Any suggestions on cleaning the plugs ( removing carbon ) that won't remove the iridium coating. I know the plugs are supposed to last much longer, but what is the advantage if they carbon up? I have not had much luck using carb cleaner or oven cleaner.
When I was having plug fouling problems from carbon buildup, I used Sea Foam to soak the plugs in. I put the plugs in a small jar and only poured enough Sea Foam in to cover the carboned area and let them soak overnight. I then lightly brushed them clean with a bristle parts cleaner brush and blew them out with an air compressor. Cleaned like new.
I soak them in brake parts cleaner and use a small brass brush
Hi Jon. I cleaned my iridium plugs with brake cleaner and a brass brush about 6 months ago. A couple days later I read an article from one of the iridium plug manufactures that warned not to use any kind of metal brushed on iridium electrodes. Nylon or similar was suggested. It seems that cleaning the electrode with a metal brush can lead to electrode failure and catastrophic engine damage. I don't know if it is true however I replaced the plugs with new ones that day. I wish I could find the article again
Just found one of the links http://www.globaldenso.com/PLUG/qa/tech/qa_23.html