I'm revisiting this thread as I still have a tickover problem, although slightly different.. The tickover became more erratic and on the F&C run it continually cut out at junctions/light etc (it would die as soon as revs settled at about 1,100rpm). It started fine following each cut out but wouldn't tick over. The cutting out was solved with a change of lambda sensor but now the tickover settles at anything up to 2,000rpm. I'll pull up at lights for example, and it'll be revving away. At cold and until run for 30mins or so it ticks over fine and settled at about 1,000rpm. It has a locked Caterham ECU. Do I: a) Download Easymap, buy a cable and try to identify the issue? (I'd learn a bit about the car more but may not actually be able to fix the problem, or b) Get it back to Caterham who 'should' be able to fix it, or c) take it elsewhere? (where? I'm in Hertfordshire) Cheers.