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.
The 5.4 liter V8 engine , available in the 1998 Ford Expedition has a Coil On Plug ( C.O.P. ) ignition system
On a 1998 Ford Expedition : The 4.6 liter V8 has the Electronic Distributorless Ignition System ( EDIS ) and it has ( 2 coil packs ) along with the ( 8 spark plug wires ) ------------------------------------------------------------------------------------------------ The 5.4 liter V8 has the Coil On Plug ignition system and has ( 8 ) individual coils
On a 2001 Ford Expedition : Both the 4.6 and 5.4 have the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils
Your 2001 Ford Expedition has the Coil On Plug ( C.O.P. ) ignition system so there are ( 8 ) individual coils
On a 1998 Ford Expedition : One way is : The 4.6 has the Electronic Distributorless Ignition System ( EDIS ) and has ( 2 ) coil packs and ( 8 ) SPARK PLUG WIRES The 5.4 has the Coil On Plug ( C.O.P. ) ignition system and has ( 8 ) individual coils
No distributor The 4.6 liter is EDIS ( Electronic Distributorless Ignition System ) and has ( 2 ) coil packs The 5.4 liter has the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils
at each spark plug
Suggest you visit your local public library, and find the Chilton's Repair Manual for the 1999 Ford Expedition. They show the wiring diagram for the ignition coil in the Manual.
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
Yes , the 2007 Ford Expedition engine has the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils
On a 1997 Ford Expedition : The 4.6 has the Electronic Distributorless Ignition System ( EDIS ) It has ( 2 coil packs with four towers each for the spark plug wires ) ------------------------------------------------------------------------- The 5.4 has the Coil On Plug ( C.O.P. ) ignition system It has ( 8 ) individual coils
On a 1998 Ford Expedition , 5.4 firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle