When your Glow Plug Light goes out keep the Key in that position for and additional 20 seconds or until you here a click under the hood and Start the Engine.

If it nails less you have something going on concerning the burning of the Fuel in the Combustion Chamber.

If you have not done it already I would look at the pictorial on the Diesel Giant site on checking the Glow Plugs. It will take longer to look through the pictoral than the time it takes to check the Glow Plugs.

Also, when the page at the site opens up it appears that there is not much there; you have to scroll down the page to see more.

If the Glow Plugs seem to be OK. Other causes of Nailing are Fuel Injection Pump Timing, Injectors with worn Nozzles and/or low opening pressures, and low Compression (could be due to Valves not being adjusted as well as wear on the Engine).

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84 300D, 82 Volvo 244Gl Diesel