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Thread: Td5 engine surging on off above 2200 rpm

  1. 6th October 2015, 01:52 PM #1
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    Dgd69
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    Td5 engine surging on off above 2200 rpm

    Hi the disco now has developed a problem where above 2200 rpm it surges on off like a over boost problem

    Have new maf
    Boost control
    Air filter
    Cleaned intercooler
    Silicon hoses
    New injector harness
    No oil in red ecu plug
    Lengthened rod to see if it over boost but not fix

    It is also worse when cold

    Thanks in advance
    1960 series 2 143001010
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  2. 6th October 2015, 02:29 PM #2
    Tombie Guest
    Check

    • For Stuck wastegate
    • Fuse for MAF
    • chaffing of wiring
    • IAP sensor dirty
    • Fuel pump (low flow)
    • Fuel Reg
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  3. 6th October 2015, 02:51 PM #3
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    Dgd69
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    Cheers will do
    1960 series 2 143001010
    1976 series 3 91331709c
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    2014 discovery tdv6
    2010 cub supamatic drover
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  4. 6th October 2015, 05:03 PM #4
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    sierrafery
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    Plug in a tester before you spend more money based on presumptions
    Discovery Td5 (2000), manual, tuned
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  5. 6th October 2015, 06:11 PM #5
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    This is a new one those were things replaced for other faults with the disco
    1960 series 2 143001010
    1976 series 3 91331709c
    06 discovery v6
    2014 discovery tdv6
    2010 cub supamatic drover
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  6. 6th October 2015, 07:28 PM #6
    Jazzman
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    I had the same issue at 3000 RPM. It was my boost fluctuating. I turned my boost down and the problem went away BUT ended up with high EGT. This was a result of the wastegate / boost actuator like Tombie mentioned.

    However I've had this issue before and fixed it by cleaning or replacing the sensor that is in the boost hose from the turbo to the intercooler input pipe. I think this might be the IAP sensor Tombie is also referring to but not sure. It is also possible to bypass it and unplug it, but be aware this may also change you boost settings.
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  7. 7th October 2015, 09:42 AM #7
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    Quote Originally Posted by Jazzman View Post
    I had the same issue at 3000 RPM. It was my boost fluctuating. I turned my boost down and the problem went away BUT ended up with high EGT. This was a result of the wastegate / boost actuator like Tombie mentioned.

    However I've had this issue before and fixed it by cleaning or replacing the sensor that is in the boost hose from the turbo to the intercooler input pipe. I think this might be the IAP sensor Tombie is also referring to but not sure. It is also possible to bypass it and unplug it, but be aware this may also change you boost settings.
    There is two air pressure sensors. Ones in the Airbox lid (AAP- Ambient air pressure) the other is in the inlet manifold (IAP - inlet air-pressure).
    The one that runs from the waste-gate to the pipe that runs to out of turbo to inter cooler is the waste-gate modulator.

    Pretty sure that is correct.
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  8. 9th October 2015, 12:18 PM #8
    Jazzman
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    Turns out my problem was never the turbo. It appears to be the AAP sensor in the air box, i disconnected it and the engine is much smoother. New one on order from Roverlord.
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  9. 9th October 2015, 07:02 PM #9
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    Thanks everyone away in the bush for work will try aap sensor when back
    1960 series 2 143001010
    1976 series 3 91331709c
    06 discovery v6
    2014 discovery tdv6
    2010 cub supamatic drover
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  10. 9th October 2015, 08:53 PM #10
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    sierrafery
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    The AAP sensor doesnt have such kind of default as the MAF so unplugging it you'll only mask other issue cos the default for it is to limit the boost to 1 bar, only symptom which can be improved by unplugging it if it's faulty is if you have excessive black smoke... the only certain way to rule out the AAP sensor is by reading it's live input with tester or if you get ambient pressure related fault code, IMO it's too expensive as new to buy one only based on the fact that the engine is running better with it unplugged
    Discovery Td5 (2000), manual, tuned
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