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check engine light at idle

  

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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? 

 

 


2 Answers
1

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

 


0
Topic starter

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. 😫 


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