This is a common ignition problem. Use a DIY test button push start. I would guess that your key ignition is broken like mine. Currently my Z will start with no key and run and drive. I remove the battery cable when parked.
Below it sounds like he has no prior knowledge of the Z cars.
Have you checked the motor isn't seized? Can you turn it over by hand at the pulley?
you may have water in the cyender, remove all spark plugs then turn over engine, you probably have blown head gasket
The single click, that you hear when the starter switch is operated, is the solenoid making the high tension connection to the starter motor. If the starter motor doesn't turn over, you will need to check both the battery feed to the solenoid and the feed from the solenoid to the starter motor (this is typically a short length of braided cable). I have known this cable to corrode through. If it has, the easiest remedy, is to replace the entire starter motor.
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Problems that can occur with the hand fitting activities?