Impreza WRX STI F4-2.5L Turbo (2008)
4. Overheating:
White or light gray insulator with black or brown spots and bluish burnt electrodes indicate engine overheating, incorrect ignition timing, use of
improper fuel, and 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, use of
improper fuel, and loose spark plugs.