The firing order for a 1989 Chevy Silverado depends entirely on the engine it has. Chevy Silverados in 1989 came with a variety of engines (V6s, small-block V8s, and possibly even a big-block V8 depending on the trim level). You
must know the engine's displacement (e.g., 4.3L, 5.0L, 5.7L, etc.) to determine the correct firing order.
Once you know the engine size, you can find the firing order in a repair manual specific to your Silverado's engine or online through a reliable automotive resource.
