There's one spark plug mounted on the exhaust manifold. You have to remove it, usually with a hammer and screwdriver. The just thread a new one in.
#1 is about 2 to 3 O'clock firing counter clockwise 1342.
The 1995 Geo Metro spark plug torque specification is 20 pounds. You should torque the spark plug intent pound intervals.
If you have no spark, you would likely have a problem with the magnito (ignition).
My 92 model Geo spark Plug gap is 0.39 thousands of an inch. One Liter 3cyl/5sp. Plug is a ngk BPR6ES-11 Hope this helps
Ignition Control Module.
The spark plug gap for a 1995 Geo Prism Isi 1.6 liter should be set at .032 inches. A spark plug for this vehicle will be preset at the factory and should not need further adjusting.
.43 gap
place a screwdriver inside the spark plug boot and close to, but not touching, a ground. have someone crank the vehicle as u look for the spark. Best to do it at nighttime when its dark...its also a good way to find plug leaks. they also sell an inexpensive tester at the parts store that will do this also
Check the ignition circuit in the Storm. Start by checking the crank position sensor, then the coil pack to find the lack of spark.
0.028 geo tracker 1990, 8 valves 2 doors
The correct gap is .44
.41 is the gap specified by the Haynes manual for the 1990 Geo Prizm.