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.
Spark Plug: Removal: 4.0L
On the 4.0L 6-cylinder engine the spark plugs are located below the coil rail assembly. To gain access to any/all spark plug(s), refer to COIL RAIL - 4.0L .
- Prior to removing the spark plug, spray compressed air around the spark plug hole and the area around the spark plug. This will help prevent foreign material from entering the combustion chamber.
- Remove the spark plug using a quality socket with a rubber or foam insert.
- Inspect the spark plug condition. See DIAGNOSIS AND TESTING - SPARK PLUG CONDITIONS .
Use the Manual With the Right Hardware
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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.
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