You should replace the spark plugs in your Dodge Caliber at about 60,000 miles. The spark plug electrode wears over time due to a high amount of voltage arcing across the spark plug which causes the tip of the plug to erode. The high pressure and temperature that can be found in the engine cylinders puts a lot of strain on the spark plugs. Replacing the spark plugs may bring back some lost performance and may even boost your fuel mileage.
Open the Caliber's hood and prop it up.
Remove one coil at a time to access the spark plugs. The Dodge Caliber uses a coil-over-plug ignition system instead of a distributor. Each coil is held on by two bolts that can be removed with a ratchet. Turn in a counterclockwise direction and then pull the coil out once the bolts are removed.
Remove the spark plug with a ratchet. Attach a long extension and spark plug socket to the ratchet and turn counterclockwise.
Install the new spark plug in the cylinder and tighten using a normal socket (13/16 inch). A normal socket is necessary because a spark plug socket will grab onto the spark plug and get stuck in the cylinder.
Reinstall the coil on the spark plug and tighten the bolts with a ratchet.
Repeat Steps 2-5 for each plug, and then close the hood.
