1. Home
  2. Automotive Technologies
  3. P0171, P0174 and scan tool readings

P0171, P0174 and scan tool readings

I have a 2005 Toyota Solara SLE, 133,000 miles, with P0171 and P0174 codes, lean mixture in both banks, and a check engine light that returns soon after being cleared.

I've cleaned and then replaced the MAF sensor, replaced the PCV valve, and listened all over for hissing. I have a constant noise in one ear, like the sound of water running in a pipe, but I still think I'd be able to hear hissing with the other ear, and even the bad one. I've also used an unlit propane torch with a hose on the end to direct propane to every place I thought there could be a vacuum leak and there are no engine-sound changes.

I think cleaning the MAF sensor actually made it run worse. The hesistation at 1mph, which was occasional, became frequent. Changing the MAF sensor didn't have any effect.

These are the sensors readings, at idle, then at 2000, 3000, and 4000rpm as best as I could hold the throttle at those places:

Below are the sensor 2 readings, I've included the Sensor 1 readings below them, but they seem less interesting. Below that are a few sets of trim readings, 2 or 3 at each rpm. I have the complete set of readings if that will help, but I thought it would make this post too long, and that intervals were easier to compare without the extra lines.

The MPH is always 0 but I could do it again with the car moving, with someone helping if need be.

Sensor 2 Live Data Engine RPM(rpm) 720 Ignition Timing Advanece for #1 Cylinder(¡£)15.0 Intake Air Temperature(¡£F)113 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.01 Absolute Throttle Position(%)16.5 OBD requirements to which vehicle is designedOBDII ===> Despite the line above, what follows are actual readings, right? Not just design requirements? Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.640 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.660 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 710 Ignition Timing Advanece for #1 Cylinder(¡£)14.5 Intake Air Temperature(¡£F)113 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.01 Absolute Throttle Position(%)16.5 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.700 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.640 Short Term Fuel Trim Bank 2-Sensor 2(%)99.279

---------------------- Engine RPM(rpm) 707 Ignition Timing Advanece for #1 Cylinder(¡£)15.0 Intake Air Temperature(¡£F)113 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.01 Absolute Throttle Position(%)16.5 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.115 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.660 Short Term Fuel Trim Bank 2-Sensor 2(%)99.28

---------------------- Engine RPM(rpm) 700 Ignition Timing Advanece for #1 Cylinder(¡£)14.5 Intake Air Temperature(¡£F)113 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.01 Absolute Throttle Position(%)16.5 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.605 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.660 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 1550 Ignition Timing Advanece for #1 Cylinder(¡£)38.0 Intake Air Temperature(¡£F)113 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.01 Absolute Throttle Position(%)18.4 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.195 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.095 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 1813 Ignition Timing Advanece for #1 Cylinder(¡£)40.0 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.02 Absolute Throttle Position(%)19.2 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.780 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.760 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 1896 Ignition Timing Advanece for #1 Cylinder(¡£)40.0 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.02 Absolute Throttle Position(%)18.8 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.095 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.760 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Numbers of DTCs 2 Engine RPM(rpm) 1895 Ignition Timing Advanece for #1 Cylinder(¡£)40.0 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.02 Absolute Throttle Position(%)18.8 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.680 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.740 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 1890 Ignition Timing Advanece for #1 Cylinder(¡£)40.0 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.02 Absolute Throttle Position(%)18.8- Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.780 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.780 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 1897 Ignition Timing Advanece for #1 Cylinder(¡£)40.0 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.02 Absolute Throttle Position(%)18.8 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.605 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.780 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 1992 Ignition Timing Advanece for #1 Cylinder(¡£)40.5 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.02 Absolute Throttle Position(%)19.2 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.760 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.760 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 2676 Ignition Timing Advanece for #1 Cylinder(¡£)45.0 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.03 Absolute Throttle Position(%)20.8 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.410 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.270 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 3073 Ignition Timing Advanece for #1 Cylinder(¡£)44.0 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.03 Absolute Throttle Position(%)20.8 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.290 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.760 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 3078 Ignition Timing Advanece for #1 Cylinder(¡£)44.0 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.03 Absolute Throttle Position(%)20.8 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.175 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.055 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 3109 Ignition Timing Advanece for #1 Cylinder(¡£)44.0 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.03 Absolute Throttle Position(%)20.8 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.485 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.055 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 3127 Ignition Timing Advanece for #1 Cylinder(¡£)44.0 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.03 Absolute Throttle Position(%)20.8 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.760 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.720 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 3169 Ignition Timing Advanece for #1 Cylinder(¡£)44.0 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.03 Absolute Throttle Position(%)20.8 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.330 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.740 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 3837 Ignition Timing Advanece for #1 Cylinder(¡£)43.0 Intake Air Temperature(¡£F)111 At almost 4000 rpm and above, the air temp has only gone down 2 degrees!

Air Flow Rate from Mass Air Flow Sensor(lb/s)0.05 Absolute Throttle Position(%)22.4 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.525 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.015 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 4180 Ignition Timing Advanece for #1 Cylinder(¡£)44.0 Intake Air Temperature(¡£F)111 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.04 Absolute Throttle Position(%)22.4 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.075 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.095 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 4180 Ignition Timing Advanece for #1 Cylinder(¡£)44.0 Intake Air Temperature(¡£F)113 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.04 Absolute Throttle Position(%)22.4 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.290 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.135 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 4199 Ignition Timing Advanece for #1 Cylinder(¡£)44.5 Intake Air Temperature(¡£F)113 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.05 Absolute Throttle Position(%)22.4 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.095 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.135 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 3716 Ignition Timing Advanece for #1 Cylinder(¡£)45.0 Intake Air Temperature(¡£F)113 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.02 Absolute Throttle Position(%)17.6 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.835 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.820 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Engine RPM(rpm) 866 Ignition Timing Advanece for #1 Cylinder(¡£)21.5 Intake Air Temperature(¡£F)113 Air Flow Rate from Mass Air Flow Sensor(lb/s)0.01 Absolute Throttle Position(%)16.5 Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.835 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.820 Short Term Fuel Trim Bank 2-Sensor 2(%)99.2

---------------------- Numbers of DTCs 2 Fuel system 1 statusCL Fuel System 2 statusCL Calculated Load Value(%)11.8 Engine Coolant Temperature(¡£F)168 Short Term Fuel Trim -Bank 1(%)-2.3 Long Term Fuel Trim - Bank 1(%)32.0 Short Term Fuel Trim -Bank 2(%)-0.8 Long Term Fuel Trim - Bank 2(%)35.2 Engine RPM(rpm) 683

What's really noticeable to me is that Short Term Fuel Trim Bank

1-Sensor 2(%) is always N/A. Even though Bank 2 Sensor 2 gives values at every interval. Does that indicate maybe that the Bank 1 sensor 2 has failed???? Could that cause the codes, even for bank 2?

I talked to the original owner, who had owned the car since it was new, and she first got the CEL in March. She took it in, they could find nothing wrong, so they turned off the light and she said the light never went on again. She has no reason to lie to me, because I'd already bought the car, and not from her. (She traded in the car to a new car dealer who auctioned it and I bought if from the guy who bought it at the auction.)

The car hesitates from 1mph. Probably not from 0 or 3mph or higher.

I'll really appreciate any help you can give.

Sensor 1 readings. From the same test, so the engine speeds are the same as above. I omitted as much as possible to make it easier to compare. Live Data Equivalence Ration (lambda)(Bank 1-Sensor 1)1.003 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.287 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.004 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.263

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.994 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.260 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.006 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.279

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.999 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.246 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.002 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.268

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)1.065 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.573 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.137 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.760

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)1.014 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.304 Equivalence Ration (lambda)(Bank 2-Sensor 1)0.949 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)2.980

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.982 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.160 Equivalence Ration (lambda)(Bank 2-Sensor 1)0.953 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.028

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.993 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.299 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.010 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.307

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.992 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.300 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.094 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.553

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)1.057 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.465 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.015 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.300

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)1.012 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.405 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.036 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.396

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)1.104 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.594 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.065 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.357

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.981 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.269 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.096 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.557

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.983 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.266 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.049 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.388

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.947 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.039 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.002 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.348

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.943 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.015 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.000 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.363

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.996 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.122 Equivalence Ration (lambda)(Bank 2-Sensor 1)0.948 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)2.910

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.983 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.244 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.004 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.253

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.909 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)2.917 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.040 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.385

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)1.191 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.825 Equivalence Ration (lambda)(Bank 2-Sensor 1)0.927 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)2.688

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.980 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.071 Equivalence Ration (lambda)(Bank 2-Sensor 1)0.906 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)2.775

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)1.088 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.407 Equivalence Ration (lambda)(Bank 2-Sensor 1)0.912 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)2.749

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)1.016 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.344 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.026 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.390

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)1.004 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.305 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.013 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.338

---------------------- Numbers of DTCs 2 Fuel system 1 statusCL Fuel System 2 statusCL Calculated Load Value(%)11.8 Engine Coolant Temperature(¡£F)168 Short Term Fuel Trim -Bank 1(%)-2.3 Long Term Fuel Trim - Bank 1(%)32.0 Short Term Fuel Trim -Bank 2(%)-0.8 Long Term Fuel Trim - Bank 2(%)35.2 Engine RPM(rpm) 683

Trim readings Fuel system 1 statusCL Fuel System 2 statusCL Calculated Load Value(%)12.2 Engine Coolant Temperature(¡£F)150 Short Term Fuel Trim -Bank 1(%)7.8 Long Term Fuel Trim - Bank 1(%)32.0 Short Term Fuel Trim -Bank 2(%)7.8 Long Term Fuel Trim - Bank 2(%)35.2

Calculated Load Value(%)11.8 Engine Coolant Temperature(¡£F)149 Short Term Fuel Trim -Bank 1(%)9.4 Long Term Fuel Trim - Bank 1(%)32.0 Short Term Fuel Trim -Bank 2(%)8.6 Long Term Fuel Trim - Bank 2(%)35.2

Calculated Load Value(%)11.8 Engine Coolant Temperature(¡£F)149 Short Term Fuel Trim -Bank 1(%)7.0 Long Term Fuel Trim - Bank 1(%)32.0 Short Term Fuel Trim -Bank 2(%)9.4 Long Term Fuel Trim - Bank 2(%)35.2 ....

Calculated Load Value(%)11.8 Engine Coolant Temperature(¡£F)150 Short Term Fuel Trim -Bank 1(%)14.8 Long Term Fuel Trim - Bank 1(%)32.0 Short Term Fuel Trim -Bank 2(%)18.8 Long Term Fuel Trim - Bank 2(%)32.8 Engine RPM(rpm) 1813

Calculated Load Value(%)12.2 Engine Coolant Temperature(¡£F)150 Short Term Fuel Trim -Bank 1(%)10.2 Long Term Fuel Trim - Bank 1(%)32.0 Short Term Fuel Trim -Bank 2(%)5.5 Long Term Fuel Trim - Bank 2(%)32.8 Engine RPM(rpm) 1896 ...

Calculated Load Value(%)14.9 Engine Coolant Temperature(¡£F)158 Short Term Fuel Trim -Bank 1(%)-12.5 Long Term Fuel Trim - Bank 1(%)32.0 Short Term Fuel Trim -Bank 2(%)-4.7 Long Term Fuel Trim - Bank 2(%)32.8 Engine RPM(rpm) 3073

Calculated Load Value(%)14.1 Engine Coolant Temperature(¡£F)158 Short Term Fuel Trim -Bank 1(%)-5.5 Long Term Fuel Trim - Bank 1(%)32.0 Short Term Fuel Trim -Bank 2(%)-7.8 Long Term Fuel Trim - Bank 2(%)32.8 Engine RPM(rpm) 3078

Calculated Load Value(%)14.5 Engine Coolant Temperature(¡£F)159 Short Term Fuel Trim -Bank 1(%)-13.3 Long Term Fuel Trim - Bank 1(%)21.1 Short Term Fuel Trim -Bank 2(%)-10.9 Long Term Fuel Trim - Bank 2(%)32.8 Engine RPM(rpm) 3109 .....

Calculated Load Value(%)16.1 Engine Coolant Temperature(¡£F)167 Short Term Fuel Trim -Bank 1(%)5.5 Long Term Fuel Trim - Bank 1(%)18.0 Short Term Fuel Trim -Bank 2(%)4.7 Long Term Fuel Trim - Bank 2(%)32.8 Engine RPM(rpm) 3837

Fuel system 1 statusCL Fuel System 2 statusCL Calculated Load Value(%)14.5 Engine Coolant Temperature(¡£F)167 Short Term Fuel Trim -Bank 1(%)-7.8 Long Term Fuel Trim - Bank 1(%)32.0 Short Term Fuel Trim -Bank 2(%)18.8 Long Term Fuel Trim - Bank 2(%)32.8 Engine RPM(rpm) 4180

Calculated Load Value(%)13.7 Engine Coolant Temperature(¡£F)168 Short Term Fuel Trim -Bank 1(%)0.0 Long Term Fuel Trim - Bank 1(%)18.0 Short Term Fuel Trim -Bank 2(%)10.9 Long Term Fuel Trim - Bank 2(%)32.8 Engine RPM(rpm) 4180

Reply to
micky
Loading thread data ...

On that car, with that combination of codes, 99.9% you have an intake leak. 0.1% remaining, it's a bad primary O2 sensor.

Just saying - Pull the manifold and replace all of the seals. Common problem

Reply to
clare

What are the O2 sensor(s) readings? Can your scanner read or map the O2 voltages? If not then use your dvm on the leads. Check when HOT! 2k-3k rpm.

Reply to
Paul in Houston TX

Darn, but okay.

If it takes another 3000 miles before I get this done, am I likely to hurt the engine or cat or anything?

Reply to
micky

I think this is what you mean:

Equivalence Ration (lambda)(Bank 1-Sensor 1)1.065 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.573 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.137 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.760

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)1.014 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.304 Equivalence Ration (lambda)(Bank 2-Sensor 1)0.949 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)2.980

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.982 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.160 Equivalence Ration (lambda)(Bank 2-Sensor 1)0.953 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.028

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.993 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.299 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.010 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.307

---------------------- Equivalence Ration (lambda)(Bank 1-Sensor 1)0.992 Oxygen Sensor Voltage (Bank 1-Sensor 1)(V)3.300 Equivalence Ration (lambda)(Bank 2-Sensor 1)1.094 Oxygen Sensor Voltage (Bank 2-Sensor 1)(V)3.553

----------------------

So what they call voltages are more than zero and less than 12, and go up and down around 3.1 to 3.6. So does that imply they are good?

I was going to take the connector apart and measure the resistance, but it looked like I had to take off the air intake "funnel" first, and then, it seems, the car started working right!

Reply to
micky

I went back and reread your original post. All the numbers were there. I was my mistake for overlooking them. The numbers look just fine. A bit on the rich side but that is probably due to the low engine temp ~150F. Don't really see anything wrong.

Reply to
Paul in Houston TX

Technically they oscillate between 0 and 5. The wider the swing the better.

Reply to
clare

OOPS!!! normal O2 sensor between 1 and zero, late model Toyotas (with wide band O2 sensor) 0 to 3.3

Reply to
clare

That's good. There must have been some vacuum leak, and I suppose it will reappear**.

What I should do is use the scan tool to get the same sort of readings when it's working right, and maybe I can find one or more values that are different from when it was working wrong, and maybe if/when it starts working wrong again, someone can sit in the car watching just that/those values, and when I fiddle with the right hose, or blast the right 02/fuel sensor, he's see the change and tell me.

**After all, it showed up in March when the previous owner had it, then in October. The mechanic who looked at in March might have touched the same hose or whatever I touched. Actually, the CEL and the VSC and Trac*** lights were all on and they all went off a day or two after I bought the car. Then when I was playing with the transmission, putting it in first gear to go down a steep but short hill, the light went on and it's been on almost all of the time since then. ***The owners manual says that the Trac (Off) light will come on when the VSC light is on. But still, maybe I should have mentioned the other two lights. I apologize, although I was only hurting myself.

I think this was a very good thread. Even if what I learned didn't directly fix the car, I still learned a lot.

Reply to
micky

Unless it was partly clogged injectors and the Techron cured it, at least for 2 or 3000 miles.

Reply to
micky

Right. And as someone else here pointed out, it's likely on the intake gaskets because they are a known problem on those engines.

Well, just watching the readings should be sufficient. If you manage to block the leak or get propane into the leak instead of air or the like, the numbers will change immediately and obviously and then return back once you remove your hand or the propane torch from the leak.

But you also know that the intake gaskets are bad, and if they aren't causing this problem, they are likely going to cause another.

--scott

Reply to
Scott Dorsey

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.