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
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...