    Join Date
    Mar 2015
    Location
    Horsham Victoria
    Posts
    555
    Bad fuel, fuel filter blocking, maf sensor, water in air filter, injector washers, oil in ecu plug.
    Just thinking out loud
    Rob

  4. #4
    Join Date
    Aug 2015
    Location
    Moe
    Posts
    511
    Just off the top of my head check the three little hoses on the boost solenoid, does disconnecting the MAF make any difference. What about the condition of the air filter? Are the boost hoses in good condition ? Not delaminating ?

    As I say, thatís just off the top of my head. Others will have more, and possibly better, ideas.
    Cheers,
    Mark F...
    Vk3KW

    2002 D2 Td5 auto - current
    2000 Disco 2 Td5 Manual - dead and gone
    197? Range Rover - gone
    1973 SWB SIII Diesel, 1968 SWB IIA Petrol, 195? SI Petrol - all gone
    Balance Trailers forward fold camper trailer.
    http://jandmf.com

  5. #5
    Join Date
    Mar 2015
    Location
    Horsham Victoria
    Posts
    555
    Ok f itís just been serviced, did the o ring come off with old fuel filter, when new one fitted, so only one o ring not 2 or is the fuel filter tight and not sucking air as well

  6. #6
    Join Date
    Dec 2007
    Location
    Brisbane West
    Posts
    23,963
    Does it rev OK in neutral? If not, look at fuel pump.
    If you don't like trucks, stop buying stuff.
    http://www.aulro.com/afvb/signaturepics/sigpic20865_1.gif

  7. #7
    Join Date
    Jul 2021
    Location
    Castlemaine
    Posts
    5
    Chaps, thanks heaps for the suggestions

    Engine loom replaced recently, and ECU and plug carefully cleaned out with no further problems, but I'll start looking at the other suggestions.

    Cheers, Chris

  8. #8
    Join Date
    Jul 2021
    Location
    Castlemaine
    Posts
    5
    OK, hands up, who said MAF sensor? Well done!

    Unplugged that and the engine revs again, nasty noise and silliness gone. Didn't try a road test, but I'm sure it's WAY better. Would n't rev over 2500 rpm (in N) previouisly,

    I'm assuming that the ECU has a base map for airflow based on the engine speed, and that this is what it runs from when the MAF is disconnected? Can I drive home like this is the question?

    Airfilter was nice and dry inside, did check there too. Hoses and connectors as suggested all looked ok too.

    Thanks heaps, CHris

  9. #9
    Join Date
    May 2021
    Location
    Mackay
    Posts
    39
    My MAF has been open circuit for ages. Although I don't know how the car would go with it working, the engine runs well enough with it disconnected, with only perhaps a hint of hesitation around the 3000 rpm mark.

  10. #10
    Join Date
    Dec 2007
    Location
    Brisbane West
    Posts
    23,963
    It'll drive fine with the MAF disconnected. Roverlord supply reliable, new MAFs, beware of cheap Chinese "will fit/same as" rubbish.
    If you don't like trucks, stop buying stuff.
    http://www.aulro.com/afvb/signaturepics/sigpic20865_1.gif

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