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 MANUALSSUBARU1990XT-6 4WD L6-2.7L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIR
1990 Subaru XT-6 4WD L6-2.7L SOHC
Spark Plug: Service and Repair
1990 Subaru XT-6 4WD L6-2.7L SOHCSECTION Service and Repair
REMOVAL
1. Twist and pull to remove ignition wire from plug.
2. While wearing saftey glases, use compressed air to blow out debris from plug well.
3. Using a 5/8" (16mm) socket, remove plug.
INSTALLATION
1. Adjust electrode gap to 0.039 - 0.043 in (1.0 - 1.1 mm).
2. Lightly coat threads of plug with anti-seize compound.
3. Install and thread plug into cylinder head by hand.
4. Torque spark plug to 13 - 17 ft.lb (18 - 24 Nm).
5. Apply dielectric compound to the inside of ignition wire boot and install. A slight click will be heard when wire is properly connected.
RECOMMENDED SPARK PLUGS
BRAND PART NO.
---------------------------------
NGK BPR6ES-11
NIPPONDENSO W20EPR-U11
CHAMPION RC9YC-4
1. Twist and pull to remove ignition wire from plug.
2. While wearing saftey glases, use compressed air to blow out debris from plug well.
3. Using a 5/8" (16mm) socket, remove plug.
INSTALLATION
1. Adjust electrode gap to 0.039 - 0.043 in (1.0 - 1.1 mm).
2. Lightly coat threads of plug with anti-seize compound.
3. Install and thread plug into cylinder head by hand.
4. Torque spark plug to 13 - 17 ft.lb (18 - 24 Nm).
5. Apply dielectric compound to the inside of ignition wire boot and install. A slight click will be heard when wire is properly connected.
RECOMMENDED SPARK PLUGS
BRAND PART NO.
---------------------------------
NGK BPR6ES-11
NIPPONDENSO W20EPR-U11
CHAMPION RC9YC-4
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.