Re: Enlighten me about spark plugs

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May 5, 2015 at 11:26 am #15373
frankr
Participant

    I seriously doubt the heat range (J4 vs J6) had anything to do with it. Something else is going on there. You mentioned Bosch. I am totally ignorant concerning Bosch numbers. They may not be exact interchanges. Maybe a resistor plug or a booster gap plug or something on that nature? Or I could be off base here. Also could be something as simple as different plug gap.