Ok so I'm changing plugs and wires on the GM product in my garage (89
Caprice, 305, TBI) when I thought to do something I had not done with a
tune up before... ohm the plug wires.
Trouble is I'm not really sure if the results are good or bad or neither.
Took two wires for the same plug (same length) and tested them.
Multimeter set on 20K Ohm's -- old wire came in at 12.5 and the new
wire was 10.5
That level of difference seemed uniform across the set. Shorter length
wire had less resistance - as I guessed it would, being shorter... less
cable to travel through... old wire was 9.5 new wire was 7.5
Nice to see the old wires had higher resistance... as that makes me feel
that much better for replacing them... regardless of the fact that the
rubber boots felt mealy, and were discolored. The 1/2 inch or so
portion of the wires that protruded out from the distributor end of the
plug wire boots were also a yelowish tint on the grey wires. Further
leading me to believe it was time to change them. Didn't help that I
ripped the terminals off a wire or two trying to get them off the plugs.
Anyway.. back to the ohms. 20K setting would mean that the resistance
of that first wire I tested was 12,500 omhs - and the new wire was
10,500 omhs - correct? Is a 2000 ohm difference in resistance a big deal?
-- terribletom
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