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Plug Wire Resistance

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Old Aug 23, 2010 | 10:10 PM
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Default Plug Wire Resistance

Today I received a new set of Denso plug wires, and decided to get out the multimeter to compare them to the old ones.

A couple of my stock wires didn't even budge the analog meter( infinite resistance). The rest were between 40 - 100k ohms. I'm assuming this is what was causing my random misfires.

The new denso wires tested around 3k ohms, except for one of the new wires was 25k ohms for some reason. Should I be concerned with that?

Last edited by V8drummer; Aug 23, 2010 at 10:25 PM.
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Old Aug 24, 2010 | 12:43 PM
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"A conventional plug wire has a resistance of 10,000 to 15,000 ohms per foot of length--if it's measurably higher, the wire probably is bad. An absolutely failed wire will have a hairline break somewhere, and the resistance will be infinity." -Popular Mechanics
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Old Aug 25, 2010 | 05:18 PM
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Well this wire is almost 3 feet... So that would put in a little over 8k ohms per foot. Still seems a little high for a new wire, especially when the rest are all much lower.
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