OEM 2005 Lincoln LS Spark Plug

2005 Lincoln LS Spark Plug Parts Questions & Experts Answers

• Q: How to inspect a spark plug for issues such as bridged gaps, deposit buildup, and signs of fouling on 2005 Lincoln LS?

  A: A bridged gap on the spark plug should be inspected in combination with checking for deposit buildup which closes the gap between electrodes due to oil or carbon fouling. Take appropriate measures to clean the spark plug if needed. Examine the insulator shell bore electrodes for black wet oil deposits to determine if the excessive engine oil has entered the combustion chamber because of worn rings or pistons or excessive valve to guide clearance or worn or loose bearings. Fix these oil leak issues before replacing the spark plug. Black dry fluffy carbon deposits on insulator tips and shell surfaces along with electrodes indicate improper heat range and dirty air filters or too-rich mix or excessive idling conditions thus new spark plugs become necessary for replacement. The spark plug firing tip should display either light tan or gray residue to indicate proper burning operation. Engine problems due to wrong ignition timing or fuel type or heli coil usage instead of spark plug threads will require a new spark plug replacement. The same applies if pre-ignition causes melted electrodes and broken insulators with metallic buildup. White or light gray spots on blackened electrodes along with a bluish burnt electrode appearance signify engine overheating, wrong fuel type, loose spark plugs, incorrect heat range spark plugs, insufficient fuel pump pressure or incorrect ignition timing so a new spark plug needs replacement. Available spark plugs need replacement when fused deposits become visible since these resulting deposits form bubbles or blisters after sudden acceleration.