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Are you sure the spark plug wires are on the correct spark plug? Recheck the firing order and spark plug wires. Additionally check timing on distrubutor
a factory weatherstripping on the hood leaks causes the cylinders 2 &3 on the pass side to misfire. pull the coils for the cyl. .take off boot with long spring inside, thats your plug wire. they are rusty, no? clean them up, put some dielectric grease all over the spring and reassemble. theres your prob!!!!
for 1998 Ford Truck Expedition 4WD 5.4L EFI 8cylthe Oxygen Sensor is located under vehicle, driver side, below seating area, mounted in exhaust pipe in rear of catalytic converter.
1998 Ford Truck F150 1/2 ton P/U 4WD 5.4L EFI 8cyl The Oxygen Sensor is located under vehicle, passenger side, below seating area,
rear of catalytic converter, mounted in exhaust pipe.
1991 Ford Truck F150 1/2 ton P/U 2WD 4.9L FI 6cyl
Firing order 1-5-3-6-2-4
10 Degrees
1991 Ford Truck F150 1/2 ton P/U 2WD 5.8L FI Windsor 8cyl
Firing order 1-3-7-2-6-5-4-8
10 Degrees
1991 Ford Truck F150 1/2 ton P/U 2WD 5.0L FI 8cyl
Firing order 1-5-4-2-6-3-7-8
10 Degrees
that is true your firing order is wrong here is a link to a web sight that has all the 1998 explorers 6cyl just click on the one that your explorer is and it'll show you the correct firing order also make sure you have your plugs gaped right good luck.
http://autorepair.about.com/library/firing_orders/bl-ford-firing-98.htm
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