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dirocyn
Lv 5
dirocyn asked in Cars & TransportationMaintenance & Repairs · 1 decade ago

Can low impedance spark plug wires cause a misfire?

1996 Olds Bravada, having trouble with an intermittent miss when the engine is fully warm. Tested the ignition coil wire with a multimeter and measured 1.7 ohms. The wire has "Autolite professional series premium" printed on it and is about 14 inches long. From what I've found in my own research, most spark plug wires range from 50-500 ohms per foot with Granatelli having the lowest advertised at 2 ohms/foot. I'm guessing this wire had higher impedance when it left the factory--otherwise Autolite would brag about it. But could it cause a missfire?

3 Answers

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  • gee-man
    Lv 7
    1 decade ago
    Favorite Answer

    seems like you already know the answer.

  • LeAnne
    Lv 7
    1 decade ago

    The plug wire core is concerned more with radio suppression than impedance or resistance. Solid wire core wires produce the least voltage drop and are generally used for racing or off road but they also produce the most RF interference. Carbon impregnated wire cores produce the best RF suppression and are used in most OEM vehicle applications. Obviously, with the newer coil-on-plug applications, this all becomes a moot concern.

    Neither wire will produce a misfire if everything else in the ignition system is operating properly and the wire insulation is good.

  • oldcork
    Lv 4
    1 decade ago

    sounds more like a cracked distribator cap will cause this problem

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