morning all,

checked the fuse, ok, power to the heater connetion ok and a new probe fitted,

measuring across pins 1&2 at the ecu, the voltage reads 1.2vdc at idle even when upto temp, the voltage only drops to 0.3vdc when you rev it and it drops on the overrun, im not an expert on this by anymeans, but the point that BMEP made about the head being skimmed seem to make me think that this itself could be the cause.... so could a reduced vac (getting closer to atmospheric) equate in the chips fuel map to intorduce more fuel as it thinks the engine is coming on load,,,

i think,,, the best bet would be to when its mot'd next week(hopefully) is book in at MSD and let stu see it and if needs be have a closed loop MSD chip fitted or have it live mapped, whichever is needed