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 MANUALSCHEVROLET1997ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIR
1997 Chevrolet Astro Van 2WD V6-4.3L VIN W
Spark Plug: Service and Repair
1997 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Service and Repair
TOOL REQUIRED:
J 39358 Socket, Spark Plug.
SERVICE PRECAUTIONS:
^ Allow the engine to cool before removing the spark plugs. Attempting to remove the plugs from a hot engine may cause the plug to seize, causing damage to the cylinder head threads.
^ Clean the spark plug recess area before removing the plug. Failure to do so can result in engine damage due to dirt or foreign material entering the cylinder head or contamination of the cylinder head threads. Contaminated threads may prevent proper seating of a new plug.
^ Do not install plugs that are either "hotter" or "colder" than the heat range specified. Using plugs of the wrong heat range can severely damage the engine.
REMOVE OR DISCONNECT
Make sure the ignition switch is "OFF."
NOTE: Twist the spark plug boot one-half turn to release it. Pull on the spark plug boot only. Do not pull on the wire or the spark plug lead may be damaged.
1. Spark plug wires and boots. Label the plug wires.
NOTE: Be sure to use J 39358 spark plug socket or equivalent. Failure to do so could cause cracking of the Insulator and arcing In side the plug, resulting In engine misfire.
2. Spark plugs using J 39358 or equivalent.
INSPECT
Each plug for wear and gap.
INSTALL OR CONNECT
NOTE: Make sure each spark plug threads smoothly into the cylinder head and is fully seated. Cross-threading or falling to fully seat spark plugs can cause overheating of the plugs, exhaust blow-by, or thread damage.
1. Spark plugs. Tighten spark plugs to 30 Nm (22 lb. ft.) in a new cylinder head and 20 Nm (14 lb. ft.) in a used head.
2. Wire and boot assemblies.
J 39358 Socket, Spark Plug.
SERVICE PRECAUTIONS:
^ Allow the engine to cool before removing the spark plugs. Attempting to remove the plugs from a hot engine may cause the plug to seize, causing damage to the cylinder head threads.
^ Clean the spark plug recess area before removing the plug. Failure to do so can result in engine damage due to dirt or foreign material entering the cylinder head or contamination of the cylinder head threads. Contaminated threads may prevent proper seating of a new plug.
^ Do not install plugs that are either "hotter" or "colder" than the heat range specified. Using plugs of the wrong heat range can severely damage the engine.
REMOVE OR DISCONNECT
Make sure the ignition switch is "OFF."
NOTE: Twist the spark plug boot one-half turn to release it. Pull on the spark plug boot only. Do not pull on the wire or the spark plug lead may be damaged.
1. Spark plug wires and boots. Label the plug wires.
NOTE: Be sure to use J 39358 spark plug socket or equivalent. Failure to do so could cause cracking of the Insulator and arcing In side the plug, resulting In engine misfire.
2. Spark plugs using J 39358 or equivalent.
INSPECT
Each plug for wear and gap.
INSTALL OR CONNECT
NOTE: Make sure each spark plug threads smoothly into the cylinder head and is fully seated. Cross-threading or falling to fully seat spark plugs can cause overheating of the plugs, exhaust blow-by, or thread damage.
1. Spark plugs. Tighten spark plugs to 30 Nm (22 lb. ft.) in a new cylinder head and 20 Nm (14 lb. ft.) in a used head.
2. Wire and boot assemblies.
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.