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LPG is the Tartarini system (vapouriser type - not direct injection). Yes, it does misfire on LPG but I think this could be due to the plugs being sooted-up. Unfortunately I can't get hold of a scope so I will try to describe the typical needle movements on the multimeter: (in approximate...

Right, as eightinavee said - time for some proper diagnostic work. I am working with two multimeters - an accurate digital one and a less accurate analogue one. I have checked both oxygen sensors. The readings are similar. When running on petrol the readings are 'all over the place' but...

OK - done that - no difference - worth a try though. Other suggestions welcome. Alan

Hi Everyone Progress (of a sort) at last. The problem seems to be overfueling - took out the plugs today and they were black (sooty). After cleaning them the Disco was pretty good for about 5-6 miles then started misfiring again. I have checked the oxygen sensor (front one) and it seems...

Thanks for the suggestion - is this a common failing? The rotor arm certainly looks OK with no signs of burning or tracking. Alan

Hello what does that mean? all cylinders or at all speeds or what? I mean that it is more than one cylinder misfiring (as far as I can tell). It isn't a regular misfire - it can have run OK for a couple of seconds and then misfire several times in a couple of seconds. Sorry if that is hard...

My 1994 Disco 3.9 (dual fuel) has a misfire, particularly under load. Change down a gear and is seems much better. The misfire occurs on both LPG and petrol, although it is much more noticeable on LPG. The tick-over is slightly lumpy. It feels "across the range" as opposed to a single...