Were is spark control module at on 89 Chevy van?

The spark control module (also sometimes called an ignition control module or ICM) on a 1989 Chevy van is typically located on the distributor. However, some models might have it mounted separately, often near the distributor or on the firewall. You'll need to consult a wiring diagram specific to your van's engine (e.g., a 4.3L V6, 5.0L V8, etc.) to be sure. A Chilton's or Haynes repair manual for your year and model van will show you the exact location.