My 2011 eb has 3 coil pack fail about 3 months ago now the truck has symptoms of coil pack failure again. Truck is cutting out. Is it common to have to replace coils at 55k?

 

Lincoln LS/ Jaguar S-types are highly known to go through coils on all their engines. I pioneered the fix of using 2v 4.6/5.4 coils, making custom brackets, and re-wiring the connectors as a fix.

Where I'm going with this is I learned so much on my trip to finding the fix for those cars. Once thing I learned is that you can't use different brands of coil or they will fail sooner. Must have something to do with the impedance and the amount of power sent to each coil being equal but the power needed not being equal, but that's a guess. So if you have replaced one or more coils make sure they of of the exact same as the rest and even then you might have to replace all at the same time for them to work properly.

My second thought is to see if the 5.0 coils fit the ecoboost because they make aftermarket coils for it. Check to make sure they are of the same polarity as the eco first.

 

Have the plugs ever been changed or at least regapped to the proper gap that they should have been from the factory? Many 2011's have the older plug model in them and have all sorts of various gap numbers on them, especially if you have 30-40k miles or more on them. It wouldn't be a bad idea in my opinion, to buy a new set of SP-534 plugs and gap them all at .030 and at least start there to make sure you don't have a cheap and easy fix to your problem.

Plugs can be had for very cheap and the entire swap of the plugs can be done in about 30 minutes. The EB is super easy to change plugs.

 

^^^^^ THIS!
The EB spark plugs only have a good life of about 40,000 miles. I swapped mine out at 41K for the newer SP-534 gapped at .030 and it took care of my misfires.
The tech said that 2 of my old plugs were absolutely done. Ford needs to change the service interval on those, and many shops won't even look at plugs for issues unless you make them. I will be changing mine at 35K intervals from now on.

 

Agreed, change and gap the plugs first...

But I have seen trucks with 50,000 plus miles that have coil pack issues. If you can datalog and pinpoint the misfire and what cylinder, then you can replace that coil and move on with life. But it is not a bad idea to put a fresh set in and chalk it up to maintenance on these trucks. Let us know what you find out.

 

Just changed plugs and it fixed problem! Thanks!

 

Ding ding we have a winner Glad it worked!

 

Doh, I knew of this problem but completely forgot. Much cheaper and easier

Glad all is good now, you might enjoy more benefits now too.

 

Yeah I started having trouble around the same time. Have 110k now on mine and have been through 2 sets of plugs and 2 sets of coil packs.

 

If you have an Ecoboost, you should probably be on your 3rd set of plugs. Mine failed at 40K.