OEM Lincoln Mark LT Spark Plug

Lincoln Mark LT Spark Plug Parts and Q&A

• Spark Plug
  PZK-1F
  Q: How to inspect a spark plug for issues such as bridged gaps, fouling, and overheating on Lincoln Mark LT?

  A:

  Inspect the spark plug gap for wiring condition while searching for deposit accumulation that could seal the element gap. Oil and carbon fouling would have caused this condition. Check to determine if cleaning the spark plug would be required. Check for oil contaminant indications through black wet deposits on the spark plug shell bore electrodes but address any oil leakage problems first because such conditions stem from worn rings and Pistons or excessive valve-to-guide clearance or worn bearings or loose parts. Examine the insulator tips along with exposed shell surfaces and electrodes for black dry carbon accumulations because this occurrence indicates improper heat range usage, unclean air filters or fuel mixture problems or extended engine idling; cleaning the spark plug becomes necessary when carbon fouling exists. The inspection of normal plug burning requires you to search for light tan or gray residue on the firing tip. The presence of melted electrodes together with insulator damage and metallic residues means engine damage most likely stems from incorrect ignition timing or wrong fuel choice or unauthorized hell-coil installation inside the spark plug thread necessary for replacing the plug. Examine your spark plugs for overheating symptoms that include white or light gray spots and bluish-burnt electrodes because such conditions stem from engine overheating and result from improper fuel usage or loose sparks plugs or the wrong heat range or low fuel pressure or incorrect ignition timing. You should replace overheated spark plugs immediately. The inspection for fused deposits should be performed because they manifest as melted or spotty deposits with bubble or blister patterns which typically occur from sudden acceleration events requiring spark plug cleaning.