I assume you have the 5.4 L with the Coil On Plug ( C.O.P. ) ignition system firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
Here is the number three coil pack located?
coil pack #3 should be atop # 3 cylinder
second coil pack back from the front on passenger side
Go to AutoZone have them rear your codes for FREE. This way you will know which Coil Pack is goig bad / or is bad. If you have a 4.6L you will have only 2 Big Coil Packs. If you have the 5.4L you will have 8 Coil Packs , One coil pack for each cylinder.
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On a Ford Expedition , 4.6 with the Coil On Plug ignition system firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
Your 1998 Ford Expedition 5.4 L - V8 engine has a COIL ON PLUG ignition system The engine cylinders / spark plugs / coils are numbered : FIREWALL 4 - 8 3 - 7 2 - 6 1 - 5 FRONT
if water is getting on the coil pack. that will cause it to burn out.
Firing Order; 4.6L = 1-3-7-2-6-5-4-8 5.4L = 1-3-7-2-6-5-4-8 Coil # 6, is where cylinder # 6 is. and so on...
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Ford Expedition