How to set time on 94 s10 blazer 4.3 vortex. where is the dist. bypass wire locate.?

The distributor by-pass wire, seems to be the wire that runs from the distributor to the ECM module. Just disconnect it and retime, then plug it back in. If you have checked Top Dead Center on number 1 piston then all you have to do is move the distributor cap by untightening the 9/16's bolt below the distributor housing. This will allow you to rotate the distributor with the cap on to increase or decrease the rpm's at idle. You will need to tighten the bolt holding the distributor metal plate down after Idle is running smooth or the distributor will move when the vehicle is shut off. To remove the wire from the back of the ECM (Electronic Control Module) you will need to remove the distributor cap and two connectors that run to the coil pack from the distributor.