I got a 1992 civic cx with the stock d15

i think it running rich because:
-when its running it smells like it (kinda like a dirtbike)
-its running a little cooler than usual
-its getting relatively poor gas milage

A rich fuel/air mix is the only thing i can think would cause this, agree? other ideas?

if so, is it possible to adjust that? i couldnt find anything with search or my hayes

 

More than likely means u have a intake leak/exhaust leak before the o2 sensor..or possibly a vaccum leak....so time to do some testing

 

Any vacuum leaks would make a car run lean.You gotta put a scanner on to really see what's going on.

 

Replace the thermostat and then go from there.