Well, I changed the front 4 plugs a month or so ago and once I got everything back together I found out the #6 cop went bad. So I buy a new one and it worked for a few days then the bucking rough idle came back. I swapped two of the cops around to check and it still had the same prob with #6. With the truck running I can unplug any of the other cop's and the idle gets worse, but when I pull the plug on #6 nothing changes. The plug is brand new, only thing I hanv't tried yet it to pull the plug just to double check the gap. Could I have bad wiring where it plugs up to the #6 cop? I have swapped it around 10 time and it stays with that cylinder.............. It's not a real bad idle just bad enough to **** me off

Finally pulled this plug like I should have done to begin with. Brand new 8 dollar plug was busted, the white was touching the metal piece. Gonna have to go get it swapped out for a new one.

 

well, got all the plugs changed out this evening. my god they put them in to tight. had to use a breaker bar for the rear four. But they all came out with no breakage and no following of the tsb. Guess I have such bad luck with everything else had some good with them not breaking. Changed out all the cop's minus the pass side front two. Hope that is the reason for rough idle still. Gonna get those changed out in the am and look everything over to make sure didn't miss a connection or something.

 

Got all the cop's changed out but still having a problem with a rough idel and sputtering on wot from a stop and in overdrive. Really getting tired of this......... Still having issues with the #6 cylinder. I had a broke plug in there to find out but put original plug in till tomm and still having the issue. Anyone know how to check for proper voltage and what not at the plug that goes onto the cop? I really thing I am getting a short or something like that. I hope it is just due to having 7 brand new plugs and one with 66,000 miles on it but with my luck it will be in the wiring..........

 

Since you have an 05 you need to check for stuck injector on the #6 cylinder heard you can pull the fule rail with the injectors pressurise the system to see if it leaks. 05 5.4 injectors are very prone to fail. Ford extented warnty on them and any damage they cuase to 11 years 120000 miles maybe this repair is a freebe from Ford.

 

get the injector looked at, cause i had a problem with this on cylinder 5 replace all spark plugs ran ok for awhile then the coil pack and it ran for a week then i just replaced the injector and all seems to be fine now

 

Thanks for the heads up on the injectors. Ended up just being the 7 new plugs didnt like the old plug I had to use till the parts store got the new one in. Once I got it put in and everything buttoned up runs strong and idles just right now. Anyone know how much time a shop charges for a sparkplug job on our trucks. Now that I have done it one time i believe it could be done in under 2 hours if none break. Probably could do it in under 1 1/2. Pretty simple to do if you take the upper airbox off the intake, makes for getting to # 3 and 4 fairly simple. Number 3 turned out to be harder to get to than 4. Oh well live and learn, just glad it is over with.

 

when I replaced my plugs I pulled the PCM & mounting bracket made a big differance in getting to the back plugs.

 

yeah, I looked at doing that but went ahead and went to town at getting them out with just the intake upper off. Would be easy and make whole lots more room though.

 

Do you have a 5.4 with an injector problem? If you do you read this letter.

http://www.justanswer.com/uploads/ti...call_07M08.pdf