Thread: spark plugs
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Old 06-25-2003, 08:39 PM
Kestas Kestas is offline
I told you so!
Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,804
I do it all the time! I rarely replace plugs - just clean and regap. I've been doing it for over twenty years for all the cars I take care of with no ill effects on performance. I replace the plugs when the center electrode is worn too far. The money saved has added up over the years.

I clean plugs by grit blasting. Besides removing all the deposits, the key point is to clean the insulator nose around the center electrode. Deposits on the insulator can provide a leak path for the spark. Then I finish-clean the plug by wire-wheeling the threads and inspect around the insulator to make sure there is no leftover grit trapped inside.

Just a reminder - don't forget to put a thin coat of neversieze on the spark plug threads before installation.
95 E320 Cabriolet, 140K
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