2 Problems / Need help with

[rn240sx]

1st is the a/f mixture at idle. At 1st is was fine, the afc would be set at zero at 1000 rpm and my a/f mixture on the wideband would read 14-15After a while it started to lean out to the 17's and the idle got a bit rough, so i tunned the afc +20 % to get it back up to 14-15.Now the a/f mixture is reading 18-19 and idle is just horrible. SO i tunned the afc up more to 40% to get the a/f mixture back up to 14-15 again..Now i have the afc at 50% to keep it stable at 14-15... Im sure its gonna get worse and i dont know what is going on here... Im not sure if this is O2 sensor related or not, but i have a bosch wideband O2 with narrowband output to feed the ECU to make it think there is still an oem O2 sensor. And the sensor is mounted about ~15 or so inches from the turbine propeller...

2nd problem i have is the coolant temps. At 1st i could be cruising at 40-75 mph and the temps would stay at ~195 deg. Come to a stop and the temp goes up and the fans kick over at ~203 and cool it down... Like its supposed to. Now its got to the point where no matter what speed i go 40-85 mph and the coolant temps would rise to 203 and the fans kick on, cool it down, fans go off... and then again the temps would go up and fans would kick on and so forth. It does this ALL the F***ing time. While im steading crusing on the hwy.. i can watch the temps go up, fans kick on, temps go back down and its a continuous cycle back and forth. I know for a fact this should NOT be happening. The temps should stay solid while cruising until i come to a stop, then they should rise like normal... My guess would be the radiator. For some reason the only thing that seems to bring the temps down are the fans... not all the hwy air flow passing thru it.

B4 anyone jumps to conclusions... This same motor with same thermostat and water pump was in my last S14 and i didnt have these rising temp problems, which leads me to believe its the radiator. All this started when i swapped this motor into this S14...But I thought i would ask u guys to get some opinions....

THANKS GUYS....
Modified by rn240sx at 9:39 PM 6/26/2005