Here's where you should look:
1. Your Owner's Manual: The most likely place is your vehicle's owner's manual. It should have a section on engine maintenance, including a firing order and, potentially, a diagram showing the spark plug wire routing.
2. Repair Manual: A Haynes or Chilton repair manual for your specific year and engine size will definitely have a detailed wiring diagram, firing order, and potentially even pictures showing the spark plug wire routing. These are available at auto parts stores and online retailers.
3. Ford's Website (Possibly): Ford's website might have some service information, but accessing detailed diagrams often requires registration or a paid subscription.
4. Online Forums: Search online forums dedicated to Ford Econoline vans or trucks. Someone might have posted a picture or description of their spark plug wire routing for a similar vehicle. Be sure to specify the engine size in your search.
5. Local Auto Parts Store: A knowledgeable parts counter person at an auto parts store (like AutoZone, Advance Auto Parts, or NAPA) might be able to find a diagram in their computer system or in their repair manuals.
Important Considerations:
* Engine Size: Knowing your engine's displacement (e.g., 4.9L, 5.8L, 7.5L) is crucial. The firing order and wire routing will be different for each engine. This information is usually found on a sticker in the engine compartment.
* Firing Order: The firing order is the sequence in which the spark plugs fire. This is essential for proper engine operation. The diagram will usually show the firing order, allowing you to correctly route the wires.
Don't attempt to replace spark plug wires without a reliable diagram. Incorrect routing can lead to misfires, poor performance, and potential engine damage.
