Hi everyone. My lovely Jag developed a misfire today on the way to work. It seems to happen when I'm going uphill (so under load) but not necessarily when I simply accelerate. Any ideas where to start looking?

cheers

Tim

Hi Tim

Could be one of many thing really, Have you checked for any fault codes?

If I were mine, I'd start with a new set of spark plugs, but also it could be a coil pack

if you change the plugs, they should be a nice light brown/tan color, if you get one plug that's black/sooty that could be the problem one

if plugs don't cure it and you are getting a odd colored plug compared to the others, swap the coil pack with another cylinder and take it for a run and see if the dirty plug shifts to the new position

also check the coil pack connectors for corrosion, this can also cause this

cheers

Joe

Cheers Joe, I'll have a look at the plugs. Failing that, I'll get it plugged in. 

Thanks a lot

tim

Just out of interest, could the misfire be related to the sudden cold snap?

Hi

Could be, bit a damp in the right place, can give you a right nightmare

cheers

Joe