Check engine light

[edcombs87]

I am dealing with some problems that I cannot figure out. Just bought this 2014 ram 1500. Throwing code for cylinder 4 misfire. So I changed plugs and coil. Nothing changed still running really rough. I pull plug for coils and cylinder 2 and 4 both change nothing when unplugged. Others are normal. Tried reseting cel with scanner and it won't delete codes. Left battery unplugged all night and it still didn't reset anything. Pulled pcm fuse this morning and that changed nothing as well. Doesn't really make any sense to me. Also may be unrelated but the radio won't come on at all. Thanks. I am new here and to rams.

 

[rzr6-4]

.......do you hear any ticking?

May have the infamous cam/lifter issue and the previous owner dumped it on you to deal with. If so, have $fun$.

 

[Jeepwalker]

So you swapped coils to different cylinders, right? And the code still persists in the same cylinder 4, as originally, right?

I would remove the pass side valve cover & do the check as in the video below, looking at Cyl 4 rocker arm movement. Hopefully you won't find what they found and you can move on to other troubleshooting possibilities. Note: There's tons of videos on Ram/Chrysler cam failures...and lots on this forum too. The word is the replacement lifters have larger bearings and thus far don't seem to be as problematic on newer pickups too:

This is Why Hemi Engines Fail

Click here to see where I actually do the repair on this truck and replace the lifters and camshaft:How to Replace The Lifters and Camshaft on a 2013 Dodge R...

www.youtube.com

 

[62Blazer]

As suggested above, there can be multiple reasons for a cylinder misfire besides just the coil and plug. Just for people searching this in the future, the first step should be swapping components between cylinders to see if the code stays with the same cylinder or follows the parts. That keeps somebody from spending money on replacing parts that may not have an issue to begin with.
The next steps for a decent mechanic would be to check if you have the proper power and signal to the coil........meaning is the ECM actually commanding the coil to fire and does it have the proper power and ground. If the plug is firing as it should the next step is to look for a mechanical issues. This can be performed by methods such as a relative compression check, actual compression check, or sometimes even a visual inspection by removing the valve cover.

 

[Jeepwalker]

Good point..the coil wiring.

I guess we haven't mentioned injectors either.... But removing the valve cover and looking, at some point in time, can easily and quickly rule out the worst-case item.