Re: slow start and running rich 94
My 1994 D90 has a couple of nagging issues. The first is the slow starting issue. It seems like it's starved for fuel a bit, and always starts on the second crank. Injectors are recently rebuilt and have plenty of juice from the battery (had it tested and it's good).
The other issue is that my truck seems to be running seriously rich (tail pipe is black and lots of condensation). I replaced the exhaust system a few months ago (with cats and all), but did not replace the O2 sensors. What are the symptoms of needing O2 sensors replaced? Any other potential sources of this issue I should look at? No warning lights on the dash at all.