Different size spark plugs, same part number

analcvntB to Mechanic Advice@gearhead.townEnglish · 1 year ago

Pulled plugs on my 99 Tacoma. All cylinders except 5 had the same size plugs as oem. Cylinder 5 plug has the same part number as the rest but is wider, what is the cause of this? I’m assuming a re-threaded hole.

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