Here's why:
* Engine Variations: There were multiple engine options available for the 1990 Accord (e.g., 2.0L 4-cylinder, 2.2L 4-cylinder, 2.7L V6). Each engine has a different firing order.
* Safety: Incorrectly installed spark plug wires can damage your engine and could be dangerous.
How to find the correct information:
1. Consult your owner's manual: The most reliable source for this information is your Accord's owner's manual. It should have a diagram of the engine with the firing order clearly labeled.
2. Look under the hood: Check for a sticker or tag under the hood that might show the firing order.
3. Use an online service: Websites like AutoZone or Advance Auto Parts often have diagrams and repair guides specific to your car's year, make, and model.
4. Visit a mechanic: If you're unsure, consult a qualified mechanic. They can identify your engine type and correctly install the spark plug wires.
Remember, always double-check your information and take precautions when working with electrical components.