Where is the electronic spark control module on a 93 Chevy 4.3 s10 blazer?

The Electronic Spark Control (ESC) module on a 1993 Chevy 4.3L S10 Blazer is not a separate, easily identifiable module like some other components. The function of the ESC is integrated into the Powertrain Control Module (PCM), also known as the Engine Control Module (ECM).

Therefore, you won't find a separate "ESC module." The PCM is usually located under the dash, or sometimes under the hood near the firewall, depending on the specific trim and options of your Blazer. It's usually a fairly large, rectangular black box with various connectors. You'll need to consult a wiring diagram or a repair manual specific to your 1993 Chevy S10 Blazer 4.3L to pinpoint its exact location.