Help me out, fella's! I can't remember what causes black soot on all four plugs; is it a timing (too advanced/retarded) issue or a mixture issue (too rich/lean) or both???
Usually, if there's not an oil burning problem, it's due to running too rich. I sooted up my plugs so bad the car wouldn't start! I learned to use the carb adjustment properly after that.
Thanks, Charlie, I appreciate the input and I apologize for the re-post. I must be loosing it because I posted the same question in July but forgot the answer! Too rich it is.
If you let the car idle for a minute before shutting off they always look black. If they are not fouling, don't worry about them.
Too rich a mixture.
If it runs good, it doesn't matter. Too many people look at their plugs way too often.
But to answer your question, yes, too rich, as others have also confirmed.
Too narrow a plug gap can also cause the plugs to soot up.