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Cleaning spark plug cables improves spark - routine maintenance? 200 1979

posted by  sutherml on  Fri Jun 11 03:11 CST 2010
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last visit: Sat Jun 29 19:15 CST 2013
[RELATED]

Black silicone rubber spark plug cables don't show if they are covered with black crap, probably carbon/rubber dust from belts, yet my cleaning of 3-year old cables with a degreaser soaked tissue paper sent the tissue black with crap. Same crap was on the cable separators/holders.
This easily improved starting, so the crap must be conductive, reducing available energy to the spark plug. Same result with my wife's Toyota.

I know that there are on some cars spark plug cables with carbon-impregnated nylon strands acting as the central resistance "wire" and this deteriorates with time forcing periodic replacement, but in spiral-wound resistance-wire type cables the central wire should last a long time as it is metal and be vibration resistant due to its spiral construction? How long do spark plug cables last?

I can't find anything in Haynes or BrickBoard posts or FAQ on cleaning spark plug cables (eg yearly), yet it improved starting - the cables were not damp with condensation etc. Is this an "obvious procedure" that experienced maintainers do? I sure would appreciate any feedback.





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