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Thread: TD5 Power down only while towing

  1. #11
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    Quote Originally Posted by discorevy View Post
    You thinking Elec brakes Simon?

    I'd be changing the fuel filter first just to make sure it wasn't blocked and hard to say without eliminating possible sensor faults with live values on a scan tool but probably fuel pump if it's not been replaced.
    I'm really not sure! The only thing I can think of is as you've said, that the fuel pump is on its last legs as that can be very similar in how it is reacting, but exacerbated under load. For me, LandRover and VDO fuel pumps seem to do approx 120,000km before they fail.

    Edit: The TPS is 5v, I don't think the trailer is effecting that.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  2. #12
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    I’m betting overboost under the extra load.

  3. #13
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    Quote Originally Posted by Tins View Post
    Left field, perhaps, but are we certain the trans isn't going into limp home mode?
    Notes on the file attached, to help:


    1. Turbo Boost reading suddenly goes to Zero, along with EGR Inlet%, EGR Mod% and Turbo Mod%, then they all start reading again together.
    2. EGR Mod does not show any numbers on this file although it did for two seconds at Zero road speed in another file, 10 and 18 readings
    3. Temp was increasing but it was being tested going up a steep road repeatedly, wondering if that's because no EGR cycling?



    • I have checked for oil on the ECU plug, it's clean.
    • New MAF and Turbo modulator and lines renewed.
    • Waste gate serviced
    • Have tried changing the length of turbo actuator arm, test file done with 16 threads showing, I wound it back in case it was an overboost, but didn't make much difference. 14 thread test was similar. Last service by agent it came back with 12 threads!
    • Not seen any overboost errors logged.
    • Fuel pump failed three years ago and was replaced with new one by LR agent, as was the fuel filter.
    • Test for attached file done not towing to see if could replicate it that way, it did, but notice the results less as drive around below the level it goes to zero.
    • It was overboosting and surging before the modulator was replaced, it does not do that now.


    I can problem solve usually, even discovered why I couldn't post here for the last few days!

    "Driver Demand Problem 1" Still appearing but not immediately, has to be driven for a bit. No other errors.

    Any ideas on what I could look at next would be appreciated.
    Attached Files Attached Files

  4. #14
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    Quote Originally Posted by Slunnie View Post
    I'm really not sure! The only thing I can think of is as you've said, that the fuel pump is on its last legs as that can be very similar in how it is reacting, but exacerbated under load. For me, LandRover and VDO fuel pumps seem to do approx 120,000km before they fail.

    Edit: The TPS is 5v, I don't think the trailer is effecting that.
    See post above.

  5. #15
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    Quote Originally Posted by Campdog View Post
    • Fuel pump failed three years ago and was replaced with new one by LR agent, as was the fuel filter.

    Any ideas on what I could look at next would be appreciated.
    Just because it's new doesn't mean it's good. Especially these days.
    ​JayTee

    Nullus Anxietus

    ​Getting involved in discussions is the best way to learn.

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    OKApotamus #74
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  6. #16
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    Quote Originally Posted by Tins View Post
    Just because it's new doesn't mean it's good. Especially these days.
    So is there anything about the nanocom file that indicates a possible fuel pump problem?

  7. #17
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    Quote Originally Posted by Campdog View Post
    So is there anything about the nanocom file that indicates a possible fuel pump problem?
    That's something to ask Shack, discorevy, sierrafery etc, not me. I was merely responding to one of your bullet points. It's not wise to eliminate an item because it was changed three years ago.
    ​JayTee

    Nullus Anxietus

    ​Getting involved in discussions is the best way to learn.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

  8. #18
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    Quote Originally Posted by Campdog View Post
    Notes on the file attached, to help:


    1. Turbo Boost reading suddenly goes to Zero, along with EGR Inlet%, EGR Mod% and Turbo Mod%, then they all start reading again together.
    2. EGR Mod does not show any numbers on this file although it did for two seconds at Zero road speed in another file, 10 and 18 readings
    3. Temp was increasing but it was being tested going up a steep road repeatedly, wondering if that's because no EGR cycling?



    • I have checked for oil on the ECU plug, it's clean.
    • New MAF and Turbo modulator and lines renewed.
    • Waste gate serviced
    • Have tried changing the length of turbo actuator arm, test file done with 16 threads showing, I wound it back in case it was an overboost, but didn't make much difference. 14 thread test was similar. Last service by agent it came back with 12 threads!
    • Not seen any overboost errors logged.
    • Fuel pump failed three years ago and was replaced with new one by LR agent, as was the fuel filter.
    • Test for attached file done not towing to see if could replicate it that way, it did, but notice the results less as drive around below the level it goes to zero.
    • It was overboosting and surging before the modulator was replaced, it does not do that now.


    I can problem solve usually, even discovered why I couldn't post here for the last few days!

    "Driver Demand Problem 1" Still appearing but not immediately, has to be driven for a bit. No other errors.

    Any ideas on what I could look at next would be appreciated.
    What year is the car? I.E. do you know if it is EU2 or EU3?

    Anyways, I'm taking an educated guess it's EU3 because of what's happening, if so I think you need a new MAP sensor.

    No guarantee but I think that should fix all the problems reported if it is EU3.

    Cheers
    James

  9. #19
    discorevy is offline ChatterBox Silver Subscriber
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    It is Overboosting, just mightn't be logging a fault.

    Bypass the boost modulator (Run line from turbo outlet pipe straight to actuator) and take it for another run, this will tell you if the wastegate is sticking if it still faults.

    Attach another file

    It shouldn't fault with 16 threads showing and it will probably feel doughy when driving like this .


    Looking at the AAP, it seems there would also be a bit of excessive restriction, even allowing for altitude, maybe a blocked filter but this is a separate issue.

    Edit: James beat me to it again, but doing the bypass can also help point to faulty map
    Edit 2: just had another look at the file, agree with James, map sensor most likely, they can fault in many ways and are all around 20 years old and over.

  10. #20
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    Quote Originally Posted by discorevy View Post
    It is Overboosting, just mightn't be logging a fault.

    Bypass the boost modulator (Run line from turbo outlet pipe straight to actuator) and take it for another run, this will tell you if the wastegate is sticking if it still faults.

    Attach another file

    It shouldn't fault with 16 threads showing and it will probably feel doughy when driving like this .


    Looking at the AAP, it seems there would also be a bit of excessive restriction, even allowing for altitude, maybe a blocked filter but this is a separate issue.

    Edit: James beat me to it again, but doing the bypass can also help point to faulty map
    Edit 2: just had another look at the file, agree with James, map sensor most likely, they can fault in many ways and are all around 20 years old and over.
    Yeah ok. Will do the bypass and record.

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