58 psi is not going to make run rich! have you checked VALVE LASH? 1. if your valves are not to tight .006 intake .008 exaust with the engine cold.2.check your timing3. do a compression test.........
1. not all hondas have the same valve lash settings.
2. if timing is off he will have more problems than just running rich.
3. a compression test is not going to point him in the direction of where the extra fuel is coming from. he said ALL of the plugs were black. if he were down on compression (most likely in 1 cylinder if any) then there would be an oddball looking plug out of the 4.
58 psi at idle WILL make a motor run rich, regardless of the setup. thats just too much pressure at idle. too tight of valves may also make you be down on compression in whatever cylinder the lash has tightened up, but a compression test will not reveal this. to find that out you have to do a leak down.
keep on track with the fuel system. it sounds like theres a bug in there somewhere. o btw. im running 3 fuel pumps cuz im uber jdm tyte yo!