Thu 28 Aug, 2014 02:20 am
When one reads spark plug reviews, people say the engine runs better with new plugs. While some of that could be due to better gap in new plugs, I'm afraid some of that is placebo, like better running engine after oil change.
Now, I understand that one can measure firing voltage via oscilloscope. Is there a simpler objective test?
Thanks
MRO Supply
@mattmro444,
Aside from a visual once-over I suppose you'd need special equipment except if you have an ohmmeter I'd be suspicious of a value less than a few megohms
That's across of course. A series reading might be problematical since some plugs actually contain a resistor
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