How do you replace a spark plug coil in a ford expedition?

Answer 1

I have a 1998 Ford Expedition, Eddie Bauer edition. Since this is the early version for most engines, follow the instructions & you'll be okay.

The hardest part is due to the fuel rails (polished tubing) underneath the 5.4L Triton Engine cowl plastic.

1. Unbolt and remove the cowl.

2. Remove the 2 bolts holding the polished duel rail tubing. (*Repeat this process for the opposite side or leave it alone and use the untouched side as an aid in assembly if you forget how it goes back together.*)

3. You will now have the coils exposed and you can begin your repairs. Each coil is held in place with a small 7mm bolt and take your time removing them due to their weak size.

4. Unplug each coil and then remove it carefully. The rubber can become stuck on the spark plugs and if this is the case, you can shatter the plug. ***Ford charges $100 per shattered plug, being slow and steady will pay off... literally.***

5. If you're changing the coils because they are causing the "check engine" light to appear, you should already have new plugs. (It is often overlooked, but when the coil goes bad, the plug is fouled by fuel and the bad coil packs' inability to properly fire. *Do not skip on the new plugs.*

6. Apply dielectric grease to the outside of the plug and to the top contact point of the plug to ensure the connection is made. The grease also waterproofs, prevents oxidation from interfering with proper firing, and will prevent the rubber from fusing to your plugs in the future.

7. Put your new plugs in with a ⅝" plug socket. It is a necessary socket and prevents you from dropping the plug in the head. Now, apply a very small dab of anti-sieze grease onto the plug threads and spread it from the first thread to the last in an effort to prevent grease from entering the motor. (Always spin your plugs to the left to find the first thread in the head. Once you feel the plug drop, that is where you will want to begin turning to the right, and tighten it lightly until you know it was seated properly. *Do not strip the threads in the head!*

8. Finally, mount your coil packs and replace the fuel rails. ***Be careful with these fuel rails, the injectors have a small o-ring that helps to seal them in the motor. Do not pinch, remove, or damage them!*** that will become hazardous near a faulty coil pack!**

You will need:

1. Anti-Size grease

2. Dielectric grease

3. ⅜" ratchet

4. ⅜" ratchet extensions (a variety sizes)

5. 7mm socket

6. ⅝" plug socket

7. 5/16" socket

8. 8 x *Platinum* Spark Plugs (The correct plug is PLATINUM. (Motorcraft or Bosch is the best I've used.)

9. 8 x Coil packs (The Accel brand is really good.)

10. Time and patience is mandatory.

Now your Eddie is ready and you'll feel like you're driving a brand new 5.4L Triton! If you've put this work off for a while, you'll instantly love your Expedition all over again. This repair also covers the 4.6L too... so don't feel left out.