Having the High BLM issue (stuck at 150) and it has recently started happening. Have had the car about 15 years and haven't had to deal with it before. Its a california car so i have had to have it smogged every 2 years and not had any issues. Car had been running great up to this point. I've gone over the basic stuff. I've attached an image of the power logger console after starting it up. Seems to be stuck in Cell 0 only. Looked for vacuum leaks and couldn't find anything. Tried to take it to a mechanic and all they could find was the Ignition Control Module needed to be replaced which they did with an AC Delco one. That still did not solve the issue. I'm left with trying to figure this one out myself. Any ideas or things to try? Thought it might be the stock MAF and tried replacing with a blue streak one but does the same thing. Reading below is with the bluestreak MAF. i'm currently running the stock chip. My turbo tweak chip was also doing the same thing so i haven't swapped it back.
Replaced O2 sensor
Replaced Fuel Filter
Replaced PCV Valve
Spark Plugs (the ones pulled you could tell its been running rich)
Fuel Pump was replaced about 8 years ago with hotwire
Replaced O2 sensor
Replaced Fuel Filter
Replaced PCV Valve
Spark Plugs (the ones pulled you could tell its been running rich)
Fuel Pump was replaced about 8 years ago with hotwire