Check the Glow Plugs with an Ohm Meter (don't recommend buying Parts there) go to the Diesel Giant Site under Glow Plug Repair and there is a pictorial on how to check with the Ohm Meter.

Check the Strip Fuse on the Glow Plug Relay for a crack; the crack can be hard to see (this happend to me). Check the Screws that hold it down to see if they are loose.

The Engine will start with one bad Glow Plug. After it starts does it sould like there is one Injector that is more noisy?

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84 300D, 82 Volvo 244Gl Diesel