Can carbon buildup on intake or exhaust valves affect engine performance and spark plugs?

Sep 9, 2017 ... ... what's causing this for ages and I'm having no luck. I own a 2001 Mx5/Miata and the car is without a doubt running richer than it should (I ... 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 ... Jul 14, 2021 ... Common types of fouling include lead, carbon, silica, loose debris, and oil. Another common cause of spark plug failure is a cracked ceramic ... A poorly performing fuel pump can cause spark plugs to foul. The plug will have a dusty layer of black carbon deposits. Jun 2, 2021 ... Could it be that an excessively rich idle mixture causes carbon fouling, then the lack of spark allows oil to accumulate? I just want to be ... May 23, 2022 ... ... spark plugs, they foul badly with black carbon after only 20 ... fouling, I was hoping to rule out the original Strombergs causing the issue. 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. May 13, 2021 ... Carbon fouling on a spark plug is caused by a problem with the fuel that you use. Often, we describe it as a fuel mixture that's too rich, which ... 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 ... Jun 7, 2016 ... If you ride fast, using a lot of engine speed the hotter spark plugs can cause pre-ignition (pinging), so you'll have to use your own judgment ...