This is what you need.
Amazon.com: Water Bottle Cleaning Brush: Kitchen & Dining
Maybe you can even get it into a small drill to spin it a bit faster than by hand.

 

Wow, Momma's 2000 EB Expedition has 135,000 on it's original plugs and still runs great. Not so sure I wanna screw it up by replacing the plugs after reading this thread.

 

Well, I shoulda followed up with my conclusion, as it may help you.

I used an eyeliner brush (stole from wife) connected to a 1/4" tube to the 2" vaccum tubing using a bunch of reducers (plumbing adapters from hardware store). And I used a coat hanger wire for strength from the brush up the tube about 12" - duct tape was my friend. It worked great. I then took the brush off and just shoved the tube down into the cylinder. I vaccumed all kinds of crap out of each cylinder.

I used antiseeze on the threads and 13 ft-lb setting on torque wrench (actually, 155 in-lb on my small wrench). Put the coils back on, fired it up. Check engine light gone. The thing runs excellent. I even got bulish right away, pedal to the floor to really stress the engine and prove out the work.

Conclusion: 100% success changing the plugs.

...and in fact, I now get better gas milage WITH my trailer on than I was without it before doing this. It's just insane.

At 135k, I highly recomend changing the plugs. It is not long before they crap out, and they are probably causing sucky internal perf even now, despite your comments about running great.

 

Great tips for changing spark plugs and bit late for me..... I just did mine last week on 2000 Nav 5.4L and it went alot easier for me than i thought....and i used extentions to work with it...

1- On driver side i did it all without removing anything except plate covering coil.....
2- On passenger side, i removed the big black electric connection box which is attached with firewall to access the back two plug and off course the plate covering the plugs.......

Passenger side went quicker than i driver side and off course anti-seize, spark plug gap and electric grease inside the coil boots....

 

I do all the wrenching on all types of stuff. I have had lots of Fords over the years. I've had lots of other American and foreign cars too. I only have 1 Triton motor though and it's in my wife's Expedition.

Changed the plugs today for the first time. 130K and the plugs still looked good. Car still ran great. Runs better with the new plugs I will admit.

BUT... I gotta say that some Ford engineer needs to be kicked in the nuts for screwing up most of my Saturday though. That was a pain in the butt changing those plugs.

 

Friend of mine bought a nice 99 navigator, popped the hood and looked for the plugs (which I never found).......I can see this going to be fun. Cutting my leg off with a chain saw and hopping around the yard yelling mommy sounds easier...

 

Hopefully it won't turn out as bad as my story.

I changed the plugs. Ran great like always just idled a little smoother for a couple days. Then it started to miss badly. Turned out at least one of the coils was going bad. Replaced them all ($$$) with Borg-Warner's and it ran great from San Diego to Odessa, TX.

3 weeks in Odessa and my daughter tells me car runs like crap and the SES light's on

Did a full on maintenance routine on this truck 1 week before she left. I drove it a week around town so I would be certain it was good-to-go for her

Hard for me to fix whatever it is this time a thousand miles away. Anyone know a place better than Sewell Ford to take it in Odessa, TX????

 

At least have get it scanned to see what the code is. It could be something that you can talk her through, bad gas, or even a loose gas cap.

 

Good advice except we are talking about an 18yo girl with no tools (mechanics tools that is).

I checked out Sewell Ford that's right close off the UTPB campus. A+ BBB rating since 1980. Only 1 complaint received about their service department in the last 3 years. Complainer refused to acknowledge BBB's requests for verification of problem or resolution so I'll discount that complaint as some people just can't be pleased.

Fingers crossed, we shall see what they find for codes next week. I'm guessing one of the new coils failed. Hopefully I'm wrong and it's something cheaper

 

Perhaps one of the auto parts stores will scan it for free like Autozone does. She doesn't have to do anything except drive it there and ask them to scan it.

As for the coil, mail one down to her ($5 USPS priority mail) just in case. At least you won't have to pay $150 for the part from the dealer if it does turn out to be one of the new COPs.

 

Update:

Sewell Ford in Odessa just called. They say 2 of the 8 brand new (1,500 miles) Coil-on-plug(s) failed. $439 and some change for diagnosis and repair. If that fixes it I will be happy to get it done.

FYI the coils I bought are Borg Warner sold under the name BWD. I guess I should have ponied up for the Motorcraft's

I will return those for refund and hope the others don't fail.

 

There is a lot of good info in these threads, but be careful.
As I found out, there are at least 3 versions of the 5.4, some have different spark plug "issues" due to the different heads.
Apparently some of the earlier 2V heads had problems with blowing out the plugs.
The 3V heads (started in 05 model year for the Expy) have that 3-pc plug that can come apart (Not sure when/if Ford solved this).
I think that there are 4V heads on the Navigators.
There are several threads here regarding the issues and solutions, so be informed.

 

Questin 1.
Would these instructions work on my Expedition 2003? I know I have a 5.4L engine.

Question 2.
The car(truck?) is riding rough again. It was doing this approxmiately 6 months ago and the issue went away. No check engine light comes on. Is there a way to check which one may be causing the issue? Thanks!