AnthemMike
Well-known member
- Thread starter
- #1
Just wanted to throw a little thread together for people who may not know how to do a spark plug change.
F-150 2.7L, 4WD XLT Sport SCREW. Truck has 55k on the odometer. All the spark plugs were out of spec at .032" or greater. I noticed a little bit of a drop in MPG and an occasional rough idle. So I pulled them and put new ones in. Spark Plug part numbers are SP-594 (CYFS-12Y-RT3). Took me about 45 minutes to do.
The back two cylinders will be a pain especially driver side due to the wiring harness.
The tools you'll need are 3/8 drive ratchet with a 9" extension (worked for all the cylinders, a lot of people use a 6" and add a 3"), 5/8 spark plug socket, feeler gauges to double check new spark plugs for appropriate gap, dielectric grease for the coil packs/boots, 1/4 drive ratchet with 4" extension, 8mm socket, torque wrench (7.2 - 14.4 ft-lb), flat head to help get the wire loom off the boot studs, pliers for back cylinder wire loom over to help get off the boot stud.
1. Release coil pack/boot electrical connector.
2. Remove wire loom off the stud.
3. Pull the stud off the boot (8mm).
4. Remove coil pack/boot, then take compressed air and blow out where the spark plug seats before you remove it to prevent debris falling in cylinder.
5. Remove spark plug with 5/8 spark plug socket (do not use a regular 5/8 socket).
6. Put some dielectric grease in the end of the boot (check for cracks/damage).
7. Install new spark plug with 5/8 drive socket and torque to correct spec.
8. Re-install boot.
9. Re-install stud.
10. Re-install wire loom and connectors to boot.
11. Done and enjoy a Miller High Life.
Unfortunately I didn't take any photos (theres a few videos on YouTube for people if needed). But it's a pretty easy job for anyone to tackle and save money from what a stealership would charge you.
F-150 2.7L, 4WD XLT Sport SCREW. Truck has 55k on the odometer. All the spark plugs were out of spec at .032" or greater. I noticed a little bit of a drop in MPG and an occasional rough idle. So I pulled them and put new ones in. Spark Plug part numbers are SP-594 (CYFS-12Y-RT3). Took me about 45 minutes to do.
The back two cylinders will be a pain especially driver side due to the wiring harness.
The tools you'll need are 3/8 drive ratchet with a 9" extension (worked for all the cylinders, a lot of people use a 6" and add a 3"), 5/8 spark plug socket, feeler gauges to double check new spark plugs for appropriate gap, dielectric grease for the coil packs/boots, 1/4 drive ratchet with 4" extension, 8mm socket, torque wrench (7.2 - 14.4 ft-lb), flat head to help get the wire loom off the boot studs, pliers for back cylinder wire loom over to help get off the boot stud.
1. Release coil pack/boot electrical connector.
2. Remove wire loom off the stud.
3. Pull the stud off the boot (8mm).
4. Remove coil pack/boot, then take compressed air and blow out where the spark plug seats before you remove it to prevent debris falling in cylinder.
5. Remove spark plug with 5/8 spark plug socket (do not use a regular 5/8 socket).
6. Put some dielectric grease in the end of the boot (check for cracks/damage).
7. Install new spark plug with 5/8 drive socket and torque to correct spec.
8. Re-install boot.
9. Re-install stud.
10. Re-install wire loom and connectors to boot.
11. Done and enjoy a Miller High Life.
Unfortunately I didn't take any photos (theres a few videos on YouTube for people if needed). But it's a pretty easy job for anyone to tackle and save money from what a stealership would charge you.
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