Once you know the engine size, you can:
* Consult your owner's manual: This is the best resource. It will have diagrams showing the location of the spark plugs and other components.
* Use an online repair manual: Sites like Chilton or Haynes offer repair manuals specific to your vehicle's year, make, model, and engine. These often have detailed diagrams and instructions.
* Search online for images: Search on Google Images or YouTube using search terms like "2005 Chevy Colorado [engine size] spark plug location". You might find photos or videos showing the location.
Generally speaking, spark plugs are typically located on the top of the engine, but access might require removing some components like plastic covers or air intake parts. They are usually fairly easy to reach once you have a clear view of the engine.