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Firstly I'd check the wiring to the main engine control relay.They are renouned for corroded wires and this cuts the power to all the engine sensors and glow plugs.
The relay is situated in a box on the nearside of the engine bay.My info says that it's relay number 2,but this could vary.Check for corroded connections or wires.Any signs of 'greening' and that will be where the fault is.Try and pull the wires and see if they break.It is common for the wire to look fine,but inside it's corroded and broken,if you pull them the insulation breaks and you'll see the wire is damaged inside.
You can try running a 12 volt wire to the stop solenoid and seeing if the engine will then start.If it does start the engine will be in limp mode,but if this will be another sign that the relay or the wiring is at fault.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo
Last edited by Lagdti; 6th February 2008 at 09:10 PM.