i live in illinois and i just changed my spark plugs 4 months ago they were all rusted on some of them broke off. i just figured it was the idiot who owned the truck before me not changing his spark plugs ever. So i eventually got them off and i noticed after only 4 months they are extremely rusty again. does anyone else have this problem i have a 1992 5.0 bronco.

 

If the rust condition exists in the threads and wells in the heads and they are not cleaned the oxidation will extend to any new metal introduced to the atmosphere immediately.

 

Add some dielectric grease to the plug ends where the spark plug wires go then add some anti seize lub to the spark plug threads.

 

I'm rusty 70 y/o and still work. Guess I don't understand your concern about rust on the plugs.

 

You do not want to use DIELECTRIC GREASE on the plugtip/wire connection. Or any electrical connection, it is an insulator. There is a "grease" you can use that is a conductor & will help that is available at the parts counters most everywhere. The anti-sieze will help next time you change plugs.

 

That's interesting, I was also told to use Dieletric grease on plug wires. Guess me and Manfred had the same shop teacher eh? I've never used it personally because I either don't change my plugs or I forget to buy some. I do, however, have anti seize. A nice big tub of it.

 

I also thought Dieletric was the preferred method. I have used it on plug boots and every connector for years. Everything works great.
Question...with multiple wires in a connector, wouldn't a conductor cause a short?

 

That's probably why dielectric grease is used instead of this "conductive grease"...

 

Multiple wires in a connector such as stereo wiring plugs? I would think the "grease" gets pushed into the connector and the plastic between each contact point would prevent shorting.

Another reason not to use it though, is the mess it makes. You put it on a plug wire, then a few months or so down the line you change out your plugs but not your wires, now you have this crusty corrosion like stuff on the plug wire. Not worth it.

 

I use dielectric grease on every tune-up I do. NEVER had a problem.

 

"Multiple wires in a connector such as stereo wiring plugs?"

Dielectric is on my PCM, Transmission harness connectors, TPS, ACT, ECT, O2, IAC, window motors, and also speaker connectors. I'm sure I forgot some...and distributor connections and spark plug connectors, EGR sensor, Canister solenoid....you get the point.

It still runs great.