Defender Defender Td5 surging under acceleration





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  1. #1
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    Default Defender Td5 surging under acceleration

    Hi All.

    I'm sure there has been numerous posts regarding this issue but I just can't seem to figure it out.

    Recently did a trip to Paternoster with my 2002 Defender 90 td5 and she ran beautifully as always.
    Got back last week and haven't been driving much.

    Last night I took a trip to the beach and when going up hill and accelerating the engine "surges" quite badly, everything in the car including the missus was jolting back and forth.

    Noticed when going downhill and putting my foot down the problem isn't there or at least not nearly as bad.

    This morning I checked the MAF sensor and cleaned it, checked the Red ECU plug (clean) checked the wastegate on the turbo and sprayed with some Q20, although it's tight, it does move. Cleaned the air filter and checked the Turbo (clean of oil and spins freely by hand)

    Just took the car for a drive again to see if maybe somehow it has sorted itself out but no luck !! Disconnected the MAF and still the car surged badly under heavy acceleration.


    Any thoughts or Ideas would be greatly appreciated!

    Thanks in Advance

  2. #2
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    Default Re: Defender Td5 surging under acceleration

    Possibly dirty fuel filter or air getting in system. Maybe even fuel pump failure.
    Pieter Greyling
    ONE LIFE, LIVE IT!
    ORRA: Z85

    -Land Rover Defender 110 Td5
    -BMW G650 xChallenge

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  4. #3
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    Default Re: Defender Td5 surging under acceleration

    Hi Pieter,

    thanks for the prompt response.

    I will check the fuel filter in a bit and report back.

    I think the pump is still good as it runs when it should and isn't noisy,

    Had a problem about a year ago where there was air in the system, pump was very noisy but replaced the Injector o-rings and washers and that sorted the problem. haven't had any issues since.

    I hope it is just a dirty filter.

  5. #4
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    Default Re: Defender Td5 surging under acceleration

    Just to add, usually when it hits overboost on a defender it goes into limp mode and cuts fuel until you reset by switching on and off.

    On discoís it cuts fuel on and off to protect the engine. Thatís maybe what youíre experiencing?

    Easiest way is to fit a temp boost gauge and see whats happening.
    '02 LR 90 2.8i (SWAMBO)
    '99 TD5 Hardtop (pa se wa)

    It's a Land Rover thing... and I get it now

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  7. #5
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    Default Re: Defender Td5 surging under acceleration

    Hi Louw.

    It does feel like the fuel is being cut, (on & off) like you said.
    It surges untill I let my foot off the pedal then it's back to normal until I try and accelerate hard again.

    Will see if I can find a temp boost guage.

    thanks for the insight.

  8. #6
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    Default Re: Defender Td5 surging under acceleration

    Plesier Theo,

    As die gauge in is sal jy sommer gou sien as dit die fout is en dan kan jy die wastegate stel todat die boost binne perke bly.

    Myne is permanent in ek gebruik dit as ek wil ekonomies ry- dis n goeie manier om jou engin te monitor.

    Hoop dis jou probleem want dis n maklike fix
    '02 LR 90 2.8i (SWAMBO)
    '99 TD5 Hardtop (pa se wa)

    It's a Land Rover thing... and I get it now

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  10. #7
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    Default Re: Defender Td5 surging under acceleration

    Mine recently went into limp mode and also thought it was overboost. Turned out to be a faulty MAP sensor reading way too high. Try give that a clean as well.
    Pieter Greyling
    ONE LIFE, LIVE IT!
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    -Land Rover Defender 110 Td5
    -BMW G650 xChallenge

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  12. #8
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    Default Re: Defender Td5 surging under acceleration

    Probably the injector wiring harness.
    About R800 if I remember correctly and you will need a new "tappet cover" gasket.
    Chris

    "Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing" Helen Keller

    1996 Range Rover P38 4,6 HSE
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  14. #9
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    Default Re: Defender Td5 surging under acceleration

    Clean the manifold air pressure sensor and the ambient air pressure sensor in the airbox..might as well clean the crank position sensor as well while you're in cleaning mode.
    check all turbo related pipes to make sure they're not delaminated inside.

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  16. #10
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    Default Re: Defender Td5 surging under acceleration

    Check earth points and power supply to fuel pump. I had very similar symptoms on mine, was earth cable.
    1999 Land Rover Defender 90 Td5
    2003 Yamaha YZ250
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  18. #11
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    Default Re: Defender Td5 surging under acceleration

    Hi all,

    Thanks for the replies and thoughts regarding my problem.

    I doubt that it will be the injector wiring harness, replaced that along with the injector washers and o-rings less than a year ago.

    Will definitely check and clean the MAP, AAP, Crank sensor, turbo hoses and earthing points today and see if that will sort the problem.

    Will report back as soon as it's done!

    Have a great day!

  19. #12
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    Default Re: Defender Td5 surging under acceleration

    Have you checked the air filter?
    Chris

    "Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing" Helen Keller

    1996 Range Rover P38 4,6 HSE
    1977 LandRover Series III 109" Project

  20. #13
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    Default Re: Defender Td5 surging under acceleration

    Hi Chris,

    The air filter was probably the first thing I checked and cleaned, quite new as well as I serviced the car about 2500km ago.

    Will check all the other things later and hopefully get it sorted.

  21. #14
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    Default Re: Defender Td5 surging under acceleration

    Having had the problem very recently.. sounds like over-boost to me.
    2004 Land Rover Discovery 2 Td5 ES

  22. #15
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    Default Re: Defender Td5 surging under acceleration

    High pressure side Air hose between intercooler and engine, has a crack in it that you canít easily see at idle.

    Under boost the crack eventually opens. This drops the effective boost pressure and the car has less power.

    Once some of the air has escaped and the pressure in the pipe is lost, the crack closes and the boost pressure is re-established, causing the car to once again accelerate until the pressure is sufficient to open the crack again.

    This opening and closing of the crack causes varying boost pressure and the surging that you experience.
    Cheers

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  23. #16
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    Default Re: Defender Td5 surging under acceleration

    Quote Originally Posted by Theo Botha View Post
    Hi Chris,

    The air filter was probably the first thing I checked and cleaned, quite new as well as I serviced the car about 2500km ago.

    Will check all the other things later and hopefully get it sorted.
    Cool, mine ate the airfilter once
    Chris

    "Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing" Helen Keller

    1996 Range Rover P38 4,6 HSE
    1977 LandRover Series III 109" Project

  24. #17
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    Default Re: Defender Td5 surging under acceleration

    As mentioned, surging can only be caused by fuel pressure variation or boost variation.

    Fuel pressure was an issue with some TD5s. The FPR is possibly a culprit.

    Otherwise, as Fluffy says, you have a hose problem, or else you have a problem with the injection pump/ECU registering manifold pressure.
    Last edited by jelo; 2018/03/27 at 08:32 AM.
    2012 Jeep Sahara Unlimited 3.6 V6
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  25. #18
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    Default Re: Defender Td5 surging under acceleration

    Reporting back as promised.

    Used contact cleaner to clean the MAP, MAF, AAP and all the earthing points I could find.
    Checked the hoses for anything obvious or delamination, found nothing.
    Cleaned the air filter again.
    Drained the fuel filter and did the auto bleed (pedal 5 times)

    went for a quick test drive and everything was back to normal again!! YAY!!!

    Must've been something mentioned above causing the "SURGING".

    What do you guys think was the culprit? my bet is on the MAP, because that was the only part I didn't clean yesterday.

    Thanks everyone for all the help!
    Now I can plan my next trip again!

  26. #19
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    Default Re: Defender Td5 surging under acceleration

    Awesome!
    Cheap fix then
    Chris

    "Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing" Helen Keller

    1996 Range Rover P38 4,6 HSE
    1977 LandRover Series III 109" Project

  27. #20
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    Default Re: Defender Td5 surging under acceleration

    Get it on a nonocom or hawkeye. It will tell you if map is finished
    Pieter Greyling
    ONE LIFE, LIVE IT!
    ORRA: Z85

    -Land Rover Defender 110 Td5
    -BMW G650 xChallenge

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