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A worm spark plug can cause you big time; avoid these expensive repairs by replacing them every 30,000 miles. Turn off the engine and let it cool before getting to work. Pull the hood release lever, located under the dashboard. At the front of the car reach under the hood, squeeze the latch to open. Located in a row along the engine and attached to thick wires the plugs are screwed directly into the engine, one per cylinder.
Look for the indentation along the engine starter. Each wire connects a specific plug to a specific wire, so always change the spark plugs one by one, as follows. Pull the L-shaped rubber boot that is attached to the plug wire to uncover the spark plug's terminal. Wipe off any dirt from around the plug. Fit a ratchet wrench to the socket, fitting squarely over the head of the spark plug. You may need an extension for your ratchet, if the spark plugs are deep set, or hard to reach.
A ratchet with a flexible head can come especially in handy. Work close to the core as yanking from higher can damage the spark plug and cause it to separate. Turn counterclockwise to loosen, then pull the plug out of the engine block. Decide whether or not to replace the spark plug. A healthy tip looks grayish or tan. Heavy deposits or a black appearance signal an engine problem. Any signs of physical damage to the electrode or core nose also means the spark plug needs to be replaced. But first you need to gap the new spark plug.
Refer to your car's repair manual for gap size information. Insert spark plug gapping tool in the gap between the metal center electrodes in the metal side electrode of the plug's tip. Look at the tool's rules edge to read the measurement. If the gap is too large tap down on one side the electrode with the tool to widen it. If it is too small, bend the side electrode up slightly with the gapping tool.
Repeat for each plug. Hand tightens the new spark plugs into place. Complete the process using the socket and ratchet wrench. Under tightening the plug may lead to engine damage and over tightening it can strip the threads on both the plug and cylinder. Get the plugs snug, without locking them. Replace the spark plug wire firmly. Start the ignition and listen. If it sounds rough, turn it off; let it cool and double check that the wires are well pushed onto the new plugs. Otherwise, you are finished.
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