OEM Lincoln LS Spark Plug

Lincoln LS Spark Plug Parts and Q&A

• Spark Plug
  AGSF-32F-MX
  Q: How to service and repair a spark plug on Lincoln LS?

  A:

  Service and repair of spark plugs should start by taking off Ignition Coils followed by removal of plugs from the system. Compressed air should be used prior to removal to remove any foreign substances from within the spark plug well. The gap between spark plug electrodes should be checked for deposits that cause bridged gaps due to oil or carbon fouling. Princeipal cleaning procedures for the spark plug must be performed. Sensor oil fouling can be identified by black wet deposits on insulator shell bore electrodes; inspect for this problem since it occurs because oil gets inside the combustion chamber from rings and Pistons wear or excessive valve-to-guide clearance or loose or worn bearings; resolve any oil leakage before installing a new spark plug. The presence of black fluffy carbon deposits on the spark plug insulator tips as well as the exposed shell surfaces and electrodes may indicate incorrect spark plug heat range or air cleaner contamination or rich fuel mixture or excessive idling. In such cases one should clean the spark plug. A normal burning pattern will show light tan or gray residues on the spark plug firing tip. The indicator of pre-ignition damage appears as melted electrodes as well as potential insulator damage accompanied by engine-related metallic deposits; this condition may stem from incorrect ignition timing or improper fuel choice or the use of heli-coil threaded inserts instead of spark plugs thereby requiring a new plug installation. A spark plug requires replacement if the technician detects overheating indicated by a white or tight gray insulator with small black or gray-brown spots and bluish-burnt electrodes that can result from engine overheating, the wrong type of fuel, loose spark plugs, spark plugs with an incorrect heat range, low fuel pump pressure or incorrect ignition timing. A visual inspection should also include a check for fused spot deposits that look like bubbles or blisters from abrupt speeding up which requires cleaning the spark plug if found. End the installation process by following the reverse steps of removal while conducting any necessary spark plug gap adjustments.
• Spark Plug
  AGSF-22F-SMX
  Q: How to inspect a spark plug for issues such as bridged gaps, deposit buildup, and signs of fouling on 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.