The 4.3-liter, V-6 Vortec engine that Chevrolet produced for their 1994 Blazer used the classic distributor-type ignition system to control ignition timing. The distributor is oriented with the No. 1 cylinder spark plug wire terminal pointed toward the front of the vehicle, and the rotor button within the distributor turns in a clockwise direction. Cylinders are numbered front to back, with odd numbers on the driver side, and even numbers on the passenger side, making the No. 1 cylinder the one on the front, driver-side corner of the engine. The firing order is 1-6-5-4-3-2.
When Replacing Wires
A common practice used to avoid cross-wiring the engine during ignition system maintenance is to disconnect only one spark plug wire at a time while you work. If that is not practicable, then make labels for the wires before disconnecting them. Because of their differing relative positions to the distributor, each spark plug wire will have its own unique length. If you remove all of the wires without labeling them first, a good rule of thumb is the wire to each cylinder should be the shortest one that would fit.