Grand Cherokee 2WD L6-4.0L VIN S (1997)
Spark Plug: Procedures
PLUG CLEANING
The plugs may be cleaned using commercially available spark plug cleaning equipment. After cleaning, file the center electrode flat with a small
point file or jewelers file before adjusting gap.
CAUTION: Never use a motorized wire wheel brush to clean the spark plugs. Metallic deposits will remain on the spark plug insulator and will
cause plug misfire.
