SOURCE: spark plug gap spec. for 1997 ford ranger/4.0 liter
for the most part it is under the hood of your car where the sticker say engine size try this website to see if they have you car listed its www.autozone.com if not call your local part store and tell them its a 4.0 liter and you need the gap on the spark plugs
SOURCE: what is the spark plug gap setting for a 1998, 4
it realy wont bother the car to much what you set it at but go for a gap of 18 to 25 th of an inch
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