Fouled Spark Plug
#1
Fouled Spark Plug
I recently had my spark plugs changed by a mechanic. I wanted to see if he in fact did change them. Well, it appears that he did. However, my #3 spark plug was rather dirty (sooty). All of the other plugs looked fine. I only put about 1,000 miles on the car after the new plugs were installed. My question is, what would cause the fouling of that spark plug? A bad valve or a bad fuel injector? Also, would this explain why my car (97 E320 w/ 98K miles) idles rough?
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