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I've been running these oem spec motorcraft spark plugs for 4,000 miles with my 93 tune. Both were pulled same time from each head. Thoughts on appearance? Wideband reading is 14.7 when cruising and when I romp around, the AFR increases towards the rich side going as low as 13.2 at times under acceleration. I've only seen it in lean or above 14.7 when I first start the car and it is warming up. Even then though, it only hits 15-16 sporadically a handful of times and only for a split second or two.
LTFT bank 1 is mainly at .93 - .95 and LTFT bank 2 sits steadily around .95.
STFT bank 1 is generally within 2-3% as is bank 2 STFT.
Mods are shorty headers, high flow cats, x pipe, deletes, roush open box cai and custom todd warren cams with phaser limiters. Tuned on 93.
They look pretty normal to me, tan is what you want. If it were black and sooty or wet, you'd be running too rich. If they were white and glazed then too lean.
5/5/24, 04:27 PM
