However, simply knowing the firing order isn't enough to connect the wires correctly to the spark plugs. You need a diagram or to carefully trace the wires. Here's why and what you should do:
* Wires aren't numbered sequentially: The spark plug wires aren't typically marked 1 through 6. They're often color-coded, but the color code itself isn't standardized across all Aerostars.
How to Connect the Wires:
1. Find a Diagram: The best approach is to find a wiring diagram specific to your 1995 Ford Aerostar 4.0L engine. You can try these resources:
* Your Owner's Manual: Check the owner's manual; it might have a diagram.
* Haynes or Chilton Repair Manual: These manuals are readily available and contain detailed diagrams.
* Online Forums: Search online forums specific to Ford Aerostars (like Ford-trucks.com or similar). Someone may have posted a picture or diagram.
* Auto Parts Store: Most auto parts stores (like AutoZone, Advance Auto Parts, etc.) can look up a diagram for you using your VIN.
2. Trace the Wires (If you can't find a diagram): This is much more difficult and prone to error, but if you absolutely can't find a diagram, you can attempt to trace the wires. This is strongly discouraged unless you are very experienced with automotive electrical systems. It's very easy to mis-wire and cause damage.
3. Label the Components: Before you disconnect anything, use masking tape and a marker to clearly label each wire and where it connects (e.g., "plug 1," "coil 3," etc.). This will help you reconnect everything correctly.
Important Note: Improperly connecting the spark plug wires can lead to misfires, poor performance, damage to the engine, or even a no-start condition. If you are not comfortable with this task, take your vehicle to a qualified mechanic.
