The location of the #1 spark plug on a 1986 Chevy Blazer S-10 2.8L 4x4 is on the
passenger side of the engine, towards the
front. However, "front" and "passenger side" can be subjective depending on your viewing angle. To be sure, you'll need a repair manual specific to your year and engine. The manual will have a diagram showing the firing order and the location of each cylinder.
Without a diagram, trying to locate it solely on verbal description increases the risk of misidentification. Using the incorrect plug could damage your engine. Consult a repair manual before attempting this.
