I have a 2001 ford f150 supercrew with the 5.4 v8. The truck has 155K miles on it. Here in the last week the truck was running rough, so since it has a big lift and tires on it i figgured my tires was out of balance, so i had that done and still not change. Then a few days later i was comming home and my check engine light came on so i have a code reader and pulled the code it is p0301. I understand that it is a misfire in cylinder one. Where should i start on replacing parts? Someone also told me that maybe it could be a fuse that powers the injector? Or some kind of sensor to the injector? All help appreciated

 

Start with a new spark plug, if that doesn't fix it, swap the COP with another cylinder and see if the missing cylinder changes.

If you haven't changed the spark plugs in the last 60k or you don't have Motorcraft plugs in it, change them all.

 

Check your fuel filter as well. Since #1 is furthest from the pump.

 

k thanks guys, what exactlly is the cop?

 

I am sure the plugs need to be changed i havent had them changed since i have had the truck but i have only have had the truck for 30k miles, who has the best prices on the motorcraft plugs?

 

COP = Coil On Plug.

You can order Motorcraft plugs from Rock Auto for $2.54 each plus shipping. They are $3.49 at Autozone. Part number is SP-479, do NOT use antiseize, and torque them to 28 ft/lb. COP's at the Ford dealer cost about 80 bucks each, you can get aftermarket cops at parts stores for about $40. However, you can buy a complete set of 8 OEM quality with lifetime warranty on Ebay for around $80. When removing and replacing plugs and COP's, make sure you use dielectric grease in the boots.

 

k thanks glc...i will try that and see what happens. For some reason my COP on the #1 cylinder will not get tight when i try to screw in that bolt..i figgured that was what was making it run bad..but i wedged a peice of wood in there to keep it tight but it must be a bad coil. So do you think it should replace all of the COP or just that one?

 

Yea, their not suppose to be tight, they ride on a bushing and must remain loose or they will crack and break lol.

Just lightly torque down to about 42" lbs - If it's not to late that is. Coils should move freely.

Or a little more than that -

 

k thats good to know now that i have wedged a peice of wood in there!!! lmao...i am just going to replace it, are the COPS cylinder specific when i go to buy one?

 

Nope. Buy a full set from Ebay.

 

http://cgi.ebay.com/ebaymotors/NEW-I...ht_2539wt_1165

 

these look pretty simple to change IMO i could be wrong tho

 

glc and I half *** explain it here lol -

https://www.f150online.com/forums/19...ow-misses.html

 

just had the same problem, turned out to be a bad plug.
I swapped injectors between 1 and 3.....no change in misfire code.
Then swapped COP's from 1 and 3...still no change in misfire code.
Then swapped the plugs and the misfire code swapped cylinders....bingo!!!!
Start with the easiest (and FREE) diagnosis first...

I had Autolite HT1 with less than 15,000 miles on them. Put in a set of Motorcraft and will never deviate.

 

I had a misfire in #5 and had to replace the cop (coil over plug)
ran great after that also put new plugs in when I had the fuel rails off and that help out a lot as well
AKFORD MAN