You may end up having to remove the Electrical Connector that goes to the wires that connect the Glow Plugs wires; the largest connector.

Have someone crank the Engine while you carefully spray in Starting Fluid. By having someone else do the cranking you get the best control possible when using the starting fluid.

Unfotunately the fact that it ran good 2 years ago does not reflect what happens to the Diesel Fuel or any contaminants like Water that can be in the Diesel Fuel. It is possible for rust to develop inside of the Injectors and the little nozzle Pintels can get stuck in the upwards positon and the same with the Element Plungers (why you need to verify you are getting fuel to all of the Injectors).

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84 300D, 82 Volvo 244Gl Diesel