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 MANUALSFORD1999F 150 2WD PICKUP V6-4.2L VIN 2REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIR
1999 Ford F 150 2WD Pickup V6-4.2L VIN 2
Spark Plug: Service and Repair
1999 Ford F 150 2WD Pickup V6-4.2L VIN 2SECTION Service and Repair
Spark Plug Wire Remover:
Special Tool(s)
REMOVAL
1. Use Spark Plug Wire Remover to pull the ignition wires off the spark plugs.
NOTE
^ Use compressed air to remove any debris from the spark plug well before removing the spark plugs.
^ If an original spark plug is reused, make sure it is placed in the same cylinder it was taken from. Replacement spark plugs can be used in any cylinder.
2. Remove the RH spark plugs.
3. Remove the LH spark plugs.
4. Inspect the spark plugs:
Item Description
1 Deposits Bridging Spark Plug Gap
2 Wet Black Deposits (Oil Fouling)
3 Dry Black Deposits (Carbon Fouling)
4 Normal Spark Plug
5 Pre-Ignition
6 Overheating
7 Fused Spot Deposits
INSTALLATION
1. Apply Silicone Brake Caliper Grease and Dielectric Compound D7AZ-19A331-A or equivalent meeting Ford specification ESE-M1C171A to the inside of the spark plug wire boots.
2. Adjust the spark plug gap as required.
NOTE: If an original spark plug is reused, make sure it is placed in the same cylinder it was taken from. Replacement spark plugs can be used in any cylinder.
3. Install the LH spark plugs.
4. Install the RH spark plugs.
5. Connect the spark plug wires.
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.