200 HPDI only runs on 4 cylinders in gear

[Tempus Fugit]

I have a problem with one of my 200 HPDI motors. The motor only runs on 4 cylinders both in neutral and in gear.

The obvious thing is the neutral safety switch, but it is working correctly, or least as far as YDS is concerned. It shows ON when in neutral and OFF when in gear. Cylinders 2 and 3 show as off in neutral and in gear, and it is definitely only running on 4 cylinders.

Any ideas on what this could be or where I should look?

Thanks

[Tempus Fugit]

Hmmm, it is now running on 6 cylinders just fine, but I didn't do anything. I understand that there is a second switch, shift interrupt switch, maybe to the control assembly?

I tried to start it in gear to see if this switch was faulty, and it wouldn't start. I then put it in neutral and it started fine and started running on 6 cylinders when in gear.

It's running fine now, but I'd like to resolve this issue.

Thanks.