We set the base idle today - without the ISCV plugged in we got it idling nicely at around 900rpm.

We found that the previous owner of the engine had bodged the adjusting screw - with traces of silicone around the top of the threads and tip of the taper. That's now been replaced with new o-ring seals.

Without the ISCV plugged in it sits nicely at 850-900rpm when warmed up. As soon as we plug the ISCV in it rises to around 2000rpm and flicks around a bit.

We can't find any air leaks. One thing we haven't checked yet is the CO - I've just bought a cheap gas meter to do this, but haven't got around to it yet. What should I set and see for a closed loop setup?