Cbitz233 Posted September 23, 2018 Report Share Posted September 23, 2018 So pulled my exhaust manifold and notice what looks like one of my valves is possibly burnt. It's black and the wall around it is black. The other 3 just have normal carbon deposits. Is this possible case of burnt valves? Link to comment Share on other sites More sharing options...
PackardV8 Posted September 23, 2018 Report Share Posted September 23, 2018 Burned valves are more likely to be red than black. Black color is an indication of ignition or carburetion problems causing incomplete combustion or a rich mixture. A burned valve can best be confirmed by a compression test and a leakdown test. Run a compression test on all cylinders. If one is low, then run a leakdown test and listen for where the air is going out. jack vines Link to comment Share on other sites More sharing options...
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