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Spark plug wire removal tips and dielectric grease
Hello, does anyone have any tips for removing spark plug wires and do you use dielectric grease. Some of these wires have challenged me in the past. Thank you
Try pulling on the boots straight out. Pulling at any sort of angle can make them much harder to remove. For really stuck ones I use a pair of spark plug wire pliers.
As for dielectric grease, I put just a small dollop on the inside of the boot before installing. It’s not necessary to make a good connection, but it helps prevent corrosion, keep moisture out, and makes the boots easier to remove if/when you need to.
Contrary to popular belief, dielectric grease is NOT a good conductor of electricity.
It IS however, wonderful for keeping moisture out, controlling corrosion and acts as a lube for stubborn plug boots.
The experts do not recommend applying the grease to the terminal of the plug, but rather the ceramic portion only.
Much like tail-light bulbs, don't grease the contacts. Just the base.
Go figure?
The moral of the story is: Consider Dielectric Grease an automotive caulk. You are sealing out moisture, dirt, etc out of an important electrical connection such as light bulbs, plugwires.
But you would never want caulk directly on the connection.
If you have a "mis" on one cylinder and can't find a reason why, remove the plug boot and see if its jammed packed with dielectric grease.
Some Acetone on a Q-Tip should make quick work of that problem.
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Originally Posted by HeadsU.P.
Contrary to popular belief, dielectric grease is NOT a good conductor of electricity.
It IS however, wonderful for keeping moisture out, controlling corrosion and acts as a lube for stubborn plug boots.
The experts do not recommend applying the grease to the terminal of the plug, but rather the ceramic portion only.
Much like tail-light bulbs, don't grease the contacts. Just the base.
Go figure?
No idea where this belief that the dielectric grease is a great conductor came from or when it started, but it IS FALSE. GL
I use d-e grease in all electric connections for its lubrication and protective properties. I even put a thin coat on the contacts themselves! <gasp> I read/heard (from a d-e maker) that a well-fitting contact to contact joint will not be hindered by the extremely thin coating of grease left after they slide together. I'm also after keeping corrosion and oxidation for exposed contacts to a minimum in places like the fuse box. Lastly since it is non-conductive, arcing or crossover should be minimized. I've had no issues to date of any plugs, connectors, or switches not working.
Speaking of conductive... anyone else use copper anti-seize on their spark plug threads?
So yes, dielectric grease is not a conductor but it is meant to be in electric plugs including spark plugs, all over the contacts. It’s literally the entire purpose of its existence, to be on the contacts to protect them.
You can’t protect against corrosion with dielectric grease unless it is covering the surface of the metal contact. I’m not sure where this ideas comes from that it would prevent good electrical connections.
Any good electrical connection abrades the contact surfaces every time you plug it in. It is a mechanical interference fit, electrons need that metal to metal contact, not just proximity. Any grease is forced out of place for these metal connections and fills voids that would otherwise be occupied by air or water, protecting the contacts.
Why do you think they jam pack the firewall harness bulkhead plugs full of dielectric grease? Because it protects and does not interfere with electrical contact in any way. If you were relying on air to provide an electrical pathway, you already have a bad connector.
In summary, use dielectric in your connectors on the contacts, where it belongs.
Yes, dielectric grease is non-conductive, which is why it’s named “dielectric” AKA “insulator”. Its purpose is not to conduct electricity, its job is to lubricate and protect.
The below study goes in depth on dielectric grease use in the automotive industry and its benefits.
It will be paywalled, but the abstract covers the findings well. Grease on electrical contacts improves connector performance significantly in automotive applications.
They go through, at a high level, how connectors on the micro scale actually work. How these microscopically rough surfaces conduct electricity and the abrasive nature of their contact. During connection, grease and oxides are abraded or displaced when the contacts “wipe” across each other. Dielectric grease is pushed out of the way of the actual conductor when you plug in the connector.
Spark plug wire removal tips and dielectric grease
No idea where this belief that the dielectric grease is a great conductor came from or when it started, but it IS FALSE. GL 
