How can you diagnose carbon fouled spark plugs?

Nov 11, 2017 ... ... spark plug gets a lot of carbon build-up. Any ideas please because i'm running all sorts of tests and cannot find the cause. Thanks in ... May 3, 2014 ... Prevent spark plug fouling due to oil & carbon build-up. Image. Save ... I fouled out another set of plugs, What would cause this, Tried adjusting ... Apr 8, 2004 ... the plugs are dry black "coated" the engine begins to miss, can take spark plug wires off and no noticable change in idle acceleceraton. the egr ... Oct 24, 2015 ... Pulling the plugs, all four plugs are identically and evenly coated with a dry dusty heavy black carbon that cleans easily with a wire brush. I ... Seems to be where it wants to run but plugs still foul (dark black carbon). Jets appear to respond to the lean/rich process and I think they are where they ... Aug 15, 2006 ... ... causing carbon fouling is your air filter clean and free of oil? If its in bad shape it could be restricting air flow enought to leave your ... May 31, 2011 ... The carb is new out of the box and it was making all the plugs black carbon. ... dont use the old lead fuel pic s of spark plugs to read ... Apr 13, 2023 ... The unburnt carbon will be deposited on the spark plug, causing carbon build-up. ... Every car has an oxygen sensor, which monitors the air and ... Aug 18, 2001 ... Rich mixture and or rich main jets can cause the carbon/plug problem but if its really bad enough to cause a problem you should see black smoke. Clearing a Fouled Spark Plug. Featuring Bob Nardiello. Subscriber question: "What is the most likely cause of a bad magneto check during run-up (too large a ...