240sx running rich

[DaRussian]

Stock KA24DE ? What kind of Valves did you use ? OEM Stock ? Aftermarket ?

Plain and Simple, it's unburnt fuel. Running way too rich, check if you got any oil leaks around. Might help if you lift the car up somewhere around a local shop. Check if Oil is entering an Area that is not allowed. Like for example, Spark Plug chambers. Plus when you replaced your valves, did you use a new valve cover, and head gasket, it can be a stressed valve cover gasket, or maybe a stressed head gasket.

240atlanta.com
zilvia.net
240sx.org

ask around those websites. l8r man.

i got a new head gasket and old valve cover.