Spark Plug: Service and Repair

Spark Plugs

Removal
1 Disconnect the battery ground cable. For additional information, refer to Specifications Service and Repair
2 Remove the engine cover. For additional information, refer to Engine Cover - 4.0L Service and Repair
3
CAUTION: It is important to twist the spark plug wire boot while pulling upward to avoid possible damage to the spark plug wire.
NOTE:
Note the fitted position.
Disconnect the high tension (HT) electrical connectors.
4
WARNING: Eye protection must be worn.
NOTE:
Use compressed air to remove any foreign material from the spark plug wells.
Clean the area surrounding the spark plugs.




5 Remove the spark plugs.

Installation
1
CAUTION: Prior to fitting new copper spark plugs, check that the electrode gaps are set to 1.4 mm, adjust if necessary. Existing platinum or copper spark plugs must not be re-gapped in service; if the electrode gap is incorrect new spark plugs must be fitted.
NOTE:
Do not apply lubricant to the threads.
Install the spark plugs.
- Check the spark plug gap, refer to specifications.
- Tighten the spark plugs to 18 Nm (13 lb.ft).
2
CAUTION: Install spark plug wires to positions noted on removal. Do not cross wires.
Connect the HT electrical connectors.
- Apply silicone grease to inside of spark plug boot.
3 Install the engine cover. For additional information, refer to Engine Cover - 4.0L Service and Repair
4 Connect the battery ground cable. For additional information, refer to Specifications Service and Repair