How old are the glow plugs? The GP system should only take one cycle and then fire, unless you have one or more bad GP's or then something else. Start with the GP's first.

FastLane sells two German GP's that will work for your car, Beru or Bosch.

I used to cycle my Ford diesel F-250 truck 2-3 times, until I got smart and replaced all the GP's with OEM Beru, now it fires right up everytime.

Good luck,

Hugh

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1985 300TD 190k

1991 F-250 7.3L diesel 150K