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Jacksonlll · 10-19-2019, 06:09 AM

Just clean them and see how long it takes for them to foul again. Model A plugs need frequent cleaning. No big deal. Slow driving for a long time, a parade, running rich can all foul them.

10-19-2019, 06:09 AM	#3
Jacksonlll Senior Member Join Date: Jul 2012 Location: Michigan-- Member of Oakleaf of MARC Posts: 1,686	Re: Black spark plugs Just clean them and see how long it takes for them to foul again. Model A plugs need frequent cleaning. No big deal. Slow driving for a long time, a parade, running rich can all foul them.