Sundance Duster L4-153 2.5L VIN K FI (1992)
Spark Plug: Testing and Inspection
Dry, Fluffy Black Deposits - Cold or Carbon Fouling
Normal Operation And Carbon Fouling
Symptoms: Dry, black deposits on the electrodes.
Possible Causes:
^ On one or two plugs, may be caused by sticking valves or defective spark plug cables.
^ On the entire set, may be caused by a clogged air cleaner.
^ Poor Ignition Output
Note:
Cold fouling is normal when the vehicle is only operated for short periods. The spark plugs do not reach a high enough operating temperature
during short operating periods to burn fuel completely.