Hey guys, reasonably new to the forum so G'day to everyone! Been into skylines for about a year now I sold my gts-t for a neat stock rb20det gts-4 but I'm stuck with a problem. I didnt pick it up at first but driving it the engine runs smooth but seems to be running really rich, there is a strong smell of fuel and bit of black smoke from exhaust when i rev it... and what appears a little bit of fuel or water from exhaust when its revved.
Apparantly the catalytic converter is screwed but I'm guessing that would be because its been running so rich to start with? Can anyone help me diagnose how it could be over fueling?! I am not really mechanically minded but I can suggest maybe faulty fuel pump, o2 sensor, engine management, injectors? but I have no idea how to trouble-shoot this or find out which one of those if any could be the problem. Any help would be appreciated!