Those simple conductors evolved to require insulation to shield the ever-increasing voltage from jumping to an unintended ground rather than through the spark plug. Not only did insulation join the features list for plug wires, increasing use of electronics as the decades wore on required the development of EMI and RFI suppression. Electromagnetic and radio-frequency interference can be a real pain in the butt. The most common instance of radio frequency is the phenomenon that occurs when a home mechanic replaces the plug wires on a vintage car and afterwards the radio has a pinging noise whenever the driver turns on sweet tunes while the engine is running.
That pinging noise is the radio-frequency interference from an uninsulated plug wire. That electrical noise can wreak havoc on everything from AM radios to engine and transmission control computers. So if a little insulation is great, more must be better, right? Yet again, not quite. Like everything in life that is good, that insulation has side effects.
The side effects are resistance and cost. The resistance of many wires is measured in ohms per foot. A wire with high resistance can be in the ohms per foot range for especially high-output ignition systems, whereas a low resistance performance wire could easily get double digit ohms per foot.
Lower resistance means more of the ignition coils energy is going towards bridging the gap or the spark plug. Also in Exterior - View All. Also in Fasteners and Hardware - View All. Also in Restoration - View All. Also in Gaskets - View All. Also in Brakes - View All. Also in Ignition - View All. Also in Cooling - View All.
Also in Tuners and Programmers - View All. Also in Data Acquisition - View All. Also in Electrical - View All. Inspect it for similar failures. Set the ohmmeter to the appropriate scale and measure the wire. For the domestic wire a good reading is no greater than 12, ohms per foot. This is at the high end and quality wires will read 4, to 5, ohms per foot. Refer to the repair manual for import plug wire specifications. Test the wire from end to end with the leads of the meter.
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