How often do you replace spark plug wires?

[mechanicx]

Originally Posted By: rudolphna
Well, after reading some of these comments, I'm thinking about getting mine changed. Is there really any benefit to changing them? (Better gas mileage, more power etc)


If they weren't developing high resistant, corroded or some other problem you probably won't see much of any gain. It might run a tad smoother. I guess you'll have wires that are newer and less likely to fail if nothing else.

 

[Gary Allan]

Well, I have the original fuel in the original tank! So there!!

I've had outright wire failures quite a few times. I keep stuff so long that I miss a few evolutions on things ...like different quality level of wires (that one was awhile back).

I continually check my fuel economy every tank. Reset the trip odometer every time. If the fuel economy stays steady ..within a narrow +/- range ..then it all comes down to drivability issues. Notice a few changes in cold performance ..run some fuel system cleaner ..if it lingers, change out the tune up parts. I've done 30k plug and 60k rotor/cap and never seen the difference. Wires if I rip one or a failure.