It will be in the ducting before the throtle body.
In the intake manifold plenium, its a 2 wire sensor
no where
The Throttle Position Sensor is located on the throttle body
yes
The 1989 Honda Civic is not equipped with an EGR valve.
a new oxygen sensor might be needed
probably one located just after the engine on the exhaust. by now this sensor will be stuffed
The spark plug gap for a 1989 Honda Civic LX is .044" (1.11mm).
the fan sensor will be located underneath the distributor it should be a 2 wire plug and the sensor itself should be screwed into the head
I have a 1989 civic dx: door 6.5", rear deck, 6.5"
You can't.
No