I just had the truck at the dealership, it was missing when under a load and check engine light was flashing. The dealership ran some tests and said it was a code P0306, the COP on the #6 cylinder was bad. They replaced this and charged me a total of $208. Does this sound right? I thought something like that would be under my limited powertrain warranty.

I fount the part online for $42.99 and questioned them about replacing it myself if it happened to another coil. They tried to give me every excuse why I couldn't. Could I not just take the truck to Autozone and have them scan the code, then buy a coil and replace it myself if this happens again?

 

You can replace them yourself. They are really easy as long as you have identified which one is acting up. Just remember not to over tighten the little 7mm bolt that holds it in place and make sure the wiring snaps back on.

 

4.6 or 5.4?

 

It is a 2005 5.4

 

I'm thinking the same thing. My COP on CYL 1 went out while I was under warranty and they did the COP and plug for that cylinder(very surprised they changed the plug as well).

My question is though, how are we certain which COP it is? My code was P0171, lean on bank 1 so I wasn't certain what it was until the service tech found it while driving with his diagnostic laptop.

 

The tech probably did a power balance test while under load. That identifies the suspect cylinder.

 

Sounds like something a home mechanic can't do...

 

Anyone use this? http://www.aeswave.com/products/Product.asp?i=660 This tool is for test each coil.

 

What you can do if you are getting a code take that coil off and place it on cyl 1 if you get the code and it points to that cyl its the cop. I had a few go out on me and this is how I found out that cop it was

 

That's an awesome idea, good work.