Have a 2004 f150 heritage and has a 4.6 and it's a 4 x4. Gonna change the plugs. It has the cop system. Never did one before. Need to know how. Anybody's help would be great. Has 198,000. Last changed by dealer about 99,000 ago. Thanks. George

 

You will soo each cop on top bolted down with what i beleive is an 8mm bolt if i rememberemember correct, disconnect battery, unplug each cop, unbolt and gently pull out, your plug will be down in the hole. I would recommend a couple squirts of wd 40 down there and let it sit for 30/mins or so. I beleive the plugs are a 5/8. Put those new plugs in and reverse order of removal. I would also check the cop condition and replace necessary peices. Use wd 40 for easier reinstall. preety basic stuff, nothing to be worried about! Have fun!

 

You will also need a couple extensions and swivel joints as well to reach cylinders 3 and 4 and 7 and 8. Not too bad of a job. Cylinders 4 and 8 are a bitch but it can be done.