What are some common diagnostic procedures that mechanics use to identify the cause of spark plug fouling?

Nov 24, 2020 ... Having a bit of a problem with carbon fouled spark plugs on my 1955cc engine in a split bus. It had an external oil cooler and never seems to get very hot. Nov 28, 2022 ... I just changed my own spark plugs, and it seems they are Carbon fouled. ... I don't think the condition on these plugs would cause any harm to the ... Carbon fouling is an indication of a rich air-fuel mixture, weak ignition, or improper heat range (too cold). Carbon deposits are conductive and can create a ... Jun 13, 2023 ... I have 1 cylinder in my 1970 440 that carbon fouls, almost positive its a valve issue. All other plugs still look great. (Bosch Platinums). Bad or fouled spark plugs can cause a range of issues for your engine ... While fouled spark plugs can sometimes be cleaned, heavily coated oil, carbon ... Jun 6, 2011 ... Usually fouling is caused by too rich a mixture or weak spark, afaik. I think getting the right adjustments on the carbs, ensuring the proper amount of spark. Nov 12, 2020 ... The most common reasons why a lawn mower spark plug fouls are listed below: Air Intake blockage (this could be caused by the choke being left ON ... Apr 27, 2008 ... If this is indeed my problem (weak ignition) . does anyone have any recommendations for fix/replace? Jun 21, 2004 ... If the plugs are fouled with a fluffy carbon black, your mixture is too rich. ... Possible causes: misfire, too cool, thermostat, plugs too ... Mar 8, 2012 ... I just thought it was running too rich and causing the carbon buildup on the plugs and then they couldn't ignite the fuel mixture anymore after ...