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The shutoff system works on Vacuum.
You are going to need to trouble shoot the System and a Hand Held Vacuum Tester generically know as a Mighty Vac (althoug Mighty Vac makes one) is helpful.
The problem can be caused by low Vacuum (you did not say you where having hard Braking issues).
The low vacuum can be caused buy a Vacuu leak of leaks anywere in your Vacuum System including your door locks and climate control.
What you need to do is disconnect and cap off (the end that supply the Vacuum) the Vacuum lines going through the fire Wall but leave the Brown Vacuum Lines connected.
That removes them from the System.
If you Engine shuts off normal whan that is done you have a leak in the Climate or your Locking System or if you have one the adjustable Seat (but you did not complain about these issues).
So we will focus on the Brown Vacuum Lines.
On mine the soild Brown Vacuum Line going through the Fire Wall is the Vacuum Supply line and goes to a Vacuum Switch on the Steering Colum Lock and the brown line with a dark blue (black?) strip goes fromt he Vacuum Switch to the Shutoff Vavle on the Fuel Injection Pump.
Start your Engine and disconnect the Brown Line with the Blue where it attaches to the Vacuum Shutoff Valve on the Fuel Injection Pump.
Connect a separate section of Vacuum Hose to the Vacuum Shutoff Valve on the Fuel Injection Pump and either suck on it or use the Hand Held Vacuum Tester to create Vacuum.
If that shutts off the Engine the Shutoff Valve on the Fuel Injection Pump is still good enough to work. However, if you found Engine Oil in the brown line with a strip the Shutoff Valve has some holes in it as it is leaking Oil.
Reconnect to the Shutoff Valve
Next disconnect the solid brown line going into the fire wall and do the same test with the Key in the off positionn. It should turn your Engine off. If not you have an issue with the other Vacuum Valve located on the Steering Colum or the Vacuum line or the rubber connections.
The pic is of the inside of the Steering Colum Lock and the Plastic Cam that operates the Vacuum Switch on it. I suppose it is possible for something to happen to that Cam but none our Members have had that Happen.
I had the center shaft break off but that effected the Ignition Switch not the Shut off Valve.
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84 300D, 82 Volvo 244Gl Diesel
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