Discovery TD5 auto problem

fuel filter/fuel pump/lift pump/air filter

you have fuel starvation which shows up at high revs, or maybe air starvation

when there is no load against the engine it takes nothing for it to get to high revs, however when its under load,this puts significant demand on the fuel and air supply systems..

its definatly worth ruling out

Sounds like a fuel pump problem - I had a fuse go on the feed to the pump in my 90 and this caused exactly the same symptoms you've described.

Definitely worth checking the fuel pump fuses, relays and the pump itself - it's not totally unknown for them to die.

Martin

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Ther is no fault saved in the ecu only in the gearbox, which is obvious, surely if a fuse was blown then the T4 would pick it up, you can hear the pump when you switch ign on. Had the idea that maybe the pump doesn´t make the required pressure anymore (4 bar) What do you think?? and to test the pump using T4 you need a different adaptor cable(which I dont have:-( )

Lobby

That would sound about right, although the pump is running there isn't sufficient pressure. However off the top of my head I can't think of a way to check the outlet pressure of the pump in situ without using a pressure gauge (obviously).

One thing to check is the voltage being supplied to the pump. When mine went the fuse was acting as a resistor and leaving only approx 6V for the pump - so it was running but not at full pressure. Might be worth checking the pump is getting 12V.

Martin

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The injector loom leaking is a known issue by LR and you could have got this replaced FOC, I just have on my '99 Disco with 71000 on the clock

Mark

You could alway try checking the amount of fuel pumped into a suitable large container over a period of time. It should do nearly 1 litre in 30secs.