* Owner's Manual: Your owner's manual should have a diagram, or at least a section on engine maintenance that will point you towards the correct firing order.
* Online Repair Manuals: Sites like Chilton, Haynes, and AutoZone often have repair manuals available for download or viewing online. These usually contain detailed diagrams. Search for "2002 Ford Ranger [Your Engine Size] repair manual." Be sure to specify the engine size!
* Ford's Website (potentially): While less likely to have a readily available diagram, Ford's website might have some service information if you have the VIN.
* Independent Automotive Websites: Websites focused on automotive repair often have forums and community sections. Searching the forum for your specific year, model, and engine might yield results with someone who has already shared a diagram or has experience with your exact setup.
* Local Auto Parts Store: Auto parts stores like AutoZone, Advance Auto Parts, or NAPA can often print out diagrams or look up information for you if you provide them with your vehicle's year, make, model, and engine. This is a quick and easy option.
Crucially: Pay attention to the firing order. The diagram will show you which cylinder each wire goes to, but the firing order (the sequence in which the cylinders fire) is critical to proper engine function. Get this wrong, and your engine won't run correctly. The firing order is usually found in the same resources as the wiring diagram.
Remember to always double-check the information against your specific engine. If you're unsure about any step, consult a professional mechanic.
