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Disco 2 Loss of power, please help! Auto TD5

Discussion in 'Land Rover Discovery' started by Billy110, Jul 21, 2018.

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  1. Billy110

    Billy110 Member

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    Evening all.

    Just been on the road for 15 hours, should have only taken 9!

    2 hours in, I started noticing the odd flat spot, then it got progressively and significantly worse. Terrible when going up the box or hill climbing.

    Ok in top gear, very limited power in 2nd and 3rd.

    When I got to my destination, it cut out and wouldn’t restart for 15 minutes, then was dog rough so left idling for 15 minutes then it got well enough to start the return leg.

    Awful and almost undriveable. Following long hill climbs, I’d pull over as it was so rough with so little power, and when I pulled over the revs dropped off and it cut out. Wouldn’t restart for 10 minutes. This was the pattern for the next 8 hours.

    I haven’t serviced the gearbox filter. Could the box be slipping, transmitting heat and somehow causing the rough running? Water temp didn’t move at all. The oil cooler wasn’t running excessively when I was pulled over.

    Totally flummoxed.

    I put a tank of expensive Shell unicorn diesel to discount bad fuel.

    Please help!
     
  2. Iancorky

    Iancorky Well-Known Member

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  3. Billy110

    Billy110 Member

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  4. Billy110

    Billy110 Member

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    Have been in with my meter.

    Signal from the MAF, on the MAF plug, showing 0v. Perm live then charging voltage ok.

    When running (albeit badly), I can unplug the MAF and the engine continues to run.

    On the look out for a supplier for a Genuine LR MAF.

    I want to inspect the red ECU plug next but daren’t disconnect the battery as I don’t have the bloody radio code! I’ve put up another thread for this though...
     
  5. johnlad

    johnlad Well-Known Member

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    Can do it without disconnecting battery
     
  6. sierrafery

    sierrafery Well-Known Member

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    Physically it's possible to remove the ECU and unplug it but i strongly discourage you to do that without disconnecting the battery first cos you can ruin the ECU depending on which pins are making contact first... i've seen two cases so it's a risk
     
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  7. Billy110

    Billy110 Member

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    Thanks Sierra,

    I was reluctant, I know electronics don’t like surges or incorrect inputs.
     
  8. Toseland

    Toseland Member

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    one place to look would also be the in tank fuel pump..

    mine packed up and exhibited exactly the same symptoms you described.. sounded like it was running on (for want of a better analogy) three cylinders, coughing and spluttering, white smoke, rough idle the lot..

    new in tank pump sorted it.
     
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  9. Billy110

    Billy110 Member

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    Thanks Toseland, I’ll go through the fuel system if needs be.
     
  10. Billy110

    Billy110 Member

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    MAF ordered, should be here tomorrow.

    Cleaned out the MAP sensor tonight, absolutely filthy.

    Also cleaned out the Temp sensor in the air box with carb cleaner.

    I’ll update if the MAF solves the problem. If not, I’m buying a Nanocom.
     
  11. sierrafery

    sierrafery Well-Known Member

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    You should have bought the nanocom first maybe you could have saved the money on the MAF then ;)
     
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  12. Billy110

    Billy110 Member

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    I don’t disagree Sierra, I need to get one.
     
  13. Billy110

    Billy110 Member

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    Update so far.

    Just replaced the MAF sensor and now getting a voltage back from the sensor, 2.something volts at idle so happy at this stage.

    Unable to test drive it tonight.

    However, sounds a little bit lumpy/flat spot when accelerator initially depressed. Sounds good after the initial press.

    So, I took the plunge and checked the red plug on my ECU without disconnecting the battery (I don’t have the radio code) and did find oil in the plug. None on the ECU pins and nothing inside the ECU housing.

    I’m going to replace the injector harness this weekend. Aside from the harness and rocker cover gasket, is there anything else I need? Does anyone have a description/size of the flexi conduit?
     
  14. brian47

    brian47 Well-Known Member

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  15. Billy110

    Billy110 Member

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  16. brian47

    brian47 Well-Known Member

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    When you cut it to length and put it onto whatever loom you're working on, tape off the ends to prevent them coming apart again. I've found self amalgamating tape tape to be pretty good at the job.
     
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