Spark Plug Wear

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If you pull one of your spark plugs out and measure the electrode gap, is that a good indication of the gap for the rest of the spark plugs ?
 
Certainly if you take one out and find it's worn out, time to replace them all.
 
within a certain range, yes. Unless you can measure it to the super micro units likw 0.0000000000000000000000000000000000001 micrometers
 
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Originally Posted By: JMJNet
within a certain range, yes. Unless you can measure it to the super micro units likw 0.0000000000000000000000000000000000001 micrometers

10^-43 meters is very small indeed. 100 million times smaller than the Planck length, which is believed to be the shortest meaningful length.

(Yes, I realize you were using hyperbole but I couldn't help myself from converting to scientific notation!)
 
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On late model engines:

On Iridium tipped plugs, I'd go by mileage. Reason is that there's a tiny
hard to see iridium pad on the ground electrode that's super thin, when it burns
away at about 100K miles, the gap will look OK and even gage OK, but as the iridium
disappears off the ground, you'll suddenly burn away the plug to a misfire and damage
the Cats. The fuel mixture is lean and hot so the soft steel in the ground electrode
won't take it.
 
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