Diagnose for Bad O2 Sensor on '87 Max
I am trying to find out if I have a bad O2 sensor on my '87 Max to fix my poor fuel mileage problem, which is 15 mpg city. I have fixed the cyl head temp sensor connection and the ECM now properly flashes the 44 code that is working OK. I measured the O2 sensor output voltage and get .23 -.77 V with crosscount cycle rate at about 1 sec. Unplugging a vacuum line to create a lean condition it gets .19 V and with a quick response under half a second. It's hard to get exact measurement because I am using a DVM and not an oscilloscope. For this year Max does the crosscount voltage and cycle rate look OK?
87 GXE All Original, 2nd Owner - Dad 1st Owner