I have a 2015 5.0 XLT and started to get a miss fire on the #6 cylinder. I swaped the #5 coil pack to the #6 ran the car had a rough running engine. Pulled the #5 coil pack and it had melted. Got a new coil pack and ran it for 10 min and the same thing melted the new coil pack. When I check the volts on the #5 coil connector I get 15V. I have pictures attached. Any help is appreciated!

 

Hello, I have the Exact same problem with my 2015 F-150 lariat, with 5.0 I've been threw three coil packs already. I replaced the Connector because I thought maybe that was the issue to no avail. The last coil pack I purchased I decide to just hook it to the connector without even installing it in the cylinder, The coil pack started to get extremely hot without the Truck even running but the switch was on but I did not start the truck it still overheated the Coil pack. I do hope you found a solution and will share with me what you found.

Thanks

 

Try switching injectors from another cylinder. A no fuel misfire will cause the coil packs to work WAAYY harder than they are supposed to, mix that with high ethanol fuel and you have a recipe for overheated electrics... It may cost you another coil, but without a scope, its the easiest way to find out if it was a fuel misfire problem or not

 

If it's the same cylinder every time, Same thing.... try moving the injector off another cylinder to see if the problem moves. If its different cylinders every time, check your fuel pressure. If it goes long stretches in between blown packs (on different cylinders) check the fuel pump specifically.

But if its the same cylinder every time, it's probably an injector-specific problem. Moving the injector is reasonably easy, and if you're the labor, free diagnosis

 

It's not an injector issue as he reported the coil got hot without the engine operating.

It's a short-to-ground in the coil river circuit, wither in the PCM or in the wiring harness between the PCM and the coil.

 

Project sho, Thank You Im in agreement with your diagnosis, Since the Coil Pack is getting Hot even without the Engine Running and the Coil not even installed in the Cylinder it seems more Feasible that it’s a wiring issue. Any suggestions on how I may repair that or is it an issue where I need to take it to the shop?

I would greatly appreciate any advice on how to repair this wire.

Thanks

 

Disconnect battery, connect an ohmmeter between the shorted coil driver circuit and ground. If the short is present, disconnect the PCM connector and see if the short stays or goes. If it stays, it's a wiring fault, probably a chafed or pinched wire. If it goes, the PCM has an internal failure.

 

I guess I must have missed the engine off part....

 

I’ve read a couple posts on the same coil/grounded melted problem, what was the diagnosis and fix?

 

It's in Post #7.