Code 16 on a '91 Civic
 

This problem has been driving my nuts for awhile. I've changed the
injectors. What happens is that the check enigine light comes on (the
code 16) and if the car is idleing for 5 minutes it starts smoking,
floods out and dies. Sometimes it'll die at a stop sign too. No amount
of cranking will clear it and allow it to start. If I pull the wires to
the injectors it'll clear the flooded condition and start right up. I
hate to replace the ECU and find that the condition is caused by some
sensor. So, I guess my question is; is there some sensor that can cause
this problem and what's the test proceedure for the sensor. BTW, it's a
1.5l DPI engine.

Thanks for any help.