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Volkswagen Rabbit, Jetta, Scirocco, Convertible: 1975-1984 (A1) spark plug wires resistance reading


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Last Post: Mar 8, 2014 11:18 AM Last Post By: tcovenant2000
booboobus

Posts: 6
Registered: 03/07/14
spark plug wires resistance reading
Posted: Mar 7, 2014 9:59 AM
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Checked some wire I had that look good yesterday , set multi meter to 20 k wires tested at range of 5.00 everything in that area up to around 5.70, but when i put them on I have some slight missing under load, what should wire read for 1.8 Gti 1983 motor, thanks Also I believe these wires are out of a later 90's model jetta does that matter? thanks for your help in this

Edited by: booboobus on Mar 7, 2014 11:19 AM
tcovenant2000

Posts: 1,761
Registered: 12/09/03
Re: spark plug wires resistance reading
Posted: Mar 7, 2014 8:52 PM   in response to: booboobus in response to: booboobus
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The easy answer is that wire resistance is typically measured in Ohms per foot. For a typical VW 4 cylinder, the wires aren't terribly different in length. If you stop to think about it, if you had a bad wire you should see one with crazy high resistance compared to the others. The fact that they are all about the same indicates they are OK. That doesn't mean they are the right wire for your engine/ignition.

Thomas
booboobus

Posts: 6
Registered: 03/07/14
Re: spark plug wires resistance reading
Posted: Mar 8, 2014 9:53 AM   in response to: tcovenant2000 in response to: tcovenant2000
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Thanks Thomas,

Makes sense
tcovenant2000

Posts: 1,761
Registered: 12/09/03
Re: spark plug wires resistance reading
Posted: Mar 8, 2014 11:18 AM   in response to: booboobus in response to: booboobus
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The easy answer, if you're not sure, is to go and get a new set. A good set is about $30. Cheap insurance, especially if they're a few years/miles old. I don't know if there is any diff between your electronic ignition and the 1990 from which your wires were taken. But if you got them from a junker or they were used, even more reason to get new ones.
Resistance isn't everything, either. There's also insulation resistance. That's hard to test. But wait until night-time and start the car. Then use a spray bottle on "MIST", not on "squirt" and lightly mist the plug wires while the engine is running. If you see sparks and lights then the wires are bad.

Thomas

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