Dynasty L4-153 2.5L SOHC VIN K TBI (1992)
Oil Or Ash Encrusted
If one or more plugs are oil or ash encrusted, evaluate the engine for the cause of oil entering the combustion chambers. Sometimes fuel additives
can cause ash encrustation on an entire set of spark plugs. Ash encrusted spark plugs can be cleaned and reused.
Premature Electrode Wear - Preignition Damage
PREIGNITION DAMAGE
Preignition Damage
Excessive combustion chamber temperature can cause preignition damage. First, the center electrode dissolves and the ground electrode dissolves
somewhat later. Insulators appear relatively deposit free. Other possible causes include ignition timing over-advanced and incorrect spark plug
heat range.
Spark plugs are designed to operate within a specific temperature range, called spark plug heat range. Variations in thickness and length of the
center electrode and porcelain insulator change how fast the plug can dissipate heat and determine the plugs heat range.
Determine if the spark plugs are the correct type, as specified on the VECI label, or if other operating conditions are causing engine overheating.
Red, Brown, Yellow or White Deposits - Fuel Additives
