1990 riviera cranks but won't start on 1990 Buick Riviera

coil pack and ignition module are good still no spark

Asked by for the 1990 Buick Riviera
Check for injector pulse, if no injector pulse then suspect a bad crank sensor, which will also cause a 'no spark' situation. I worked in GM dealership and this was something that I often found to be a problem with these types of cars of this era.