OK yes the coolent sensor ..should be 1.3- to 3.6 cold....this controls the pressure actuator....are you able to start and hold the RPMs to say 2000....then get someone to plug in actuator...i feel you may see the engine run very very rich..stink in the exhaust..ok try this..i feel the actuator may have seen full 12v at some point...this will damage it...has the actuator been replaced..any history there..works on the "By - metal princible.......you said you had a new metering unit ??...was the actuator new ?............lets remember also....the actuator must see a good temp sensor....so may be wait till you have sensor....keen to know if it goes into full rich mixture when pluged in....Peter..........also make sure Black ECU HAS POWER....ie....ignition on Pin 1....live 12v.....Pin 2 earth negative....you will see 1 long row of terminals....one short row....its the long row you need...both 1 & 2 up one end......sorry i keep editing...thinking ECU could be dead