Please give me some advice.
I have a 2004 Ram, 1500, 4x4 5.7L Hemi with 115K miles. I bought it used.
It was running great then P2311 Ignition Coil D Sec Circ lit up the dash. It is missing and lost power and I have lost two miles per gallon!

What I have done:
The #4 coil looked warped at the bottom and melted.I swapped it with #1, cleared the codes and got P2311 again. Nothing else so the ugly coil tested fine.
The plugs and wires looked to be original so I replaced them all, cleared the codes and P2311 came back again.
Since #7 and # 4 coils cross fire the others secondary coils I swapped coil #7 with #2 just because #2 was easy to get at.
Cleared the codes and P2311 came back with the misses and crappy gas mileage.

That's all I have done and I'm out of ideas with out replacing the harness between the coils and the computer and the computer itself.

Give me a yell and help me out please.
Joe

 

I hope will all that swapping you didn't mix up cylinders?

Your coil pack could be an issue. You should measure the resistance of the wires as well to eliminate the guessing game. They should have very low readings.

 

Rich,
Thanks for the response. I removed each coil, plug and wire one at a time so I doubt I mixed them up. Good call though. As to checking the resistance are you talking about the individual spark plug wires from each coil or the ignition harness from the computer to the top of each coil?

 

Update:
I replaced two coils that had slightly different resistance readings. (one was the damaged coil), I inspected the inputs to the coil as far as I could see and found them to be in good shape. Is there a resistance check I can do on the inputs to the coil? If so what should it be? After this I guess I will have to take it to the dreaded shop...

 

I'm not sure what the resistance should read but, they should all be around the same amount.

 

Xtremedurb00,
Thanks for your help. I will get at them over the next day or two.

 

No problem...Hope it helps you out. If you can't find anything. Id run a volt meter over everythingk and see if you losing any power.

 

I did check for 12VDC at the input to the coil and a chassis ground.
I found on each paired lead, one wire had 12 VDC (usually 13.5 ish) and the other had a pulse, they were all the very similar, I'm not sure what the pulse is supposed to do, however, they are all the same as well. I am about at the end of my ability.

thanks for your help.

Joe

 

well, I’ve got the same issue with my 2013 charger. After a couple’s months trying to figure it out, I now believe I have a rocker arm issue causing the problem