OEM 2000 Lincoln Navigator Spark Plug

2000 Lincoln Navigator Spark Plug Parts Q&A

• Q: How to service and repair spark plugs on 2000 Lincoln Navigator?

  A: Start by removing the ignition coil before extracting the spark plugs while clearing all foreign matter from the wells through compressed air. Scanning the spark plugs shows bridge gaps between electrodes along with deposit collections that prevent electrode contact so clean the spark plug if necessary. An examination of the insulator shell bore electrodes for wet black deposits indicates oil fouling possibly caused by ring and piston wear or valve-to-guide clearance issues or worn loose bearings. Any oil leak issues should be resolved prior to new spark plug installation. Black dry and fluffy carbon deposits on the spark plug tip and shell exterior and electrodes indicate an incorrect heat range, filthy air filters or rich fuel mixture or engine idling for too long. Cleaning these carbon deposits may be required. Normal burning should be checked via inspection of light tan or gray deposits found on the firing tip. Several indicators of pre-ignition exist as melted spark plug electrodes combined with metal buildup on the insulator which needs immediate attention since they point to incorrect ignition timing or fuel type usage or heli-coil installation that requires replacing the spark plug. White or light gray-brown spots combined with a bluish-burnt electrode appearance must be checked because these symptoms indicate possible engine overheating or wrong fuel choice, loose spark plugs, improper heat range, insufficient fuel pump pressure or incorrect ignition timing. Replace the spark plug if overheating is detected. To avoid melted deposits that appear as bubbles and blisters during sudden acceleration perform an inspection followed by spark plug cleaning if necessary. The installment of spark plugs should follow the opposite order of removal while adjusting the plug gap according to specifications.