My dad had a 91 disco V8 (3.5L). It became quite difficult to start after sitting for a week. You could wind and wind it over nothing, let go of the key and it would fire. Once it actually ran about 2 turns backwards after letting go of the key. Replaced the battery and it was started first turn. Anyway my point is not that it wasn't turning fast enough but that the voltage was dropping low enough that the computer would turn off. (about 10V). As soon as we stopped cranking voltage comes up and away it would go.
Perhaps something similar is happening here.
Wind it over computer is off no fuel goes in. When you let go of the key computer manages to put a couple of squirts in.
The second time you try and crank the fuel is there it lights up you let go off the key and away it goes.
Just a wild theory but who knows.
WR.
84' 120" ute - 3.9 isuzu.
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