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Land Rover Repair/Discovery TD5 Misfire


TAG wrote at 2006-10-06 18:06:03
Ihave a 2003 TD5 and it has just developed a so called injector fault,After having my disco checked on a LR diagnostic monitor I have been told that the most likesly fault is with oil contamination in the loom.Suggest you try changing this as it only cots around 35.00 as apposed to around 400.00 per injector!!!

good luck !!!


Dive Tramp wrote at 2007-08-15 18:09:48
My TD5 misfire was cured today by cleaning (removing )all traces of oil that had collected in the ecm/injector sensor wires connector block found just under the "rocker " cover. Looking at the engine, from the right wheel arch its under the right handside front of the cylinder head. Its a conn block with tiny pin type connectors whose wires run back into the rocker cover.

SamuraiSi wrote at 2008-01-17 17:48:33
I would look at the red plug going into the ecu. If it has oil in it, it makes the motor missfire. Oil creeps down from the cam via the injector loom which is located at the front left corner of the cam cover (upside down)and by an act of god ends up inside the ecu plug (Red). Just unplug the loom at both ends and clean.A known LR fault.A replacement loom is about 40.Plug the engine side of the loom to prevent more oil creeping down.Oil inside plastic will continue to creep to the ECU for aprox 3 weeks so keep an eye on it. Hopes this helps

SamuraiSI wrote at 2008-01-17 17:55:49
The injectors allow a high pressure of fuel to pass.The period of time the fuel flows (quantity)is dependant on the length of time the ECU submits a signal.. The wiring loom links the two together.

andyc wrote at 2008-06-06 21:39:32
It's probably going to be the injector harness. It runs fine to start with and when engine heats it changes resistance. THe oil around the wiring changes the resistance and cause sthe misfire. If you disconnect the plug from the loom to the ecu it will probably have oil inside. Landrover replace loom and harness, I just changed harness and it did the job a treat. It's best to start with this. THey ar 45 from Landrover, but can get them a few quid cheaper on ebay etc. Fits in around 1-2 hours tops

aussie mick. wrote at 2014-02-05 08:54:29
my td5 misfired 2300 rpm  spent heaps of money  to no avail      . i was driving to slow. give it a boot full. after a while it started to go good . in other words  rev it harder through the gears. i think it must reset the computer .

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John McInnis


Land Rover Discovery. I've had most of the common mechanical failures, altenator, water leaks, wiper failure, door/hinge problems, roof rust, floor rust, loads of electrical problems. Remember, I'm not a dealer or a mechanic, just an owner like most of you.


Owner of a Discovery. I've had many mishaps with our Disco but I still like this vehicle. Talk to a fellow LR owner instead of a dealership rep. I'm not in this for the money. I'm just an owner who wants to help others.

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