After 60,000 miles it is highly recommended that spark plug wires, distributor cap and rotor be replaced; on distributorless ignition just spark plug wires. The reason is that under hood vehicle electrical components over time are exposed to moisture, oil, grease and temperature that can rise as high as 550 to 700 degrees. As a result spark plug wires, distributor cap and rotor, insulation break down treating an easier or alternative path to ground. Worn spark plugs also cause higher voltage requirements causing the ignition module and coil to produce higher and higher voltages to overcome the resistance. The resulting higher voltage breaks down the spark plug wire's insulation creating an easier path to ground. This causes the ignition module and coil to produce even more voltage, creating even higher current temperatures within them. Remember, higher resistance correlates to higher current temperatures and that electricity always tries to find the easiest path to ground. This higher than normal resistance weakens transistor and electrical insulation within module, coils and computers resulting and intermittent and premature failure. As a result you may experience a variety of derivability problems. These problems are sometime hard to diagnose due to the intermittent nature of electrical components as a result of temperature, heat and moisture; resulting in expensive diagnostic time. If you have already experienced an ignition module or computer failure after 60,000 miles and haven't replaced your spark plugs wires, distributor cap and rotor you most likely will experience the same problem again.

Most ignition modules range in price from $200.00 to $450.00 plus labor! The same is also true for vehicle computers.

Yours Truly

Ron L. Dively

Certified Master Technician,


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