GM 5613680 Plug,Glow

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Properly functioning spark plugs are essential for the engine to perform optimally. It is recommended to replace the spark plugs with new ones at the specified intervals mentioned in Routine Maintenance or the owner's manual. When replacing the spark plugs, it is important to use new ones of the same heat range and type, which can be identified by the series of numbers and letters stamped on them. The spark plug gap plays a crucial role in the efficiency of the spark, so it should be set correctly using a feeler gauge. The condition and appearance of the spark plugs provide valuable information about the engine's tune and condition. A clean and white insulator nose indicates a weak mixture or a hot plug, while hard, black-looking deposits suggest a rich mixture. A black and oily plug may indicate engine wear and a rich mixture. Light tan to greyish brown deposits on the insulator nose indicate a correct mixture and a well-maintained engine. If there are long, brown, tapering stains on the outside of the white portion of the plug, it indicates a faulty joint and requires replacement. Always tighten the spark plug to the specified torque, avoiding excessive tightening.

The spark plug gap defines the distance between the electrodes and serves as the point where the electrical current can arc.

Spark plug replacement is typically needed every 20,000-30,000 miles.

Hard, black-looking deposits suggest a rich mixture.

Replace them one at a time to prevent any mix-up of the spark plug wires.

The spark plugs should be replaced one at a time to prevent wire mix-up. Repeat the steps mentioned earlier for each spark plug.

Replace them one at a time to prevent any mix-up of the spark plug wires.

Ensure the engine cools down, inspect and adjust the gap on each new spark plug, and check for any defects. Also, protect the car's exterior paint with fender covers.