How do you fix a Geo Metro seized motor?

To fix a seized motor in a Geo Metro, first, attempt to free it by removing the spark plugs and pouring a penetrating oil (like WD-40 or PB Blaster) into the cylinders. Let it sit for several hours or overnight to allow the oil to penetrate and lubricate the internals. Then, try to gently rotate the crankshaft using a wrench on the crank pulley; if it doesn’t budge, further disassembly may be necessary to inspect for internal damage. If the motor is severely damaged, a rebuild or replacement may be required.