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

  1. 17th July 2021, 02:04 PM #1
    cds900 Guest

    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
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  2. 17th July 2021, 02:58 PM #2
    PhilipA
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    wet air cleaner element?
    Regards PhilipA
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  3. 17th July 2021, 03:00 PM #3
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    RobMichelle
    RobMichelle is offline Master Subscriber
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    Bad fuel, fuel filter blocking, maf sensor, water in air filter, injector washers, oil in ecu plug.
    Just thinking out loud
    Rob
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  4. 17th July 2021, 03:01 PM #4
    Markf
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    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, that’s just off the top of my head. Others will have more, and possibly better, ideas.
    Cheers,
    Mark F...
    Vk3KW

    2002 D2 Td5 auto - current AKA The Citrus Money Pit
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  5. 17th July 2021, 03:03 PM #5
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    RobMichelle
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    Ok f it’s 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
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  6. 17th July 2021, 03:11 PM #6
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    V8Ian
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    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
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  7. 17th July 2021, 04:22 PM #7
    cds900 Guest
    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
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  8. 17th July 2021, 04:50 PM #8
    cds900 Guest
    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
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  9. 17th July 2021, 05:28 PM #9
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    reefmagnet
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    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.
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  10. 17th July 2021, 06:38 PM #10
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    V8Ian
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    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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