cool thanks for your time, i program modern ECUs so no daft to them but more laptop tune that pre set chips and resistance. Right so the black box in sense is working as i guess cold when i first unplugged it and warmer afterwards so in a sence the black box only works when the engine coolant is below the 50 c. I thought the yellow coolant kept working, is that just to provide a earth relay switch to power the black box to re enable the enrichment i guess from the ECU