Just had my engine replaced in December, drove good for a month. Started noticing the truck being jumpy when I was driving home. Checked the codes and it said misfire in cylinder one and misfire in cylinder 3 and I had fuel injector code on cylinder 3. I replaced spark plugs ignition coils and fuel injectors on both. Then my 1st cylinder coil pack starting breaking about 10 seconds in on the new ones I’ve replaced them 4 times and still having the same issues a mechanic told me I was getting too much voltage to it so I’ve replaced my pcm and still the same thing, I’m smoking out of the back of the truck and nobody can find my issue they have said wires are all good I’m not too sure how far they looked but I’m at a loss it shakes super bad while driving and it flashes an engine code while driving I’ve learned if I unplug cylinder 1 it works better but if I plug it back in it will kill the truck

 

Flashing check engine lite is a misfiring cylinder. (or more....) What is alternator voltage when engine is running? Should be under 15 volts, if its over that, you have a voltage regulator problem. (which is in the pcm......) Also, what brand coils are you buying? If you are just getting the cheapy parts store fellers, might try something a bit higher quality.

 

so I’ve replaced them with low quality and high quality and it keeps popping them, I haven’t checked the alternator. It’s at a different mechanic now I’m just trying to help find the issue quicker

 

What spark plugs did you install, and what does the factory call for??

 

i used copper and iridium because they didn’t have 16 of the same ones so I got 8 and 8

 

Does one coil fire two plugs on that motor? Or does each plug have an individual coil??

 

one coil fires two plugs

 

If you have the coils firing one of each type, that may be a problem..... if the factory wants one type, installing a different type (copper vs. rare earth) can also be a problem. I would replace the plugs that aren't what the factory wants, and see if things improve.

 

I switched the plugs out for both copper and ran good for about 30 minutes and the code was cleared. I drove down the road and it was running great then turned around and then code came on and flashed and I got it back to the shop and it popped the coil pack again I used a factory coil pack and a aftermarket one.

 

Of all the possible causes of coils burning up, the only one I find that makes any sort of sense, is a poor ground..... Pretty much everything else is environmental, if that were the case, I would expect to see other coils failing as well. And since it has happened to several coils, in the same location, but, other coils of the same type work just fine elsewhere..... Gotta be something in the ground. I might be tempted to replace the connector for that coil, and also clean the connector for it at the PCM side.