Tribute 4WD L4-2.3L Hybrid (2008)
3. Inspect for carbon fouling. Look for black, dry, fluffy carbon deposits on the insulator tips, exposed shell surfaces and electrodes, caused by a
spark plug with an incorrect heat range, dirty air cleaner, too rich a fuel mixture or excessive idling.
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Install new spark plugs.
4. Inspect for normal burning.
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Check for light tan or gray deposits on the firing tip.
5. Inspect for pre-ignition, identified by melted electrodes and a possibly damaged insulator. Metallic deposits on the insulator indicate engine
