[Deuce]

I bought a 2002 F-150 Crew Cab a few weeks ago. It was a farm truck before I got it. I think I've washed off and or vacuumed out a couple acres of South Texas dirt from it.



It has a slight misfire at idle that I've been working on. I changed the IAC valve, fuel filter and I am in the process of changing the C.O.P.S. and plugs. The 4 plugs I already changed looked good. It's a 4.6 with a little over 133,000 on it. If what I'm doing now doesn't get rid of the misfire, I'm thinking new MAF and maybe the EGR valve. Any other suggestions?

 

[bullit4404]

When you do the spark plugs, check their colour. If any are dark or sooty, you may have a bad coil which is common on 4.6/5.4's. Clean the MAF carefully, and pull the EGR and look at it for crusty carbon, which you can clean. You can apply vacumn to see if it's working. Good luck.

 

[JackDW - 852]

Best to use factory plugs and coils. Some aftermarket just do not seem to play real well with the 4.6s. May cost a little more but worth it in the end.

 

[Deuce]

I've done 6 of the 8 plugs. All look to be in range. Motorcraft plugs and C.O.P.S., so that leads me to believe they were never changed. I broke off a stud holding one C.O.P. down, and that sucks, but I did a workaround, and it should be okay.



Thanks!