Heishman

That is how they all come.
Posts #489 to #493 of this thread.

Bills96TA

Good to know, still bugs me though and I am going to put a bolt in it to make me feel better.

engineermike

I'm pretty sure there is no hole in the manifold to thread it in to.

gwpfan

You could cut a bolt and glue it on so it looks like it's there!

NASSTY

engineermike

Metric or imperial thread?

jimvoll

I have a 2011 with 82000 miles on it. Had a very bad misfire with any more that about 20% throttle. Of the line to about 30 mph fine then started to shutter, add throttle and misfire and shaking. More throttle more misfires, poured out black smoke, cec flashing, no limp mode.

New plugs installed XP53363 gapped to 32. Old plugs were gapped to 42 - 45.

No more misfires or lack of power, pulls strong idles smooth. will update on fuel economy.

HCFX2013

My MPG has gone up from 15.8 mpg avg to 16.2 mpg since I gapped the plugs. Idle sounds a hell of a lot smoother! Doesn't have DI ping as bad when idling. I've also noticed that when coming off the throttle then immediately lightly giving it more I used to hear and feel a hollow series of "pops" and feel a slight hesitation. That's gone. Very happy with the results!

XFJunkie

I may have missed it but what are the spark plug part numbers we use?

CoreyMS

The old motorcraft number is sp-528, new is sp-534. Sp-534 comes gapped .30 in box.