2014 Expedition Misfired twice

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Crixus12

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Hey there.

Ive had my 2014 Expedition EL since it was new and I am just approaching 90,000 miles.

Twice in the past two years (maybe three years) when I would accelerate (hate to say, peddle to the metal) while merging uphill on a ramp, same spot both times, my car would not exceed about 35mph and the check engine would flash, putting me in limp mode practically for about 1 minute. Then it will drive normally and can’t replicate it. Light goes away but with a garage scanner there is a stored misfire code in cylinder 8. Not sure if this matters but I believe both times it was about sub 40F and the car was only about 3-5 minutes warmed up/running. As of now. No stores codes since I last cleared it.

I’m only about 7k miles away from the manufactures recommendation to replace all plugs (which I will replace with all new boots as well, bought from RockAuto- all Motorcraft brand).

My question is should I be concerned at all about cylinder 8 or the ignition coil? As mentioned, this hasn’t occurred since. Any other thoughts?

Thanks for the help!
 
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bloodhound

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Hey there.

Ive had my 2014 Expedition EL since it was new and I am just approaching 90miles.

Twice in the past two years (maybe three years) when I would accelerate (hate to say, peddle to the metal) while merging uphill on a ramp, same spot both times, my car would not exceed about 35mph and the check engine would flash, putting me in limp mode practically for about 1 minute. Then it will drive normally and can’t replicate it. Light goes away but with a garage scanner there is a stored misfire code in cylinder 8. Not sure if this matters but I believe both times it was about sub 40F and the car was only about 3-5 minutes warmed up/running. As of now. No stores codes since I last cleared it.

I’m only about 7k miles away from the manufactures recommendation to replace all plugs (which I will replace with all new boots as well, bought from RockAuto- all Motorcraft brand).

My question is should I be concerned at all about cylinder 8 or the ignition coil? As mentioned, this hasn’t occurred since. Any other thoughts?

Thanks for the help!

Presumably you mean 90,000 miles. Your plugs are worn, which caused a misfire under load in cylinder 8.
 

07navi

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I would replace the plugs now and see how it goes. (Bloodhound beat me to it by seconds). Just the pugs and make sure all the boots are good and the plug holes are clean.
 
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Crixus12

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Presumably you mean 90,000 miles. Your plugs are worn, which caused a misfire under load in cylinder 8.
Edited. Thanks for catching that!
Perfect. Just didn’t want to ignore something else. Thanks for the response.
 

JamaicaJoe

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Just change all the plugs and the boots. The coil might be fine. If you still get a misfire on that same coil, change it. You might mark that coil in case the mechanic mixes it up with another.

You can't get more than 45K on plugs despite what Ford claims. It is a myth.

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07navi

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Just change all the plugs and the boots. The coil might be fine. If you still get a misfire on that same coil, change it. You might mark that coil in case the mechanic mixes it up with another.

You can't get more than 45K on plugs despite what Ford claims. It is a myth.

Sent from my SM-T350 using Tapatalk
I agree, I change mine every 30k miles but that's just me. They are like tires, they start wearing out from day one.
 

JamaicaJoe

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If I were the OP I would not be giving full throttle at freezing temps with only a few minutes of warm up.

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Thunderbirdsport

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Mine just did the same thing last night, for the first time. New plugs today, we'll see what results. Been noting a drop in MPGs, figured it was the bigger tires. Not so sure that the size increase is going to cause a loss of 5 MPG though...

So like I said, I'm gonna do new plugs in a bit. Freezing rain today so may as well do something under a roof.
 
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