Where is the electronic spark control located on 93 full size blazer?

The electronic spark control on a 1993 full-size Chevrolet Blazer isn't a single, easily identifiable component like a distributor in older vehicles. Instead, the spark timing is controlled by the Powertrain Control Module (PCM), also known as the Engine Control Module (ECM). This is the main computer for the engine.

You won't find a "spark control" unit; the PCM manages spark advance through various sensors and actuators. The PCM itself is usually located under the dashboard, or sometimes under the hood, but its exact location within a 1993 Blazer will depend on the specific trim and options. You'll need to consult a repair manual specific to that year and model Blazer to locate it precisely. It's usually a fairly large, rectangular box with many connectors.

Keep in mind working directly with the PCM requires advanced mechanical and electrical knowledge. Incorrectly modifying or manipulating the PCM can cause serious engine damage.