Ok heres somthing new and exciting that my disco hasnt done before!

I pulled up at a set of traffic lights yesterday and the old motor was missfireing on one pot! In a state of panic at the impending garage bill i headed home to see what the damage was. Pulled up outside the house turned it off decided to restart it in case i had just imagined it and the missfire was gone! i have used it this morning with no problems at all!

Any ideas?

No white smoke during the missfire! no water in the fuel! i checked it see!

Take the lid off the battery cover, look down at the ECU, and admire all the oil in there, then order and engine harness inside the head.
You will need to clean the oil out of the under bonnet loom, brake cleaner did mine well.

Rob

Thanks for the reply no oil in there everything looks dry! quess i got the good one eh!?

discoade said:

Ok heres somthing new and exciting that my disco hasnt done before!

I pulled up at a set of traffic lights yesterday and the old motor was missfireing on one pot! In a state of panic at the impending garage bill i headed home to see what the damage was. Pulled up outside the house turned it off decided to restart it in case i had just imagined it and the missfire was gone! i have used it this morning with no problems at all!

Any ideas?

No white smoke during the missfire! no water in the fuel! i checked it see!

Click to expand...

This is the classic injector loom problem. If you went to a dealer or someone with diagnostic tools it would show an injector fault.

I had exactly the same problem and it was the injector loom - £32-£40 to replace and solved the problem completely. On testing the faulty loom with a multimeter I had a broken wire to injector 1 - the one nearest the front. The symptoms were exactly as you describe - works fine, suddenly drops to 4 and won't go back to 5 until you switch off and on again. It's the ECU appearing to think an injector is faulty and disabling it.

If, when you unplug the loom, there is oil in the plug under the rocker cover then a replacement injector loom is definately on the cards. The newer ones have better seals and so keep the oil out much better. A blast with electrical contact cleaner will sort it temporarily, but it is only a temporary fix - it will reappear!

The injector loom is a doddle to replace, just 13 bolts holding the rocker cover on, unplug the loom from the injectors and then just replace everything with the new loom. In theory you should also fit a new rocker gasket, but it's not essential at all. Mine has been fine.

--
Dave

Ahh Ill take a look at that! Sounds like the problem!

Thanks Dave And Rob

You can follow the links I posted in http://www.landyzone.co.uk/lz/f8/discoii-td5-low-range-problem-44343.html if you want to find out more about "oil in the loom" problem, including pictures. If that forum in Luxembourg doesn't work try a bit later, it goes down sometimes.

Well Done Nosnibod!
Super description.

CharlesY

Hi everyone, I'm new here but have joined in search of some answers.
My TD5 disco has indeed become a TD4, had the rocker cover off and fitted a new loom as described in previous threads here. Still missing on a cylinder. The old loom did have the oil in the end which was cleaned out before fitting of new one. ECU appears clean.
Any idea's anyone? How easy is it to determine if an injector is duff without a computer? Can you run it with cover off and disconnect each injector wire in turn to find the one that doesn't make a difference? (just like you would spark plug leads on a petrol engine)
How easy is it to pull the injectors? Is there any clearances that need to be set when putting back in? Heard a rumour that the copper washer could be at fault? true/false?

I'm a bit lost with this one. Mechanical I can do, electronics..... well that's a different thing.

T reg, disco TD5 with 100,000 miles just. Been a great bus up until now.

Hi Stevio,

Don't run the TD5 with the Cam-Cover off. I did, and soon found out just how good the camshaft lubrication is, my little lad and I were covered in oil, and as for the engine and engine bay, well they certainly won't go rusty now.

I removed the fuel injectors with Heel-Bars (my set of 4 came from Machine Mart @ £18). The small heel-bar lifted the injectors initially, allowing the second size heel-bar to fit under, and completely lift them gently out of the cylinder head.

My particular problem was diesel fuel getting into the engine oil. Due to all the great help and support from Land Rover Forums, I replaced the 5 O-Rings and Copper Washers, and it seems to have sorted it out.