How do leaky valve seals contribute to carbon deposits on spark plugs?

Sep 1, 2020 ... ... caused the engine to run really rich, which ultimately caused the carbon-fouled spark plugs. Does this sound at all plausible? I don't know ... 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 ... Jun 11, 2015 ... ... spark plugs to use to avoid fouling? Back to Top. Direct Link ... So hotter plugs and carbon deposits could cause you pre-ignition and ping. Dec 15, 2008 ... And if the O2 sensor was bad, would that even cause it to be hard to start? The carbon fouling could have happened due to the plugs firing ... Jun 25, 2013 ... Carbon fouling occurs when the spark plug firing end does not reach the self-cleaning temperature of approximately 450°C (842°F). Carbon ... Jan 31, 2020 ... Gentlemen, I have a sooty, carbon-fouled spark plug problem that I ... carbon building up on the exhaust valves causing them to leak. Aug 4, 2010 ... ... abnormally rich mixture, which tends to cause the sooting and fouling of the front spark plugs with carbon. As soon as enough soot from too ... May 12, 2006 ... ... carbon, fuel, oil or other deposits; Will cause spark to leach to metal shell...no spark across plug gap will cause a misfire; Wet-fouled ... 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 ... 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 ...