well, i drove home on wednesday. parked up. this morning took the drivers side front wheel off, took alternator belt off, took cambelt cover off ( to see if cambelt is any good), put alternator belt back on, tried to start, but dashboard lights not on, battery completely flat. replaced battery tried to start and fires once or twice and nothing. sparkplugs dry. spark ok. so must be a fuel. how to check if fuel pump is working?
In that case I would put money on it being the crank sensor.
One way of checking it is to unplug the connector and check the resistance between the 2 pins. The connector is located on the back of the inlet manifold sort of in the middle and is brown.
The resistance should be under 1000 ohms, much more than that and it is goosed.
It is still possible to get a good reading from a knackered sensor though, but if you get a high reading it is certainly knackered.
Changing it isn't too difficult. The sensor is screwed into the engine block by an M6 allen head bolt, just below the starter motor. The easiest way to change it is to remove the throttle body and get at it from the top. You can follow the wire down from the top to find its location.
Disconnect a fuel injector multi plug and see if a pluse is produced through a test lamp (any low current 12volt bulb will do). No pulse/flashing= injectors not opening which as already mentioned is most likely to be the CPS.
will have to try bulb trick, sounds easier than getting cps out. Does any one knows is there a workshop manual for alfas? i used to had one for all cars up to date on a cd, but i've lost it. it had everything in it. fault code how to's, wiring diagrams and everything you need if you own a garage. even repair times. just i cant remember were i got it from.
brown plug was 850 ohms, injector were showing abou 8 volts constant. what are those 2 white metal pipes coming from underneath the car? fuel pipes? one goes in to inectors, the other goes somewere inside drivers side wing and one comes out, the one from wing goes in to engine under throttle body? when turning ignition key on, from which one shoud petrol come out???