I had the same problem with the valve cover gasket and my car starts some days but other days everything lights up but it wont turn over.
Please, your Honda Civic 1991 is a manual shift?
If positive, the car crank and do not start?
If it is positive also, please check your clutch pedal area and see if there is broken parts of a blue plastic peace.
If there isn't go down to the steering wheel area and look the clutch pedal (press it). It needs to take a blue plastic peace like an arrow. This peace it press a switch which cut the start connection. As you know the Honda Civic shift model only can start if you pressing the clutch pedal. That the reason why if have all lights on and the it cranks but do not start. We have to buy the switch and the only place I found it is the Honda Dealer.
Hope this can help you.
Check the alternator
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