My newest vehicle is a 98 Explorer - still the older 'distributorless'
ignition system. When the ignition wires failed for the second time, I
thought that COPs were the ultimate solution to this problem. What's better
than making the high voltage right on the plug? No long path with twists and
turns, no insulation to dry out, no cross-firing between cylinders when you
don't dress those wires properly, even less opportunity for radio frequency
interference... But from reading the adventures of those who actually own
those things, I understand that instead of replacing a set of wires every
couple years for $100, now it's a set of COPs for $500 (dealer's prices).
Assuming that you even know how to diagnose those things -- is there a spot
to stick a scope probe in there at all? Does this 'improvement' make any