Originally Posted by
gcfcos
I've set the co up on the gas analyser at work to what msd told me to, (from memory I think it was 2.5%) but it was a while ago and I could be wrong. It was very hard to set the co up accurately with it hunting but I'm thinking of taking the car back Into work and setting the idle up with the iscv unplugged so the idle is stable and then set the co up while its idling stably and then plug the iscv back in and see what happens? Failing that I'll save up and get it booked into a rolling road but wanna try and fix it myself first. Thanks again for help
If it idles ok and stable with the valve unplugged, that would indicate the mapping is suitable, 2.5% co is fine and pretty much all ybs will idle steady there.
If so check the tps cal, and then strip the valve and inspect the spring tension under the piston. Make sure it's rebuilt properly. I see loads of valves badly built up causing idle problems and making the valve constantly pass air.
It could still mean the load sites around idle that you reference as the manifold depression changes when the Iscv operates need a bit of work.