HELP!!!! I have a 1995 s-10 blazer that cranks no injector pulse. the system used for this year has the VCM OBDII system. I got this after a chevy dealer could not figure it out. they installed a new VCM, crank sensor, distributor cam sensor, and crank sensor. The truck will run on carb clean but has no injector pulse. Alldata is very unclear on how the vcm toggles the ground. Any ideas?