Impreza GT F4-2.5L Turbo (2009)
4. Overheating:
White or light gray insulator with black or brown spots and bluish burnt electrodes indicate engine overheating, incorrect ignition timing, improper
fuel, or loose spark plugs.
4. Overheating:
White or light gray insulator with black or brown spots and bluish burnt electrodes indicate engine overheating, incorrect ignition timing, improper
fuel, or loose spark plugs.