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Old 05-14-2002, 11:04 PM
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Join Date: Jan 2002
Posts: 177
Plug wire resistance variance?

Greetings forum members,

Can anyone tell me what, if any, is the permissable spark plug wire resistance variance.
I just checked the plug wires on my 1972 350sl, m117 engine, and the resistances ranged from 6.05 ohms to 6.36 ohms.
Is this acceptable?
As posted earlier I have an engine shutter between 1300 & 1500 rpms.
My ideal plug resistance is 6 ohms, 1 ohm at the cap and 5 ohms at the plug.
Could this variance be responsible for the shutter?
The trigger points have been ruled out as the problem.
The shutter occurs with them disconnected.
The engine is almost running premo thanks to this forum.
I am very thankful for all the assistance.
I just came off a 250 mile trip from Boston to central Jersey and averaged 16 plus miles per gallon which included a fair amount of stop and go traffic.
The owner's manual rates the car for 17 mpg @ 68 mph.
Highway/City mpg = 17/11 mpg


.
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Old 05-15-2002, 02:42 AM
MikeTangas's Avatar
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Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
I think you should have the replaceable resistor ends. They should be 5K ohms and the wires themselves maybe 1K???. The resistor ends unscrew from the plug wire, carefully roll the boot back and unscrew the resistor end, then check the ends and wires again. Be sure to wiggle the wires while testing for intermittent fluctuations. That is providing you still have original style wires/ends.

BTW: Nice mileage figures. I'm happy to touch on 16MPG @75-80 in the 4.5.
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Old 05-15-2002, 03:02 AM
hill's Avatar
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Location: Northern Calif Sacramento
Posts: 736
1K

I get 1K ohms on factory wires with the metal RF shields.
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