The firing order for a 1990 Chevy S10 Blazer's engine depends on which engine it has. There were several engine options available that year. You
must know the engine displacement (e.g., 2.5L, 4.3L) to determine the correct firing order.
Once you know the engine size, you can find the firing order in your owner's manual or online through a reliable automotive repair resource like a Haynes or Chilton manual for your specific year and engine.
