Passenger side spark plug hole ,rear. wont let socket go all the way down to grab spak plug 2000 ford v10

I discovered the REAR coil & spark plug on the passenger side somehow was full of water. It seems its a common trend in the 5.4 and the V10 that the rear plugs and/or the coil over plugs go bad because of water dripping in from the cowel.

After purchasing your new coils and plugs it is a simple job, Its just very Time comsuming it get the plugs removed and replaced. you should be able to figure it out quickly. ALSO new coils come with a new boot.

be very carefull dont drop noting into the spark hole

You'll need to take off the top cover, 4 10mm bolts. You'll have to unplug and unbolt the 8mm bolt on each coil pack. Pull up the coil pack and plug boot. Each plug is down in the head, you'll need a 5/8" socket 6 inch extension and a ratchet, also an extend-able magnet is helpful. On some these motors you need to remove the fuel rail. The rear, passenger side plug is very difficult to get to.

Each coil mounts on top of the spark plug and is bolted down to the intake manifold with a 8mm bolt. You'll need to unplug the electrical connector to the coil, remove the 8mm bolt and pull the coil and boot up off the plug and out of the motor. You'll need a 5/8 inch spark plug socket, a ratchet and a 6 inch extension. Also a telescoping magnet with help getting the plug up out of the hole.

The #8 coil and spark plug are located on the drivers side rear of the engine. You will need a 7mm socket to remove the bolt that holds the coil down. After the bolt is out, pull the coil upwards and remove. Next you will need a 9/16" spark plug socket to remove the spark plug which is located in the hole that the coil came out of. The spark plugs in a 5.4L engine are sometimes frozen into the engine. If it is very hard to turn the plug, try spraying some WD-40 down the hole onto the plug and let it soak in for a while. Do not try to force the plug to turn, it will break and a special plug extractor will be needed to remove it.
Hope this helps you!

A very common proplem with this engine is the coil packs sit on top of the spark plugs with a approx 4 inch boot to the spark plug. Especially when there is wet weather moisture will get the the spark plug hole and when the vehicle gets up to temp the moisture will atomize and ground out the spark plug. Sometimes it will not even need to get hot and once it starts missing won't go away.
You will need to run a scan to determine which hole is misfiring. Then disconnect that coil and remove the one small bolt retaining itand pull it up out of the hole. Then take compressed air and blow out the bottom of the hole to dry it out. Re-install coil and your problem should have gone away. If you have a scanner sometimes just clearing the codes and the miss will go away. Be careful taking it to a shop as most shops will just sell you with the fact that you have a bad coil and have it fixed in the process of selling you and installing a new coil of hey maybe they will just blow it out and seeing as it's fixed you now buy into the fact that they replaced a "bad coil". That is not to say that sometimes it is just a bad coil and nothing else will fix it.
v8 triton is the same motor as the v10 with just 2 more cylinders so v10 or 5.4 same thing will apply.

check for spark at spark plug first. remove a plug and leave the wire on, hold it against block. crank engine & see if plug sparks. also, listen for air pressure in spark plug hole. report back.

use a 3/8 drive socket set with a longer extension

Quick Tip. Take one old spark plug and saw an X across the threads on the bottom with your hacksaw. Clean away the filings. Oil it and thread it into the spark plug hole. This is called re tapping. Then try the new plug again. Has worked many times for me.