Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
2001 ford 7700 5.4 p0174 code. Smoke tested, repaired vac lines, saw some smoke coming out out from under mushroom top of egr, i replaced it.Replaced pvc and rubber piece behind the intake for good measure. I cleared the code, drove for about 150 miles, checked for codes again, p0174 was pending. Needed to have it inspected for registration. Took it in, and it passed. Check engine lite came back on after driving bout another 50 miles.
I checked freeze frame data. under load was around 75, idle bout 680, short and long term fuel trims, bank 1, -2 to +5. Bank 2 fuel trims,short term +4 apprx. long term +29. Checked the long term while driving, would be around +19 to+21. Haven't replaced fuel filter, figured if it was it, it would throw the p0171 also.
So can anyone suggest anything else?
OK, just did a smoke test again. Found smoke coming out around the piece that the pvc elbow attaches to behind the throttle body, don't know what it is. Could this be the culprit?
If ignorance is blessed, i got to be happy!!!1
Last edit: 6 years 3 months ago by Huckleberry. Reason: adding more info
Ok idle seems a little low next we need to do a wide open throttle run in 1st gear and see what its peak is . Also if you can get load on that same run and b1s1 and b2s1 oxygen sensor make sure they go full rich approx 800mv the whole time your foot is on the floor.
Ok Ben. Flooring it in first gear.
Readings:
Rpm: 4507
Maf: 199.2
short term FT b1: 17.2
long term FT b1: 0.0
short term FT b2: 18.0
long term FT b2: 1.6
02b1s1: 0.925
02b2s1: 0.855
Did a smoke test a couple weeks ago, found a couple leaks.Things i've changed: fuel filter, pcv, egr( had smoke coming out from under the mushroom lookin cap), repaired some vacuum lines, replaced boot on back side of throttle body.
Yesterday did another smoke test, had smoke coming out of the IAC where the lil round piece is on the side of it.
By the way, thanks for your help.
Ok maf is right on oxygen sensors look good and suggest were not lacking fuel, however are short term fuel trims say were lean on both banks at that rpm but are long term hasn't compensated for it yet. What was the freeze frame for the code was it at idle rpm or driving hot or cold? Does this engine have manifold/exhaust leaks?
Ok, after further inspection, no change. long fuel trim b2 +29.7. Smoked again, have some smoke coming from back of throttle body still, in the area of the pvc elbow and iac. Can't tell which one is leaking, or even if they are. I have replaced both. Could there be a leak back there from throttle body? Is there a port from intake manifold underneath that area? I've looked and can't tell without removing a some things. I also did the water test there with no results. Also yesterday i had a 442 code pending(evap) UGH!
I just confirmed the iac is leaking when i smoked it. Is it suppose to? It's new.
what was the intake air temp reading when you did the w.o.t. test?? i ran the volumentric efficiency test otc has and put 75 degrees and its only coming out to 70% which is low. every class i been to 75 is the minmum they want you to see.
Roughly what temperature was it in your area at the time of your wide open throttle run ? Does this truck have a exhaust leak (common for studs to break) does this truck have a misfire? May pull the plugs on bank 2 and see what they look like. Does your scan tool do injector pressure drop testing? Does the truck lack power ?
Temp probaly in the 50"s. As for as the exhaust leak,? Can't hear a leak as well as sprayed lil soap and water at the joint. However, the muffler has a small hole in it, cause i notice after starting and letting it idle a lil while, seems to have an abnormal amount of condensation coming out from the exhaust pipe and that small hole. I can feel a slight hiccup in the idle. Doesn't lack power. My scan tool doesn't have the injector testing feature. I'll pull plugs tomorrow. Overall truck runs great, it's just that long term fuel trim is bugging the crap out of me.
OK changed driver side plugs. Recorded WOT on scan tool. Here's my readings. Outside Temp, about 60
Numbers of DTCs 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated Load Value(%)23.1
Engine Coolant Temperature(¡£C)96
Short Term Fuel Trim -Bank 1(%)-1.6
Long Term Fuel Trim - Bank 1(%)-14.1
Short Term Fuel Trim -Bank 2(%)-2.3
Long Term Fuel Trim - Bank 2(%)10.9
Engine RPM(rpm) 790
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)13.5
Intake Air Temperature(¡£C)23
Air Flow Rate from Mass Air Flow Sensor(g/s)26.02
Absolute Throttle Position(%)78.4
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.720
Short Term Fuel Trim Bank 1-Sensor 1(%)17.2
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.650
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.080
Short Term Fuel Trim Bank 2-Sensor 1(%)17.2
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.630
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII
Numbers of DTCs 0
Fuel system 1 statusOL-Drive
Fuel System 2 status--
Calculated Load Value(%)99.2
Engine Coolant Temperature(¡£C)95
Short Term Fuel Trim -Bank 1(%)17.2
Long Term Fuel Trim - Bank 1(%)0.0
Short Term Fuel Trim -Bank 2(%)17.2
Long Term Fuel Trim - Bank 2(%)0.0
Engine RPM(rpm) 2825
Vehicle Speed Sensor(km/h)36
Ignition Timing Advanece for #1 Cylinder(¡£)9.0
Intake Air Temperature(¡£C)23
Air Flow Rate from Mass Air Flow Sensor(g/s)128.51
Absolute Throttle Position(%)93.3
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.860
Short Term Fuel Trim Bank 1-Sensor 1(%)17.2
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.845
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.785
Short Term Fuel Trim Bank 2-Sensor 1(%)17.2
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.810
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII
Numbers of DTCs 0
Fuel system 1 statusOL-Drive
Fuel System 2 status--
Calculated Load Value(%)100.0
Engine Coolant Temperature(¡£C)95
Short Term Fuel Trim -Bank 1(%)17.2
Long Term Fuel Trim - Bank 1(%)0.0
Short Term Fuel Trim -Bank 2(%)19.5
Long Term Fuel Trim - Bank 2(%)0.0
Engine RPM(rpm) 4550
Vehicle Speed Sensor(km/h)62
Ignition Timing Advanece for #1 Cylinder(¡£)13.5
Intake Air Temperature(¡£C)21
Air Flow Rate from Mass Air Flow Sensor(g/s)194.46
Absolute Throttle Position(%)93.3
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.870
Short Term Fuel Trim Bank 1-Sensor 1(%)17.2
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.880
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.845
Short Term Fuel Trim Bank 2-Sensor 1(%)17.2
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.885
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII
Numbers of DTCs 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated Load Value(%)20.8
Engine Coolant Temperature(¡£C)95
Short Term Fuel Trim -Bank 1(%)-13.3
Long Term Fuel Trim - Bank 1(%)-10.9
Short Term Fuel Trim -Bank 2(%)-10.2
Long Term Fuel Trim - Bank 2(%)24.2
Engine RPM(rpm) 852
Vehicle Speed Sensor(km/h)45
Ignition Timing Advanece for #1 Cylinder(¡£)15.5
Intake Air Temperature(¡£C)21
Air Flow Rate from Mass Air Flow Sensor(g/s)6.64
Absolute Throttle Position(%)20.0
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.095
Short Term Fuel Trim Bank 1-Sensor 1(%)-13.3
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.865
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.100
Short Term Fuel Trim Bank 2-Sensor 1(%)-4.7
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.895
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII
Numbers of DTCs 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated Load Value(%)24.3
Engine Coolant Temperature(¡£C)95
Short Term Fuel Trim -Bank 1(%)-15.6
Long Term Fuel Trim - Bank 1(%)-15.6
Short Term Fuel Trim -Bank 2(%)-11.7
Long Term Fuel Trim - Bank 2(%)25.0
Engine RPM(rpm) 620
Vehicle Speed Sensor(km/h)20
Ignition Timing Advanece for #1 Cylinder(¡£)17.5
Intake Air Temperature(¡£C)21
Air Flow Rate from Mass Air Flow Sensor(g/s)6.58
Absolute Throttle Position(%)20.0
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.075
Short Term Fuel Trim Bank 1-Sensor 1(%)-11.7
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.855
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.525
Short Term Fuel Trim Bank 2-Sensor 1(%)-10.9
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.885
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII
Numbers of DTCs 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated Load Value(%)25.5
Engine Coolant Temperature(¡£C)95
Short Term Fuel Trim -Bank 1(%)-8.6
Long Term Fuel Trim - Bank 1(%)-12.5
Short Term Fuel Trim -Bank 2(%)-3.9
Long Term Fuel Trim - Bank 2(%)21.1
Engine RPM(rpm) 720
Vehicle Speed Sensor(km/h)11
Ignition Timing Advanece for #1 Cylinder(¡£)18.0
Intake Air Temperature(¡£C)21
Air Flow Rate from Mass Air Flow Sensor(g/s)6.69
Absolute Throttle Position(%)20.0
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.080
Short Term Fuel Trim Bank 1-Sensor 1(%)-5.5
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.845
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.105
Short Term Fuel Trim Bank 2-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.875
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII
Numbers of DTCs 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated Load Value(%)23.9
Engine Coolant Temperature(¡£C)96
Short Term Fuel Trim -Bank 1(%)-6.3
Long Term Fuel Trim - Bank 1(%)-14.8
Short Term Fuel Trim -Bank 2(%)-6.3
Long Term Fuel Trim - Bank 2(%)23.4
Engine RPM(rpm) 646
Vehicle Speed Sensor(km/h)4
Ignition Timing Advanece for #1 Cylinder(¡£)17.5
Intake Air Temperature(¡£C)21
Air Flow Rate from Mass Air Flow Sensor(g/s)6.14
Absolute Throttle Position(%)20.0
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.045
Short Term Fuel Trim Bank 1-Sensor 1(%)-3.1
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.840
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.120
Short Term Fuel Trim Bank 2-Sensor 1(%)2.3
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.870
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII
Numbers of DTCs 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated Load Value(%)24.3
Engine Coolant Temperature(¡£C)96
Short Term Fuel Trim -Bank 1(%)-0.8
Long Term Fuel Trim - Bank 1(%)-15.6
Short Term Fuel Trim -Bank 2(%)-3.1
Long Term Fuel Trim - Bank 2(%)22.7
Engine RPM(rpm) 738
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)12.0
Intake Air Temperature(¡£C)21
Air Flow Rate from Mass Air Flow Sensor(g/s)6.47
Absolute Throttle Position(%)20.0
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.055
Short Term Fuel Trim Bank 1-Sensor 1(%)2.3
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.830
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.060
Short Term Fuel Trim Bank 2-Sensor 1(%)4.7
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.860
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII
Numbers of DTCs 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated Load Value(%)21.6
Engine Coolant Temperature(¡£C)97
Short Term Fuel Trim -Bank 1(%)1.6
Long Term Fuel Trim - Bank 1(%)-13.3
Short Term Fuel Trim -Bank 2(%)3.1
Long Term Fuel Trim - Bank 2(%)26.6
Engine RPM(rpm) 755
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)12.0
Intake Air Temperature(¡£C)21
Air Flow Rate from Mass Air Flow Sensor(g/s)5.75
Absolute Throttle Position(%)20.0
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.720
Short Term Fuel Trim Bank 1-Sensor 1(%)-1.6
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.830
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.625
Short Term Fuel Trim Bank 2-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.855
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII
Numbers of DTCs 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated Load Value(%)22.7
Engine Coolant Temperature(¡£C)97
Short Term Fuel Trim -Bank 1(%)0.8
Long Term Fuel Trim - Bank 1(%)-13.3
Short Term Fuel Trim -Bank 2(%)-2.3
Long Term Fuel Trim - Bank 2(%)26.6
Engine RPM(rpm) 729
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)14.5
Intake Air Temperature(¡£C)22
Air Flow Rate from Mass Air Flow Sensor(g/s)5.98
Absolute Throttle Position(%)20.0
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.745
Short Term Fuel Trim Bank 1-Sensor 1(%)-3.9
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.825
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.655
Short Term Fuel Trim Bank 2-Sensor 1(%)-1.6
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.850
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII
Numbers of DTCs 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated Load Value(%)22.4
Engine Coolant Temperature(¡£C)97
Short Term Fuel Trim -Bank 1(%)-1.6
Long Term Fuel Trim - Bank 1(%)-16.4
Short Term Fuel Trim -Bank 2(%)-0.8
Long Term Fuel Trim - Bank 2(%)26.6
Engine RPM(rpm) 678
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)14.5
Intake Air Temperature(¡£C)22
Air Flow Rate from Mass Air Flow Sensor(g/s)5.92
Absolute Throttle Position(%)20.0
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.535
Short Term Fuel Trim Bank 1-Sensor 1(%)-1.6
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.820
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.625
Short Term Fuel Trim Bank 2-Sensor 1(%)-0.8
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.845
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII
Numbers of DTCs 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated Load Value(%)22.0
Engine Coolant Temperature(¡£C)97
Short Term Fuel Trim -Bank 1(%)-5.5
Long Term Fuel Trim - Bank 1(%)-17.2
Short Term Fuel Trim -Bank 2(%)-4.7
Long Term Fuel Trim - Bank 2(%)26.6
Engine RPM(rpm) 696
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)17.5
Intake Air Temperature(¡£C)22
Air Flow Rate from Mass Air Flow Sensor(g/s)5.86
Absolute Throttle Position(%)20.0
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.055
Short Term Fuel Trim Bank 1-Sensor 1(%)0.8
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.815
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.080
Short Term Fuel Trim Bank 2-Sensor 1(%)1.6
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.845
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII
No, but got my hands on a stethoscope, and think i found the problem. Air leak back side of throttle body. When i ran a smoke test , had smoke coming from that area, replaced pvc elbow and iac and still had smoke coming out. Ran the scope along the seam of throttle body and intake, and could hear what sounds like air.Replacing gasket today.
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