I am completely turned around and lost right now.
I have a 1997 Toyota Camry with the 4cyl 2.2L automatic transmission.
I went to go get it smogged and it passed all but the emission from the tailpipe. My CO was sky high and HC was a little high. Mechanic said it was because car is running rich for some reason.
I have been running through all the issues and sensor and can not seem to locate the issue.
Here are my fuel trims at idle:
-5.5% Short Term
13.3% Long Term
and whats weird is the short moves around a little form 0% to -5.5% however the long term seems to be locked at 13.3%
Also, when applying around 1500RPM the long term actually gets worse and goes up to 15.3% (therefore not a vacuum leak)
Here is the part I'm completely lost about...
My upstream O2 sensor is pretty much flat reading 0.65v all the time... It doesn't oscillate rich-lean-rich-lean at all..
So I just assumed my O2 must be bad/lazy. I swapped with a known good O2 and it still is completely the same... reading 0.65v constantly pretty much.
My downstream is readding a pretty consistent 0.56v
The wiring to the o2 looks great. It's a known-good sensor. Just not sure what the hell is going on....
Things I've done:
Tested & Confirmed: MAP
Tested & Confirmed: No Vacuum Leaks
Tested & Confirmed: EVAP Purge Valve
Tested & Confirmed: Fuel Pressure
Tested & Confirmed: Air Filter
Tested & Confirmed: Spark Plugs
Cleaned: Throttle Body
Cleaned: Idle Air Control Valve
Replaced: PCV Valve
Replaced: PCV Hose
What am I missing? Care runs fine and seems normal. Just it's running rich I believe and therefore can't pass smog