coil packs?
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Senior User
Joined: Jul 2009
Posts: 218
Likes: 1
From: Ashland, Mississippi
coil packs?
2003 Expedition, 4.6L, 140,000 miles.
This is the wifes expedition. She told me it was running a bit rough and the service engine soon light came on. I took it for a ride and could tell it was missing pretty bad. Went to the local parts store, they hooked it up to the diagnostic tool and it showed misfire on #1. I went ahead and bought a new coil pack and took it home. Disconnected neg. battery cable and installed the new coil pack on #1. Now the thing seems to be running even worse but the service engine soon light is not coming on. Tried to check it for codes but no codes. What gives?
Thanks
This is the wifes expedition. She told me it was running a bit rough and the service engine soon light came on. I took it for a ride and could tell it was missing pretty bad. Went to the local parts store, they hooked it up to the diagnostic tool and it showed misfire on #1. I went ahead and bought a new coil pack and took it home. Disconnected neg. battery cable and installed the new coil pack on #1. Now the thing seems to be running even worse but the service engine soon light is not coming on. Tried to check it for codes but no codes. What gives?
Thanks
Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
Just an FYI, but a coil pack has spark plug wires and serves multiple cylinders. A COP (Coil On Plug) connects directly to the spark plug and servers one cylinder.
Might want to get back in there again and swap the spark plug with cylinder #3's plug and swap the injector with cylinder #2's injector and see if it eventually sets a code for one of those cylinders. (If it still says #1 is misfiring you may have a poor connection at the coil primary or the injector power/ground circuit for cylinder #1.
Might want to get back in there again and swap the spark plug with cylinder #3's plug and swap the injector with cylinder #2's injector and see if it eventually sets a code for one of those cylinders. (If it still says #1 is misfiring you may have a poor connection at the coil primary or the injector power/ground circuit for cylinder #1.
Postmaster
Joined: Jan 2009
Posts: 4,584
Likes: 3
From: Chesapeake, Va.
It will in time. Check the wire connections at each of the injectors. You may have popped one off.
Laughing Gas
Joined: Jan 2003
Posts: 1,082
Likes: 40
From: Melbourne, FL
Are you certain you changed the right coil? I had a misfire recently and installed a new spark plug at the cylinder the parts store guy told me was #7. When the misfire was still there, I looked up the cylinder numbers on a hunch and found that he had the sides reversed and had me change #3.
As for the code not being there, they take a certain number of instances to occur and/or trips to be made before the code sticks.
As for the code not being there, they take a certain number of instances to occur and/or trips to be made before the code sticks.
New User
Joined: Feb 2011
Posts: 20
Likes: 0
I always start with changing plugs with misfire codes. Use a motorcraft or autolite plugs. I have found in the past anything else doesn't work very well in Fords. Make sure you gap them. They do not come pre gapped as I have heard parts people tell poor souls who believe them. Should be .054", but double check that.
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Senior User
Joined: Jul 2009
Posts: 218
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From: Ashland, Mississippi
I went ahead and ordered all new coil packs and scheduled to have the shop do the plugs and coil packs. And yes I know I can save some money and do it myself but that back plugs look like a pain and I just dont really have time to mess with it.
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2003 Expedition, 4.6L, 140,000 miles.
This is the wifes expedition. She told me it was running a bit rough and the service engine soon light came on. I took it for a ride and could tell it was missing pretty bad. Went to the local parts store, they hooked it up to the diagnostic tool and it showed misfire on #1. I went ahead and bought a new coil pack and took it home. Disconnected neg. battery cable and installed the new coil pack on #1. Now the thing seems to be running even worse but the service engine soon light is not coming on. Tried to check it for codes but no codes. What gives?
Thanks
This is the wifes expedition. She told me it was running a bit rough and the service engine soon light came on. I took it for a ride and could tell it was missing pretty bad. Went to the local parts store, they hooked it up to the diagnostic tool and it showed misfire on #1. I went ahead and bought a new coil pack and took it home. Disconnected neg. battery cable and installed the new coil pack on #1. Now the thing seems to be running even worse but the service engine soon light is not coming on. Tried to check it for codes but no codes. What gives?
Thanks
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