Had a consistent P0301 (misfire on cylinder 1), whole truck would shake a bit after idling (or running for a short time if I turned the key and moved immediately). Replaced the plug and no code thrown. Everything after the coil replaced with new OEM about 3 years back. Plug tube seals as well. Wondering if someone with more experience than I have can take a gander at the old plug and suggest a cause. The gap looks bigger to me on the old plug, like the electrode/s have been partially vaporized. (I'm assuming the side electrode didn't bend. )
History: Engine runs a pretty constant P0130 or P0133 and/or P0170--but if that was a major contributor, wouldn't I have misfires all around? Reason I changed everything out 3 years back was, some time after purchase, had a major misfire on #6, felt like the whole truck was going to rattle apart. I actually had it towed the half-mile home; it was that bad. #6 plug was covered with oil. No ignition issues since--until now.
Two shots of same old plug--then again beside the new. Thanks for any help!
History: Engine runs a pretty constant P0130 or P0133 and/or P0170--but if that was a major contributor, wouldn't I have misfires all around? Reason I changed everything out 3 years back was, some time after purchase, had a major misfire on #6, felt like the whole truck was going to rattle apart. I actually had it towed the half-mile home; it was that bad. #6 plug was covered with oil. No ignition issues since--until now.
Two shots of same old plug--then again beside the new. Thanks for any help!