If you remove the jumper from the box completely but leave the box connected up does the car run on the OEM fuel map?

Im not sure about that but i do know if you remove the inline blade fuse the car goes back to oem

Oh right the one on the battery loom? Cool cheers.

Yup, thats it

The fuse in the wiring loom

Funnily enough i think mine has blown today

The turbo isnt kicking in as fast as normal and there has been a decrease in smoke

I need to get some new fuses before i start fiddling about with it though

check the light inside.. should be green.

if you remove the jumpers on the 16 position box , it is set to full power

i.e. loads of fuel = loads of smoke

I have the newer 7 position box.

check the light inside.. should be green.

I had a look at the fuse today and its fine

I will have to try running with and without the fuse

If the box has gone kaput i might as well look into a re map