I posted the following on uk.d-i-y with some excellent suggestions resulting. I'm going to have to spend some time on the beast when I get a dry day. However it occurs to me there may be someone on this group who can offer some personal experience of the problem. At the moment I am hoping to get to the throttle pot but it looks like a seriously difficult access problem :-(
My '03 Discovery has begun a sporadic fault. Symptom being the engine management fault light comes on and the accelerator pedal has no effect
although the engine continues to run at tick over. This has happened twice now at about two weeks apart. First time just before Christmas on
a busy dual carriageway during peak period. I managed to coast up onto the grass right out of the way of the traffic fortunately or some loon would no doubt have come to a sudden stop in my rear end. I called the RAC out and on arrival the fault had disappeared. the engine started and ran ok so we travelled to a nearby car park where the RAC guy plugged his "universal" comms laptop into the link but the Land Rover system would not talk to his set. He theorised that the fault was transient but would be in the engine management memory and a Land Rover agency could interrogate it. Having tried and failed to make an appointment at a reasonable time before Christmas the problem recurred on boxing day but I found simply turning off then on again was sufficient to reset the unit again. I am now due to take the vehicle into an agency next week but they were not confident the memory would still hold the fault. Have we anyone in our numbers who have knowledge of the engine management system on a Discovery 2.5 Diesel and is it feasible to get hold of the commes interrogation software to run on my own laptop?