Expedition Electrical Coil
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Junior User
Joined: Apr 2005
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Expedition Electrical Coil
Hi Guys,
I have a 1998 Ford Expedition with the 5.4L engine.
I know one of the ignition coils is bad since I've had this issue in the past. However, in the past, I have been lucky enough that the coil was bad enough to send an error code to the code reader to tell me which coil was bad.
Recently, when the truck is running for a while and its hot outside, the bad coil will start to act up and cause the engine to misfire.
My question is how do I go about figuring which coil is bad? Do I have to just replace all 8 coils?
I have a 1998 Ford Expedition with the 5.4L engine.
I know one of the ignition coils is bad since I've had this issue in the past. However, in the past, I have been lucky enough that the coil was bad enough to send an error code to the code reader to tell me which coil was bad.
Recently, when the truck is running for a while and its hot outside, the bad coil will start to act up and cause the engine to misfire.
My question is how do I go about figuring which coil is bad? Do I have to just replace all 8 coils?
Fleet Owner
Joined: Apr 2008
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The next time it's acting up, with the engine running unplug the 2-wire connector going to each coil one at a time. When you find one that doesn't effect the engine when disconnected, you've found the one acting up. Keep in mind that every time you disconnect a connector a trouble code will be set. They should go away at the next ignition off to on cycle.
Be careful not to get yourself or your clothing caught in the fan or serpentine belt when doing this.
Be careful not to get yourself or your clothing caught in the fan or serpentine belt when doing this.
Thread Starter
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Junior User
Joined: Apr 2005
Posts: 76
Likes: 1
The next time it's acting up, with the engine running unplug the 2-wire connector going to each coil one at a time. When you find one that doesn't effect the engine when disconnected, you've found the one acting up. Keep in mind that every time you disconnect a connector a trouble code will be set. They should go away at the next ignition off to on cycle.
Be careful not to get yourself or your clothing caught in the fan or serpentine belt when doing this.
Be careful not to get yourself or your clothing caught in the fan or serpentine belt when doing this.
thanks for the advice, I will try it. When it does happen, its usuallly while i'm driving on the freeway and its hot in vegas with the ac on. Around 60 mph, i will let off on the gas and then give it a little gas and thats when the engine misfires.
Freshman User
Joined: Jun 2010
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I have a coil boot that wont come out!
Cyl #1 came out fine, but #3 is stuck. And #3 is the one that is misfiring, so I currently suspect... arcing has melted the thing to the inside of the hole. Is this normal with "leaking" boots?
I've tried pulling on the boot pretty hard with pliers and it wont come up. Any ideas how to resolve this?
Cyl #1 came out fine, but #3 is stuck. And #3 is the one that is misfiring, so I currently suspect... arcing has melted the thing to the inside of the hole. Is this normal with "leaking" boots?
I've tried pulling on the boot pretty hard with pliers and it wont come up. Any ideas how to resolve this?
Fleet Owner
Joined: Apr 2008
Posts: 24,316
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I would just try to slide a long thin screwdriver down there, tap it with a hammer and try to break the boot free from the sidewall. Once it's out, do your best to clean the rest of the sidewall so the new boot/coil doesn't get damaged.
Freshman User
Joined: Jun 2010
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Good idea alloro! I got it loose, and apparently without damaging it. It seems it was not melted, but it was RUSTY. Hmmmm... more clues.
I've swapped coil & boot with a known good cylinder. I still get misfire on #3. So now given that there were signs of rust down there, and knowing its NOT the coils in my case... should I suspect bad plug, or bad injector?
I guess I am on to the next task: trying to determine which. Ideas welcome, but at this point, it appears its not longer a coil conversation for me.
I've swapped coil & boot with a known good cylinder. I still get misfire on #3. So now given that there were signs of rust down there, and knowing its NOT the coils in my case... should I suspect bad plug, or bad injector?
I guess I am on to the next task: trying to determine which. Ideas welcome, but at this point, it appears its not longer a coil conversation for me.
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