OEM 2005 Lincoln Navigator Spark Plug

2005 Lincoln Navigator Spark Plug Parts Questions & Experts Answers

• Q: How to inspect a spark plug for issues such as bridged gaps, fouling, and overheating on 2005 Lincoln Navigator?

  A: A check should be done on the spark plug to confirm the gap is properly bridged because deposits from oil or carbon will block the electrodes. If necessary you should clean the spark plug. Check for oil fouling through black wet deposits on insulator shell bore electrodes which develop because of excessive oil penetration in the combustion chamber because of worn rings or excessive valve-to-guide clearance, loose bearings and bad pistons so address any potential oil leaks before installing a new spark plug. Examine for carbon fouling through the presence of black dry fluffy carbon deposits on both insulator tips and electrodes and exposed shell surfaces and the air filter and fuel mixture. Fouling requires spark plug cleaning. A normal burning condition can be checked through visible light tan or gray deposits that appear on the firing tip. Metallic deposits along with damaged insulators indicate engine damage that may stem from improper ignition timing or fuel type selection or even from unauthorized Heli-coil threading of spark plug holes and require a whole new spark plug installation. The spark plug needs replacement if you detect white or light gray spots and a bluish burnt appearance of the electrodes from either engine overheating or using incorrect fuel along with loose spark plugs or incorrect heat range spark plugs or low fuel pump pressure or incorrect ignition timing. Examine fused deposits because this condition appears as melted or spotty bubbles or blisters that result from sudden acceleration and requires cleaning the spark plug when appropriate.