Hi guys still having the same problem getting my mk2 astra LET to start got rid of code 144 (immobilizer) by changing to an earlier ecu. This is doing my head in!!! So the car turns over ok but doesnt fire there are now no fault codes, all 4 plugs get a spark, the fuel pump is working(checked), the fuel pump relay works(checked), the fuel lines are on the right way round, it gets fuel to the rail and to the cylinders (new plugs are black from unburnt fuel), replaced gearbox earth strap. Has anyone been here before? Anyone got any ideas? Would the crank position sensor stop the engine from firing if it was faulty? If so would it not either cut fuel or spark? If you get both it should start and run ok? Also replaced plugs, dizzy, dizzy cap , rotor arm and battery. PLEASE HELP!