Quote:
Originally Posted by Brian Carlton
Removal of the plug to check heating pattern is the defacto standard.
However, it's a lot of work and isn't warranted unless you demand absolute performance in temperatures that are frequently below 0°F.
I've used the method with the ohmmeter for the last 12 years and have never failed to identify a bad plug. If the resistance is between .7 and 1 ohm, I let it go. If it's open or greater, I change it.
Fortunately, I have never encountered a plug that wouldn't perform but had proper resistance readings.
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I am a newbie, so it is only in the last 5 years, not 12. If it had a 'dead short' then the fuse would either blow or the GP will become open circuit when the massive current went thru the next time. As for GP measurement, any run-of-the-mill cheapo would do to measure resistance.