Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLINCOLN2007MKZ FWD V6-3.5L VIN TREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIR
2007 Lincoln MKZ FWD V6-3.5L VIN T
Spark Plug: Service and Repair
2007 Lincoln MKZ FWD V6-3.5L VIN TSECTION Service and Repair
SPARK PLUGS
Exploded View
Removal
Both sides
1. Disconnect the battery ground cable.
LH side
2. Disconnect the crankcase vent tube quick connect coupling from the valve cover fitting and position aside.
RH side
3. NOTE: The upper intake manifold must be removed to access the RH spark plugs.
Remove the upper intake manifold.
Both sides
4. Disconnect the 6 ignition coil-on-plug electrical connectors.
5. NOTE: When removing the ignition coil-on-plugs, a slight twisting motion will break the seal and ease removal.
Remove the 6 bolts and the 6 ignition coil-on-plugs.
6. NOTE: Use compressed air to remove any foreign material in the spark plug well before removing the spark plugs.
Remove the 6 spark plugs.
Installation
Both sides
1. Inspect the 6 spark plugs.
2. Adjust the spark plug gap as necessary.
3. Install the 6 spark plugs.
- Tighten to 15 Nm (11 lb-ft).
4. NOTE: Apply a small amount of dielectric grease to the inside of the ignition coil-on-plug boots before attaching to the spark plugs.
Install the 6 ignition coil-on-plugs and the 6 bolts.
- Tighten to 6 Nm (53 lb-in).
5. Connect the 6 ignition coil-on-plug electrical connectors.
RH side
6. Install the upper intake manifold.
LH side
7. Position and connect the crankcase vent tube quick connect coupling to the valve cover fitting.
Both sides
8. Connect the battery ground cable.
Exploded View
Removal
Both sides
1. Disconnect the battery ground cable.
LH side
2. Disconnect the crankcase vent tube quick connect coupling from the valve cover fitting and position aside.
RH side
3. NOTE: The upper intake manifold must be removed to access the RH spark plugs.
Remove the upper intake manifold.
Both sides
4. Disconnect the 6 ignition coil-on-plug electrical connectors.
5. NOTE: When removing the ignition coil-on-plugs, a slight twisting motion will break the seal and ease removal.
Remove the 6 bolts and the 6 ignition coil-on-plugs.
6. NOTE: Use compressed air to remove any foreign material in the spark plug well before removing the spark plugs.
Remove the 6 spark plugs.
Installation
Both sides
1. Inspect the 6 spark plugs.
2. Adjust the spark plug gap as necessary.
3. Install the 6 spark plugs.
- Tighten to 15 Nm (11 lb-ft).
4. NOTE: Apply a small amount of dielectric grease to the inside of the ignition coil-on-plug boots before attaching to the spark plugs.
Install the 6 ignition coil-on-plugs and the 6 bolts.
- Tighten to 6 Nm (53 lb-in).
5. Connect the 6 ignition coil-on-plug electrical connectors.
RH side
6. Install the upper intake manifold.
LH side
7. Position and connect the crankcase vent tube quick connect coupling to the valve cover fitting.
Both sides
8. Connect the battery ground cable.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.