red05f15

So I need any help I can get lol.
Last night I changed all the plugs and coil packs on my truck, I was having a misfire. Today, I noticed the truck idles a little rough, not anything real bad but noticeable. I went from master craft plugs to the one piece champion plugs. Only thing I unhooked where the computer on the passenger side firewall, and all the clips on the fuel rail and the coils. I didn't break any of the old plugs when removing them. Thanks in advance for any help

lewissa81

There have been many reports of the champion plugs causing misfires and rough idle in these engines, so that's one possibility.
Did you use antiseize on the new plugs? Using too much of it and getting some on or near the grounding strap can cause some issues.
Did you go through the PCM relearn procedure after reconnecting the pcm and battery?
Did you get Motorcraft COP's, or aftermarket?

red05f15

I did not use antiseize. What is the relearn procedure? And I also got aftermarket COPs

red05f15

Should I start by replacing the plugs with the mastercraft plugs?

lewissa81

I would put Motorcraft plugs into there. However, some people have no issues with champion, so it's your call.
Here's the procedure to allow your PCM to learn what it needs to know:
https://www.f150forum.com/f72/batter...rocess-133736/

You don't really HAVE TO do this. The PCM will learn and adjust overtime. The procedure just allows it to learn quickly.

red05f15

I didn't disconnect the battery so would that make a difference? Also I used wd40 to loosen the carbon build up, not sure if that makes a difference

lewissa81

For future reference, always disconnect the battery before disconnecting tell PCM.
By disconnecting the PCM, the power source(battery) was disconnected from it. This resets its parameters just like taking the battery out.

red05f15

I did the whole relearn process and it didn't really do anything

red05f15

Also, I smell gas when idling, and when at idle my mpg drops

lewissa81

If you smell gas, then check the plugs to make sure they're torqued properly.
Mpg's will always drop at idle.