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Originally Posted by Agoudine
I've been advised a lot to replace ignition wires, cup and rotor. I bought parts online and replaced: ignition wires and cup (BOSH) and rotor (Japan). Works great - performs better. But I have questions. Why the wires need to be replaced? Plugs,rotor,cup - I understand, they get worn,but my old Prestolite wires did not have any visible signs of damage or rust described in Haynes manual. They look even better than my new ones! And I wonder -it's simply wires-how are some brands better than others and how do they wear out? How do wires affect fuel economy?
Thanks in advance!
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The insulation on the wires can breakdowns over time, not necessarily from rubbing against anything. Once this happens you'll lose some high voltage going to the spark plugs, which fouls them up. Then the car will start getting poor milage. If you look at a $30 per of wires compared to $75+ pair you will see the difference on how they are assembled.