The firing order for Ford's 4.2L V6 engine (used in models like the Econoline/E-Series vans and F-150 trucks from approximately 1997 onwards) is 1-4-2-5-3-6.
Where to Find Reliable Diagram Sources
- Ford Factory Service Manual: The definitive resource. Provides the most accurate, detailed diagrams and specifications for your specific model year.
- Reputable Repair Manuals (Physical or Digital): Publications from Haynes, Chilton, or Motorcraft (Ford's own brand) specifically covering your vehicle. Look in the "Engine Tune-Up," "Ignition System," or "Engine Mechanical" sections.
- Trusted Online Automotive Repair Databases: Professional subscription services used by mechanics often provide accurate diagrams. While direct links aren't provided here, reputable auto parts store websites sometimes offer basic repair guides accessible with your vehicle details.
Ford 4.2L V6 Firing Order Details & Identification
The cylinders are numbered:
- Front of vehicle (radiator end) is Cylinder #1.
- Cylinders on the Driver's Side (US/Left-Hand Drive) bank: 1 (front), 2 (middle), 3 (rear).
- Cylinders on the Passenger Side (US/Right-Hand Drive) bank: 4 (front), 5 (middle), 6 (rear).
The firing order sequence is: 1 - 4 - 2 - 5 - 3 - 6.
Step by Step: Identifying the Firing Order Using a Diagram
- Locate the Diagram: Find the "Engine Firing Order" or "Ignition System" diagram in your chosen manual or reliable source.
- Identify Cylinder Numbers: The diagram will clearly label cylinders 1 through 6 according to the standard Ford numbering described above. Verify physical cylinder locations match the diagram markings.
- Trace Spark Plug Wire Routing (Coil Pack/Cap):
- If your engine uses a distributor cap: Find the cylinder number marked at the cap's terminal position corresponding to the wire going to cylinder 1. Trace the sequence of terminals clockwise or counter-clockwise around the cap as indicated by the diagram arrows or numbering.
- If your engine uses coil-on-plug (COP) without a distributor: Find the firing order sequence label on the coils or the wiring diagram showing the order cylinders fire.
- Verify the Sequence: Follow the sequence shown on the diagram from Cylinder 1 to Cylinder 4, then 2, 5, 3, and finally 6. This visual path confirms the 1-4-2-5-3-6 order.
Critical Considerations
- ALWAYS Verify with Diagram: Never rely solely on memory or generic descriptions like this one when working on your engine. A single misrouted spark plug wire will cause severe misfires.
- Cylinder Location is Key: Correctly identifying the physical cylinder locations according to Ford's standard is essential before interpreting the firing order diagram.
- Source Matters: Factory manuals or highly reputable repair manuals are the gold standard. Be cautious with unverified online sources.