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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.