Just happen to check a spark plug wire and the photo below shows what I found.

I cleaned the corrosion from the plug wire and the power pack, coil or whatever it's called and reinstalled. Never had any misfires or anything like that. I just thought I'd check the resistance of one of the plug wires. I did check the resistance and it was 2186 ohms. The wire says on it 2K ohms so I suppose I'm close enough. AM I ok with a reading of 2186 ohms?

Questions:
What could have cause this corrosion?
Should the wire be replaced? or the coil or both?
Would the corrosion be caused by a problem with the coil?

Possible cause: When I changed my plugs about 25K miles ago I recall having
taken this plug wire off. I, obviously, did not get it back into the coil properly as the end that is suppose to snap in the coil was bent in half. However the the vehicle has alway run fine.

So could a poor contact have caused this corrosion or is it something else? The other plug wire on this coil was fine.

Attached Thumbnails