SOURCE: SPARK PLUG WIRES
Plugs are numbered from the front of the engine to the back of the engine.
Good Luck
SOURCE: Fuel injector cut off switch for 1999 ford contour se
Try looking by your left foot, while sitting in the drivers seat.
SOURCE: removed spark plug wirers need firing order Ford Expedition 1999
Several engine sizes there...
1999 Ford Expedition 4.6 liter SOHC V-8 VIN "6"
1999 Ford Expedition 4.6 liter SOHC V-8 VIN "W"
1999 Ford Expedition 5.4 liter SOHC V-8 VIN "L"
Hope this help to solve it (remmeber comment and rated this).
SOURCE: diagram on the firing order
For a six cylinder engine the firing order is 1 4 2 5 3 6
For a four cylinder engine the firing order is 1 3 4 2
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