black smoke

[Veil240]

I have a 89 240 with an SR20DET motor and when I start it up it does not idle well. also when it gets warmed up black smoke comes from the exhaust. Does anyone know what could cause this?

[drifter808]

had the same problem and my timing was off. now it works great after i adjusted it.

[SHIFT_control]

You are running very rich. Try adjusting your timing. If timing is ok check the 02 sensors. After the 02s, check the mafs. Also a list of mods (if any) will help to try and narrow it down.