90Mustangfan

If the O2 sensor isnt grounded will they still work.....I think I found the problem for codes 41 and 91...Im almost positive that my O2 sensors ground wire inst hook up...from the salt and pepper connectors....Heres my theory...THe car runs great and idles great, but when it warms up after like 15 min, then the idle will surge,and the rpm go from 800-600 bouncing and surging...this is because the O2 sensors should work in open loop and there not, so thats why my car runs good at the start up till its warm. then when the O2 sensors are needed, and they dont work , so the idle gets sh*tty...does this sound right????

schwindty

Well if the wires aren't grounded thats for surely one of the problems, other than that do the usual stuff like cleaning the IAC and EGR Valve is you have one. But my guess is the O2 sensors, you know how to check if they are getting ground?