ummmm 5% CO at idle, mine is nearly identical spec to Daves and when that went in for the MOT was running 0.37% at idle .i take it that was far to low, but without any changes now runs 9.5% (who knows why - no rolling road garage understands it) when it gets to about 3000rpm the lamba sensor switches over and fueling is fine on boost, just off boost it seems far to rich !!

Just noticed my chip actually clicks during running, when i rev up it clicks as the revs drop it stops !!!............???