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Thread: Ignition spark plug wires, age/RFI question.

  1. #1

    Question Ignition spark plug wires, age/RFI question.

    As ignition spark plug wires get old, do they emit RFI? If they were rated 50 Ohms per foot, whats the acceptable threshold limit as they age? The wires are working, no driveability or performance problem. They're just picking up RFI noise in radio & same car on chassis dyno that used to read RPM signal fine. Now it disturbs RPM signal to dyno electronics gets interference, where unable to read with inductive pickup hooked up due to what I mentioned. Thanks in advance.

  2. #2
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    Quote Originally Posted by harry k View Post
    As ignition spark plug wires get old, do they emit RFI?
    Yes, they can emit voltage leaks (stray sparks). Try this test: https://forums.holley.com/showthread...1298#post51298 (Related Forum Thread)
    May God's grace bless you in the Lord Jesus Christ.
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  3. #3

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    Also, are there any cracks in any of the wires?
    shake-n-bake

  4. #4

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    Quote Originally Posted by Danny Cabral View Post
    Yes, they can emit voltage leaks (stray sparks). Try this test: https://forums.holley.com/showthread...1298#post51298 (Related Forum Thread)
    Will do and get back.
    Quote Originally Posted by msdtech50 View Post
    Also, are there any cracks in any of the wires?
    MSD tech, no there isn't any, but if you have any ballpark figure on what's the acceptable threshold limit as they age?

  5. #5

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    OK, did the water spray test tonight. I cannot see any leaky sparks in the dark.

  6. #6

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    They should be 40 to 50 Ohms per foot. Even as they get older.
    shake-n-bake

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