Posted by jdemaris on December 16, 2010 at 05:39:58 from (67.142.130.16):
In Reply to: Re: OT Spark plug wires posted by ted regentin on December 15, 2010 at 21:26:33:
The poster asked if they "had to" be changed, not if wires EVER need changing.
And yeah, some cars have OBI instead of OBII, and some have no on-board diagnositics at all. In fact, some care don't even have plug wires. For older rigs, I doubt there's much that's going to get hurt by a bad plug wire.
I never said that plug wires never need to be replaced. But, to change them just for the heck of it at X amount of miles is a waste of time and money. I'll add, to compare changing plug wires - to changing camshaft belts - as somebody did here - is rediculous. Cam belts have strict mile-change requirements and can ruin an engine if they slip or break. Many new engines are still "interference" design.
If wires still have good insulation, good internal resistance, and boots - why on earth would somebody change them? No gain, no added reliability insurance, just money spent. In fact, I know that sometimes new aftermarket wires are inferior to the OEM wires that get removed.
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