99 f150 xl 4.2 auto.

I drive 26mil one way to work mostly interstate. on the way to work truck runs great. On the way home when temps are above 90deg. it will stumble once in awhile when accelerating from 60. No DTC at this time. I have cleaned the mass flow sensor . and new air filter. plugs and wires motorcraft less than a year old. This is live data. I separated the line in qustion

Number of DTCs stored in this ECU 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated LOAD Value(%)22.7
Engine Coolant Temperature(¡£C)99
Short Term Fuel Trim -Bank 1(%)-12.5
Long Term Fuel Trim - Bank 1(%)6.3
Short Term Fuel Trim -Bank 2(%)11.7
Long Term Fuel Trim - Bank 2(%)3.1
Engine RPM(rpm) 808
Vehicle Speed Sensor(km/h)0
Ignition Timing Advanece for #1 Cylinder(¡£)17.5
Intake Air Temperature(¡£C)41
Air Flow Rate from Mass Air Flow(g/s)4.96
Absolute Throttle Position(%)19.6
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.540
Short Term Fuel Trim Bank 1-Sensor 1(%)-10.2
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.755

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(%)3.9
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.545
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII

 

I hate fuel ratios. LOL. But to me it looks like the sensor on bank 1 isn't reading right or has wiring issues. In live data you will have a very weird (depends on scanner type) line on Bank1 Sen2. All the others should read fairly fluid and similar, when you raise the throttle and let it recover. Nothing like B1S2 would read.

 

I've never been confident about this but I think "NA" on the short term fuel trim bank 1 just means the PCM isn't adding or subtracting fuel based the O2 sensor reading. That's a good thing since any change from the learned mapped fuel trim doesn't exist. .

IIRC anything over a +\- 10% is when trim begins to enter the fault code range and your bank 2 sensor is showing 99.2% but no fault code. You also show a 11.7% and a -12.5% which is a little high but nothing like the 99.2%. That's very rich. IIRC 99.2% means the PCM is adding 99.2% of the learned mapped normal fuel trim. The -12.5% means the fuel is lean at that percentage from the learned mapped normal fuel trim. (I hope I have all of this right for you.) Looking at the O2 sensor voltages though they are all fairly consistent.

Then again your in closed loop mode which is one of the things about reading status like this that I get confused with. I don't do any tuning so I don't keep up on using this info.

About your data though, with 808 RPM's and 0 km/h this data doesn't represent the 60 mph where you say you are having a problem.

An explanation from anyone about CL and OL and about when 1 or the other, or both of the O2 sensors on the banks is being used would be appreciated.

 

"N/A" means "Not Applicable". There is no "fuel trim" for the downstream (#2) sensors. Ignore the scan tool's reading for this line and for the second to the last line. It's an issue with what the scan tool is displaying, not with the truck itself.

The one thing thing does stand out in that idle speed live data dump is the disparity between the fuel trims between banks. One is well positive and one is well negative although neither is near the fault zone. The 4.2L V6 isn't my cup of tea so I've never dug into it before. Perhaps someone more familiar with that engine might have experience or insight as to whether or not that's an indicator of an issue.

What would be useful would be to monitor the live Mode $06 data on the drive home to see if you're registering mild misfires and, if so, if they are restricted to a single cylinder. Just because the plugs and wires are only a year old does not mean that they are good.

 

A quick look at this from someone else said at idle the throttle position should be 0% or close to it. WOT should read between 25-100%. 19.6% at idle isn't right. Advice, check your throttle position sensor.

 

Seems like AK looked this up in his manuals for someone before.... and if my memory serves correctly, Ford states that idle it should be around 17 to 19% on these.

@akdoggie

 

This is when it started to cut out today. going to get my ELM back from my son and run torque pro. to get more data.

Number of DTCs stored in this ECU 0
Fuel system 1 statusCL
Fuel System 2 status--
Calculated LOAD Value(%)93.7
Engine Coolant Temperature(¡£C)97
Short Term Fuel Trim -Bank 1(%)32.8
Long Term Fuel Trim - Bank 1(%)9.4
Short Term Fuel Trim -Bank 2(%)32.8
Long Term Fuel Trim - Bank 2(%)2.3
Engine RPM(rpm) 1448
Vehicle Speed Sensor(km/h)53
Ignition Timing Advanece for #1 Cylinder(¡£)7.0
Intake Air Temperature(¡£C)36
Air Flow Rate from Mass Air Flow(g/s)8.55
Absolute Throttle Position(%)19.6
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.000
Short Term Fuel Trim Bank 1-Sensor 1(%)32.8
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.010
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.000
Short Term Fuel Trim Bank 2-Sensor 1(%)32.8
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.010
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBDII

 

Fair nuff but don't you question that there's the same throttle position percentage when going 0 or 53? I'm also not sure of how the differences between absolute throttle position and relative or learned throttle position percentages are figured. I wouldn't mind knowing that for the trivia value of just knowing it.

 

It depends.... if he was coasting, that would make sense to me because the TPS is at home. If he was accelerating, then yes - I would say he has an issue.

 

A 19.6% throttle position at idle speed expressed as a percentage is fine. The PCED doesn't use percentage to give reference values for that one. At hot idle, the allowable TPS voltage range is 0.53-1.27 volts DC. That's the voltage divider output from a nominal 5 volt reference supply which, of course, has its own tolerance (which also isn't given, I'd assume a 1/4 volt would be okay). You can do some simple division to come up with a range to expected TPS percentages. In the long run, though, it doesn't matter what the EXACT voltage is as long as the voltage is within the allowable range. The PCM measures the TPS voltage at every startup and then performs the necessary scaling to normalize the internal value.

Now, your new 53 km/hr data is truly whacked out, assuming your scan tool (whatever it might be) is doing the math right. You're showing the same absolute throttle position as you did at idle speed, your calculated load percentage is impossibly high, and all of your oxygen sensors are reading essentially a flat line causing your fuel trims to be near the maximum possible positive values. The thing is probably running pig-rich. That is an illogical set of values.