GM 5613935 Spark Plug

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.

Ensure that the spark plug wire is correctly routed away from the hot exhaust manifold.

The spark plug gap should be set correctly using a feeler gauge.

The gap should match the Specifications or Tune-up decal values, with the wire gently touching both electrodes. Use the notched adjuster on the feeler gauge to correct any gap discrepancies.

Properly functioning spark plugs are essential for the engine to perform optimally.

Allow the engine to cool and cover the car's fenders to protect the paint. Carefully remove one spark plug wire using a twisting motion and blow away debris from the spark plug area to prevent foreign material from entering the cylinder.