The 4.2-liter V-6 engine in a Ford F150 is good trade-off between power and economy. It gets better fuel mileage than a V-8, yet has enough power for most hauling chores. Knowing the firing order of the engine is essential when servicing or troubleshooting the vehicle.
Read the Factory Manual
Having access to a factory service manual is essential when working on this engine. Manuals can be purchased at a Ford dealership or found online.
The firing order for a 2002 F150 with a 4.2-liter V-6 is: 1-4-2-5-3-6. The firing order determines when each spark plug will spark and ignite the fuel-air mixture for that cylinder.
Location of Spark Plugs
As seen from the front of the car, looking toward the firewall, the left bank of cylinders is 1-2-3, closest to farthest. The right bank is 4-5-6, closest to farthest.
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