Hard to start

[LizaDave]

Hello,

Shortly after fueling up the 940, the car started slightly mis firing, once I stopped it and tried to restart it was very difficult to get running.
It would crank and not fire, but once the key was released from crank to just ignition on the engine would start firing and eventually if trying to start often enough it would start and run OK,
I have replaced the knock sensor but that made no change,
I found several leaks on the inlet manifold and cured them, but no change
I am getting spark to all spark plugs, but the timing appears to be 10 degrees retarded for some reason.
Any Ideas to help?

 

[Shaggy]

once the key was released from crank to just ignition on the engine would start firing

That exact symptom is a classic worn ignition switch on the 700/900 cars. The electrical part behind the lock loses the ignition and fuel pump feed in the start position, then comes back when you release the key. The switch is cheap and replaceable without touching the key cylinder. I'd also check the fuel pump relay while you're in there.