Proper resistance of spark plug wires???

[atomicjoe23]

What is the proper resistance/inch for OEM spark plug wires???

Thanks!

 

[alwaysFlOoReD]

bump

 

[srteach]

You don't want any appreciable resistance in the wires, that would cause them to overheat and melt (or break down the insulation on the wires). If you have more than 5 ohms / foot it is too much, though it probably will still work.

 

[Sasquatch_Ryda]

Less than 10,000 OHMs per foot is the norm.

 

[atomicjoe23]

OK. . .two answers that are so far apart it's almost (almost) funny.

I couldn't remember exactly what the resistance I had found before, but it was low and 10,000 Ohms/foot sounds a little ridiculous; even 5 ohms/foot sounds like a lot. I don't remember for sure, but I think I had 1 ohm or less the last time I did this (stupid Ranger manual, wish it had a spec for this. If I had known it wouldn't be in the Ranger manual I would have wrote it down out of the Camaro manual).

Thanks for the help! I will compare #4 plug wire to the other cylinder plug wires that aren't misfiring.

 

[Sasquatch_Ryda]

Believe me or not if you want. Factory plug wires should be between 1000 and 10,000 OHMs per foot.

If you had 1 ohm or less you were on the wrong scale on your meter.

 

[atomicjoe23]

Well. . .time to insert foot into mouth. . .another forum posted 1000 ohms per foot as well.

Like I said though, I couldn't remember and don't have the manual anymore.

Thanks for the help Sasquatch Ryder.

 

[atomicjoe23]

Measured mine at 6.51 on the 20K scale. . .so that should be 6500 ohms, the plug is 28" long so that's ~232 ohms/ft. . .shouldn't be excessive and I haven't had a reoccurence of the problem since I changed #4 plug (again) and repalced the fuel filter (needed done anyway so why not). . .

. . .but I'm not necessarily holding my breath, I think there is another problem somewhere.

I'm gonna compare that to one of the other cylinders that isn't having a misfire problem.

 

[atomicjoe23]

Measured #6 and got 4.39 ohms on the 20K scale. . .4390 ohms over 21" resulting in 209 ohms/ft. . .pretty close, don't think it's a plug wire problem.

 

[wendorms]

OK. . .two answers that are so far apart it's almost (almost) funny.

I couldn't remember exactly what the resistance I had found before, but it was low and 10,000 Ohms/foot sounds a little ridiculous; even 5 ohms/foot sounds like a lot. I don't remember for sure, but I think I had 1 ohm or less the last time I did this (stupid Ranger manual, wish it had a spec for this. If I had known it wouldn't be in the Ranger manual I would have wrote it down out of the Camaro manual).

Thanks for the help! I will compare #4 plug wire to the other cylinder plug wires that aren't misfiring.

I just bought a set from NGK and they measure .044 ohms per inch which is .528/foot. Am I checking them wrong?

 

[alwaysFlOoReD]

What scale did you use?

 

[msubully82]

It should be pointed out that the wires have resistance for a reason. It helps suppress radio frequency interference caused by the spark plugs firing, to limit interference in the car radio. There is no good reason to use low resistance spark plug wires that I am aware of, unless you are racing.

Don