If you are talking about the ignition lock cylinder, the steering wheel must be removed and the column disassembled to access a lock screw which holds the ignition lock cylinder in the column. No key is required for this (unlike all other vehicle manufactures). If you are talking about the door lock cylinder, the door panel must be removed, and the lock cylinder retaining clip must be removed (again no key is needed, which is the same for all manufacturers). If you are talking about the trunk lock cylinder, it is easily accessible from inside the trunk. Those are the only types of lock cylinders in this type of vehicle. There is no specific lock cylinder named key lock cylinder.
16.5 to 17.1 gal
You have to take the door apart
its behind the coil packs on the back of block
1991 Corsica its under the trottle body
For a 1991 Chevrolet Corsica : My Chilton's Auto Repair Manual shows : ( 15.6 U.S. gallons )
It doesn't have one, it is distributorless.
Remove the wiring harness from the back of your 1991 Chevy Corsica turn signal. Remove the turn signal retaining bolts. The entire turn signal will come out. Reverse the process to install the new turn signal.
13.6 gallons
Green coolant (prestone, etc)
Depends on which engine it has. Try a Google Search.
The idle air control valve is located on the throttle body, and the EGR valve is located on the intake manifold.
Sure, You will have to change everything,motor mounts,computer,wire harness, exhaust, etc...