Nearing 100K miles on my 2005 STX 4.6L, got some Motorcraft plugs but I was wondering if I should change the COPs too. Motorcraft COPs are quite expensive if I am reading it correctly, like almost $40 each so that would be $320 for a set. Reading about counterfeit Motorcraft parts so a bit paranoid about ordering, Amazon and Rockauto have them from the $40 each price then Amazon has sets of 8 with plugs for less than $100 but I can't find sets of just the Motorcraft COPs. Have any forum guys had any luck with aftermarket units? Some of those are better priced and some are advertised as high performance, which I really don't need with a 4.6L. I do have an Edge Evo programmer so have the ability to adjust the timing, etc. if I did go with a high performance unit. Any input would be appreciated, originals seem to be in good shape with no issues but wanted to change plugs before I hit 100K so thought I would see if I should be looking at other maintenance while I am in there.

 

Only replace cops when needed. They do make boot kits you can get but I wouldn't waste my $$.

 

Nah, no need to change coil packs.

Just plugs and boots. Omit boots if you want. However if you experience misfire's in the near future you'll have to pull coils to then change the $4 boots.

 

For $32 for the boots, I would change them, do it once and possibly save a coil or two should misfiring start occuring.

 

The boots on the 66,000 mile motor I pulled looked good. However, my eyes may not be as good as they were as a younger person. It's difficult for me to pick up on some detail, especially picking up a small crack in a black boot.

I did inspect a few of them really closely and they did look great, no signs of any carbon tracking or splitting.
The California environment the truck originated from (I purchased from the same place it was originally sold at) isn't horrible -we've pretty much only got heat to contend with.

Not worth my time to go back into the job and chase a single misfire location after the fact. 4-bucks is expensive for a boot but overall is cheap considering the headaches in the future that MAY result (or may never).

Depends too on how meticulous a person is. To change a boot, does one really want to wipe down the top of the motor of debris. Clear the hole after removing the coil then reinstall? Not hard, but is more steps and takes longer than 5 minutes to clean up and prepare.

No answer is right.