Gents, 2000 D2 with 54000 miles
Here's a short story: Last winter, as I was experiencing MPG that I thought was only possible with an 18 wheeler ( 9-10 m.p.g), I decided to change my spark plugs as one of the many steps to try and improve m.p.g.
I looked up the Champion web site and they have 3 classes of recommended plugs for the Disco.
Premium: Double platinum, premium gold and Iridium
Super : single platinum and truck plug
Regular: Traditional spark plug
anyways....
I went with the Premium gold, which is the cheapest of the premium class. Per the Champion web site, they are supposedly gapped to factory specs to 0.32 ???? I know that Land Rover recommends between 0.38 and 0.41. So I regapped the plugs to 0.41 to be within that range. And although the Disco was Idling very smoothly( but lower r.p.m than before at around 600 r.p.m compared to 700 before.), I was questionning the fact that maybe the plugs were designed to be gapped at the 0.32 that Champion claimed was the stock setting for the Disco....And also thought that since these plugs are not the pin needle electrode type, but the same type as any regular plug like the truck plug, this would reinforce my thoughts of these plugs needing to be gapped lower than 0.41.
So...I was relaxing in my garage the other day ,looking for something to do and decided to re-gap the plugs to 0.38 ( to be at the lowest recommended gap by LR). I noticed that although the plugs had only been in for a couple of weeks, the ground was already covered in flat black sooth. Anyways,The Truck was Idling smoothly at the same r.p.m as when at 0.41 (so no change there) but I noticed that my M.P.G which had improved from 9-10 m.p.g to 12-13 m.p.g seems to have gone down again.
And Finally the question....... I'm under the understanding that the bigger the spark plug gap that the ignition is powerfull enough to jump, the better the fuel is burned and the better the engine runs all around, producing better m.p.g. Am I right or wrong, and second, what gap do you run on your plugs???and third, what plugs do you run???
I will sometime soon, change the wires, but my question now is regarding the plug gapping.
Thanks,
Steph
Here's a short story: Last winter, as I was experiencing MPG that I thought was only possible with an 18 wheeler ( 9-10 m.p.g), I decided to change my spark plugs as one of the many steps to try and improve m.p.g.
I looked up the Champion web site and they have 3 classes of recommended plugs for the Disco.
Premium: Double platinum, premium gold and Iridium
Super : single platinum and truck plug
Regular: Traditional spark plug
anyways....
I went with the Premium gold, which is the cheapest of the premium class. Per the Champion web site, they are supposedly gapped to factory specs to 0.32 ???? I know that Land Rover recommends between 0.38 and 0.41. So I regapped the plugs to 0.41 to be within that range. And although the Disco was Idling very smoothly( but lower r.p.m than before at around 600 r.p.m compared to 700 before.), I was questionning the fact that maybe the plugs were designed to be gapped at the 0.32 that Champion claimed was the stock setting for the Disco....And also thought that since these plugs are not the pin needle electrode type, but the same type as any regular plug like the truck plug, this would reinforce my thoughts of these plugs needing to be gapped lower than 0.41.
So...I was relaxing in my garage the other day ,looking for something to do and decided to re-gap the plugs to 0.38 ( to be at the lowest recommended gap by LR). I noticed that although the plugs had only been in for a couple of weeks, the ground was already covered in flat black sooth. Anyways,The Truck was Idling smoothly at the same r.p.m as when at 0.41 (so no change there) but I noticed that my M.P.G which had improved from 9-10 m.p.g to 12-13 m.p.g seems to have gone down again.
And Finally the question....... I'm under the understanding that the bigger the spark plug gap that the ignition is powerfull enough to jump, the better the fuel is burned and the better the engine runs all around, producing better m.p.g. Am I right or wrong, and second, what gap do you run on your plugs???and third, what plugs do you run???
I will sometime soon, change the wires, but my question now is regarding the plug gapping.
Thanks,
Steph
I've only had this truck for about 6 months... but it was running rather well with that gap. I changed the plugs due to regular maintenence. Out of the box, the new plugs were gapped at .41 - truck runs great. 
