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How to Replace Spark Plugs in a Pontiac Grand Prix

by Contributor

The spark plugs in a Pontiac Grand Prix are built to last up to 100,00 miles. Old or damaged spark plugs drastically reduce the life of Grand Prix engines. Changing spark plugs on a Grand Prix takes about 30 minutes to complete and helps improve the vehicle's gas mileage.

Step 1

Park the Grand Prix and allow the engine to cool. The time it takes to cool the engine depends on climate, temperature and how long it was last driven.

Step 2

Locate the spark plug wires, which are halfway down the sides of the Grand Prix engine.

Step 3

Grab the spark plug wire by the boot and twist it to release the lock. Pull back to remove the wire from the spark plug. Replace one spark plug at a time. Spark plug wires that are crossed or put into the wrong place cause major cylinder and engine damage.

Step 4

Unscrew and remove the old spark plug with the socket and wrench.

Step 5

Lubricate the threads of the new spark plug and the wire's boot with anti-seize compound.

Step 6

Screw in the new spark plug by hand and test its tension. The tension on Grand Prix spark plugs needs to be between 11 and 15 ft-lbs. Adjust the spark plug accordingly.

Step 7

Replace the spark plug wire. Turn it 1/2 turn in both directions until you hear it click in place.

Repeat Steps 2 through 7 for the remaining spark plugs.

Items you will need

  • Spark plug socket
  • Socket wrench and extension
  • Anti-seize compound
  • New spark plugs
  • Tension tester tool

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