OK, so I've already posted about my recently O2 Sensor codes that I've been getting with my 89 Cutlass(2.8L), but now there's more to the story.
First, I was getting a code 45, indicating a RICH exhaust. No big deal. I have an AutoMeter Air/Fuel Gauge installed and can literally sit there and watch the LED "stuck" in the RICH and not moving, so it was no surprise to me.
Then I decided to double check my OBD codes again and I saw I was also getting a code 44. No big deal again. I just figured that my O2 was getting slow and "lazy". I replaced it a year and a half ago and it's probably time for a New one.
Now for the past few days, I've gotten code 45 about 10 times or so. It would be "no big deal" again, BUT, I realized that it always happens when I'm idling at a STOP or in PARK!!?? So what? Well I remembered reading that the one of the criteria for a code 45 to be set is throttle is between 3 and 45 percent open!!!!
Why in the heck is my ECM setting a code 45 and turning on the SES light if my throttle is completely CLOSED!? I'm at 0% NOT 3-45%!?
I guess it COULD somehow be my TPS but I used to always use a Snap-On Scanner(borrowed) and my TPS was always working perfectly and would show "0%" at idle.
So if it's NOT my TPS, what else could it be?? Could the ECM itself be screwed? I mean I KNOW that my O2 is stuck RICH when I'm idling, but still, the ECM shouldn't be setting a code 45 unless I'm at least 3% on the throttle...
Anyone?
THANKS!:)