In the last 3 days, the 240D has started giving me a flashing GP indicator before I engage the starter.

If I turn the key back to off and back on a few times, it (so far) has eventually gone through a normal cycle and started.

GP's were changed about 10 months ago and work great when the cycle is successful.

I seem to remember reading a post that indicated that flashing before the crank was a different problem than the more common flash after crank (which is an open plug). But in reading quite a few threads, I am finding more info on flashing after crank, or no light at all.

What does a flash before crank mean, and how should I best diagnose it since it is an inconsistent problem?

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT

Not sure, but you may want to visually inspect the glow plugs, or at least put an ohm meter on 'em.

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83 SD

84 CD

2nd on checking th Glow Plugs. Even if they were put in 10 months ago the could still be having a problem.

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84 300D, 82 Volvo 244Gl Diesel