Assuming your plugs were wet with unburnt fuel, 'Triple-S', petrol is presumably being injected when cranking the motor. I've had plugs that have seemed fine when flashed against the head, but which refused to fire under load. It would indeed be unusual for all six to simultaneously exhibit this fault, however. Do you have a known spare set that you could substitute. I've never had dealings with a 164E, but recall that my 145E was very sensitive to plugs and only ever really liked Bosch.
I must admit that the sudden onset of the problem is more indicative of a sudden component failure, and can only suggest that you once again systematically check through the fuel and electric systems in a bid to identify the culprit. I am sorry that I cannot be more helpful.
Regards, John.
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