dead 166

[Catchpole]

Well, not quite dead but certainly not v well. Would be grateful if anyone has any bright ideas as my mechanic has run out of them. 166 2.5 with 80,000 miles, developed an occasional miss on long trip one weekend. Got worse & 2 days later it cut out completely. Would start after a while and run for a few minutes before cutting out again. Home courtresy of the RAC.... Garage says that computer shows no faults now that they've changed a flywheel sensor, but there is no spark at the plug when the starter motor is spinning. Fuel pump is apparently fine. Help!

[Alfa Mad]

I would check to see if the injectors recieve a pulse signal. As both the ignition and injectors recieve a signal from the ECU, I'd check to see if it is a linked fault, or simply affects the ignition side.

Anymore info than that would possibly not be helpful until it is known in what area the fault lies.

Hope it goes well...

[Catchpole]

It seems that there's nothing going to either the injectors OR the plugs. They are currently investigating the immobiliser but no joy yet......

[rassi]

Have had a similar problem on my MB C43 (yes, I know ) and it turned out to be a crankshaft (or was it camshaft?) sensor that was heat sensitive and gradually got worse and eventually completely failed. Computer showed no faults, and only when diagnosing it with the computer hooked with the engine idling until it cut out was the problem found.

[Alfa Mad]

If the fuel pump is inoperative, it could be an ECU/immobiliser related fault. Does the injector rail recieve fuel delivery?

[wowbagger t.i.p]

I had a similar problem on my 155 2.5 V6, it turned out to be the crankshaft position sensor. My local Alfa specialist diagnosed it over the phone, supposidly it is a common problem with the 2.5 v6.