2008/ Toyota /Corolla/ 185,000 Miles/ Automatic/ P0171 - Used Car
Hello,
I have been trying to figure out the issue with my car, but I just can't seem to figure it out. I have OBDII scanned the car and checked the freeze frame data. I got a check engine light at idle (0 MPG). I tried to do what my odbII recommended (changed the MAF sensor and engine intake gasket) but it does not seem to fix the issue. I have also invested in a smoke leak detector to try to find a vacuum leak, but I did not find any. The only damaged seemed to be my air box (it has cracks in it), however I am not sure if this can cause a vacuum leak. I have all my odb live data and freeze frame data, I will leave below.
FREEZE FRAME
--------------------
Fuel Sys 1 (CL)
Calc Load (43.5%)
Short term fuel trim (4.7%)
Long term fuel trim (39.8)
Veh Speed (0 MPH)
Eng RPM (650)
MAF 0.24 (lb/min)
TPS 16.1%
O2S B1 S2 0.055v
STFT B1 S2 99.2%
Lambda B1 S1 0.997
02S B1 S1 3.288 V
02S B1 S1 0.00 mA
EQ ratio 1.004
------------------------------------------LIVE DATA
MAF stay around 0.181 lb/min at idle 650 rpm
LTFT 43% at idle
STFT -1.563 to -2
o2 B1S1 Voltage 3.241 v
02 B1S2 Voltage 0.6 to 0.7 V
If you need any more info please let me know?
Your long term fuel trim is crazy high. That poor thing is desperately trying to push more fuel through. See possible causes here:
https://www.obd-codes.com/p0171
I know, it drives me crazy. I literally at a loss. The only thing I have left to do is change the pcv valve or just go ahead and change most of the tubing. 😫