Hello All,

Just wondering if anybody could offer some enlightenment.

I've got a V8 Disco and I like it...! What I don't like is the amount of fuel that its using. I've clocked it at 10 mpg which I'm sure is a bit low even for that beast of an engine. It also hunts for the idle when first started and you can also smell excess fuel. I've made a roverguage cable and cranked up the software (fantastic piece of kit) and the first obvious problem I can see is that both lambda sensors show their readings constantly at -100% in the short term and never swing positive. Is this likely to be a lambda sensor error or are they in fact reading that there is too much fuel in the mixture and the fault is elsewhere. There's also a stag LPG system on there as well but I'm trying to get it to run properly on petrol first.

As you can tell, I don't know much about petrol engines.

Thanks in advance for any help.

Dave.