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 MANUALSPONTIAC1998FIREBIRD V8-5.7L VIN GREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIRSPARK PLUG REPLACEMENT
1998 Pontiac Firebird V8-5.7L VIN G
Spark Plug Replacement
1998 Pontiac Firebird V8-5.7L VIN GSECTION Spark Plug Replacement
REMOVAL PROCEDURE
1. Remove the spark plug wires.
2. Remove the heated oxygen sensor from the right oxidation catalytic converter.
3. Loosen each spark plug one or two turns.
4. Brush or air blast away any dirt from around the spark plugs.
5. Remove the spark plugs one at a time and place each plug in a tray marked with the corresponding cylinder numbers.
INSTALLATION PROCEDURE
1. Properly position each spark plug washer.
2. Inspect each spark plug gap. Adjust each plug as needed.
Specification
Spark plug gap: 1.524 mm (0.060 in).
3. Hand start the spark plugs in the corresponding cylinders.
4. Tighten the spark plugs.
NOTE: Refer to Fastener Notice in Cautions and Notices.
Tighten
Tighten the spark plugs to 20 N.m(15 lb ft).
5. Install the heated oxygen sensor to the right oxidation catalytic converter.
Tighten
Tighten the heated oxygen sensor to 42 N.m (31 lb ft).
6. Install the spark plug wires
1. Remove the spark plug wires.
2. Remove the heated oxygen sensor from the right oxidation catalytic converter.
3. Loosen each spark plug one or two turns.
4. Brush or air blast away any dirt from around the spark plugs.
5. Remove the spark plugs one at a time and place each plug in a tray marked with the corresponding cylinder numbers.
INSTALLATION PROCEDURE
1. Properly position each spark plug washer.
2. Inspect each spark plug gap. Adjust each plug as needed.
Specification
Spark plug gap: 1.524 mm (0.060 in).
3. Hand start the spark plugs in the corresponding cylinders.
4. Tighten the spark plugs.
NOTE: Refer to Fastener Notice in Cautions and Notices.
Tighten
Tighten the spark plugs to 20 N.m(15 lb ft).
5. Install the heated oxygen sensor to the right oxidation catalytic converter.
Tighten
Tighten the heated oxygen sensor to 42 N.m (31 lb ft).
6. Install 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.