Can carbon fouled spark plugs cause a vehicle to fail an emissions test?

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 ... Apr 12, 2013 ... ... cause the plug tip temperatures to decrease and carbon deposits to accumulate, possibly causing fouling and misfires). A solution to this ... Mar 31, 2010 ... It is possible to foul a spark plug when running it at the proper temp. range, but it isn't very common. One good example would be oil fouling. Apr 29, 2012 ... Thanks Jim. I'll check the air control cable. That sounds like a likely cause. There seemed to be good tension at the lever but of course that ... Carbon-fouled. Ash-fouling. Ferrocene. Oil-fouled. Partially melted center ... Cause: Spark-plug replacement interval not complied with. Effect: Misfiring ... ... carbon fouled, but the other plugs were normal (according to my plug chart). What could be causing plug #1 to carbon foul? -- bad plug? incorrectly set ... The causes for such a buildup include a heavy carburetor float, a leaky injector or carburetor needle valve, malfunctioning of the spark plug wires, or ... Jul 6, 2015 ... What bike? Forget the electronic ignition for now. Get it right first, otherwise you are introducing new variables. Carbon fouling is a result ... Jul 28, 2014 ... ... fouled plugs are more likely to be caused by a fuel problem than an ignition problem." What do you mean by this? If the bike if performing ... Aug 15, 2006 ... ... spark plugs on the L/H side.. ... If that injector is defective and either sticking open or leaking, it could be the cause of your fouled plug as ...