I’ve also heard checking the fuel filter is important. A clogged filter can cause rough idling and black smoke too. Could this be related?
Absolutely, a clogged filter restricts fuel flow which can lead to rough idling. Keep it in mind while troubleshooting!
Thanks for all the tips! It feels like I’m trying to solve a mystery here, with my car as the suspect. 
I’d suggest checking your air filter first! A clogged filter can cause engine performance issues, leading to rough idling and black soot. Regular maintenance really helps.
That’s good advice! In addition, ensure you’re using the right fuel. Sometimes, lower-quality fuels can cause more soot.
Have you checked your fuel injectors? Dirty injectors can lead to incomplete combustion, which often results in black smoke and poor idling.
I was just about to suggest that! Cleaning or replacing them can make a significant difference.
You might also want to look into your EGR valve. If it’s stuck open or not functioning, it can cause excessive soot and rough idling.
Good point! Regular cleaning and maintenance of the EGR can help prevent those issues.
Also, check for any vacuum leaks. They can disrupt air-fuel mixture, which can lead to black soot and idling problems. Simple fix in most cases!
Exactly! I had a similar problem, and sealing a tiny leak completely changed my engine’s performance.
Don’t forget about the importance of a good tune-up! Spark plugs, ignition timing, and fuel filter all play a role in overall performance.
Right! It’s like a chain reaction. One small issue can lead to a bigger problem down the line.
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Have you thought about upgrading your engine oil to a higher quality synthetic? It can help reduce soot and improve overall engine performance.
Sounds like a smart move! I always say, you get what you pay for, especially with oil!