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

 

Ron, corrosion is from any moisture getting to the metal surface, and in many cases can be the cause of what seems to be a serious electrical problem.The brass contacts are very easily corroded like this in many applications, especially in damp/ocean-like (salt water areas) climates. You can clean the areas with a " electrical contact cleaner", and mabye a small brush to get in there. I would clean them up, and use again, since there really isn't an issue with the rest of the components. You can even put a small film of penetrating oil on the metal contact surfaces. Just don't use WD-40, since it's not the best for elctrical connections. I have used a special grease for this purpose as well, but really not needed in your case.