How can a cylinder leak-down test help pinpoint the source of fouling?

Jan 26, 2009 ... * Carbon fouling: Your spark plug will have a black look, and will ... The cause of this type of foul could be caused by a number of ... Sep 25, 2015 ... Cylinders 2-5 looked normal. What could cause the end plugs to foul? My thought was those plugs stay cooler, and not hot enough to burn off ... Jan 15, 2023 ... What might've caused this engine to be carbon fouled so badly? It ... spark plugs afterwards. Both can be significantly impacted after ... 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 ... 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 ... Aug 20, 2006 ... What would cause the front cylinder spark plugs to foul heavily with carbon on my 2002 VTX 1800C? The rear cylinder plugs were ok. Sep 26, 2022 ... Carbon Fouled Spark Plug – Find Causes & Solutions · A dirty air filter · Faulty fuel injector · Too rich air mixture · Failed oxygen sensor. Dec 14, 2022 ... I would download ISTA and get the codes that causing the DTM. Post them here. Did you torque the spark plugs when you installed new ones? Or did ... 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 ... Apr 27, 2008 ... If this is indeed my problem (weak ignition) . does anyone have any recommendations for fix/replace?