OEM 2003 Lincoln Navigator Spark Plug

2003 Lincoln Navigator Spark Plug Parts Questions & Experts Answers

• Q: How to service a spark plug on 2003 Lincoln Navigator?

  A: The first step for spark plug servicing includes removing the ignition coil and cleaning spark plug wells from all foreign materials using compressed air prior to spark plug removal. Test the spark plugs to verify electrode gaps remain open while examining for deposit buildup that blocks gaps between electrodes and analyze whether oil or carbon fouling is the cause; when necessary clean the spark plug. The spark plug replacement requires inspecting bore electrode insulator shell deposits for oil marks as a sign of excessive oil entry. Worn rings and pistons along with valve-guide clearances or bearing looseness should be fixed before new spark plug installation. The presence of black fluffy carbon deposits should be checked on the insulator tips and exposed shell surfaces and electrodes because these deposits signify an incorrect heat range or a dirty air filter or rich fuel mixture or excessive idling. If present, clean the spark plug. The inspection of normal burning should reveal light tan or gray deposits on the firing tip while pre-ignition signs include melted electrodes and possibly damaged insulators with engine damage indicators from incorrect ignition timing or wrong fuel type or improper heli-coil installation in spark plug threads and requires spark plug replacement when present. Verify electrode conditions by examining white and light-gray-brown spots with a bluish-burnt appearance because engine overheating, wrong fuel type, loose spark plugs, incorrect heat range, low fuel pump pressure, or incorrect ignition timing could be the cause; install a fresh spark plug if overheating affects your engine. Verify the presence of fused deposits through melted or bubbly spots or blisters which develop during abrupt acceleration then perform necessary spark plug cleaning. The installation process includes reversing the removal method while carefully adjusting the spark plug gap before installation.