Coil wire corrosion

[gbhumphrey]

So, wasnt getting any spark, and I was checking electrical connections. I pulled the main wire out of the coil and , well as you can see in the pics, its all green. This would definitely prevent spark, yes?

[ErrorMargin]

Yes

I suspect the rest of the spark plug wires have similar issues.

It may be a good time to replace them all.

[ErrorMargin]

Coil could be bad too

[AndrewCologne]

This is no corrosion in the known way but verdigris on brass due to i.E. moisture.
The other wirings seem ok, so as first attempt, just clean the sleeve of the coil and its contact as well as the ignition wire contact.

[PeteKz]

Unusual, given that the coil points downward in the mounting on the fan shroud. Water shouldn't normally get up in there. I wonder if someone put something in there that they thought would prevent corrosion, but that actually promoted corrosion?

[E Sully]

Similar to my friends '87. His car was for the most part well maintained. Spark plugs, cap, and rotor done over the years. The thing that was overlooked was the spark plug wires were never changed.
Rubber shrinks and cracks over time. The wires are subject to high voltage, heat, cold, and water from rain and condensation over the years. Even if the wires had been changed, a small dab of dielectric grease on all the ignition wire ends will prevent this.
I posted this awhile back when I was replaced his ignition wires. It was impossible to get the end off the coil without needing to replace the coil.
Ignition Coil Wire
Regarding the dielectric grease. When installing the connector, air can be trapped in the connector with the grease lubricating it causing the rubber boots to want to pop up. Firmly push and twist the connector and make sure it is fully seated.