Is my truck running lean?

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Old Jul 23, 2007 | 06:42 PM
  #1  
Turd Furguson's Avatar
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Arrow Is my truck running lean?

I have an Actron AutoScanner Plus which pulls live data while the truck is on. I am copy/pasting the info here in hopes that someone can tell me if I am running lean or not.

================================================== =
Recorded Data

MIL STATUS OFF
ABSLT TPS % 12.1
ENG SPEED RPM 599
BARO PRS KPA 97
CALC LOAD % 24.3
MAF FLOW GR/SE 4.52
OUT TEMP F 80
COOLANT F 190
IAT F 113
IGN ADVANCE DE 16.5
ST FTRM1 % 0.7
LT FTRM1 % -3.4
ST FTRM2 % 0.7
LT FTRM2 % -3.4
VEH SPEED MPH 0
ABSLT LOAD % 14.0
REL FRP KPA 2.70
FUEL SYS 1 CLSD
FUEL SYS 2 N/A
REL TPS % 1.1
THROT CMD % 1.5
ABS TPS B % 13.7
ACC POS D % 20.0
ACC POS E % 30.9
ACC POS F % 18.8
CAT TEMP11 F 793
CAT TEMP21 F 793
EVAP PURGE % 36.8
EVAP VP H2O 51.658
CMD EQ RATIO 0.999
O2S11 V 0.575
ST FTRM11 % -2.2
O2S12 V 0.685
O2S21 V 0.555
ST FTRM21 % -2.2
O2S22 V 0.645
CLR DIST($00) ---
CLR TRPS 65280
MIL DIST mi 0
FUEL LEVEL % 29.4
VPWR V 14.246
ENG RUN m:s 08:20
OBD2 STAT CA

Frame -5 Time -19.4


MIL STATUS OFF
ABSLT TPS % 12.1
ENG SPEED RPM 607
BARO PRS KPA 97
CALC LOAD % 23.9
MAF FLOW GR/SE 4.56
OUT TEMP F 80
COOLANT F 190
IAT F 113
IGN ADVANCE DE 17.0
ST FTRM1 % -1.0
LT FTRM1 % -3.4
ST FTRM2 % -1.0
LT FTRM2 % -3.4
VEH SPEED MPH 0
ABSLT LOAD % 14.0
REL FRP KPA 2.70
FUEL SYS 1 CLSD
FUEL SYS 2 N/A
REL TPS % 5.0
THROT CMD % 9.8
ABS TPS B % 21.1
ACC POS D % 23.1
ACC POS E % 31.7
ACC POS F % 18.8
CAT TEMP11 F 792
CAT TEMP21 F 792
EVAP PURGE % 36.8
EVAP VP H2O 42.919
CMD EQ RATIO 0.999
O2S11 V 0.800
ST FTRM11 % -3.4
O2S12 V 0.780
O2S21 V 0.415
ST FTRM21 % -3.4
O2S22 V 0.760
CLR DIST($00) ---
CLR TRPS 65280
MIL DIST mi 0
FUEL LEVEL % 30.1
VPWR V 14.296
ENG RUN m:s 08:24
OBD2 STAT CA

Frame -4 Time -15.5


MIL STATUS OFF
ABSLT TPS % 14.5
ENG SPEED RPM 2552
BARO PRS KPA 97
CALC LOAD % 16.4
MAF FLOW GR/SE 11.44
OUT TEMP F 80
COOLANT F 190
IAT F 113
IGN ADVANCE DE 25.0
ST FTRM1 % 0.0
LT FTRM1 % -2.2
ST FTRM2 % 0.8
LT FTRM2 % 2.3
VEH SPEED MPH 0
ABSLT LOAD % 28.0
REL FRP KPA 2.58
FUEL SYS 1 CLSD
FUEL SYS 2 N/A
REL TPS % 0.7
THROT CMD % 4.7
ABS TPS B % 18.4
ACC POS D % 19.2
ACC POS E % 30.5
ACC POS F % 18.8
CAT TEMP11 F 813
CAT TEMP21 F 814
EVAP PURGE % 0.0
EVAP VP H2O 8.738
CMD EQ RATIO 0.999
O2S11 V 0.045
ST FTRM11 % 1.5
O2S12 V 0.725
O2S21 V 0.770
ST FTRM21 % -4.9
O2S22 V 0.705
CLR DIST($00) ---
CLR TRPS 65280
MIL DIST mi 0
FUEL LEVEL % 29.4
VPWR V 14.271
ENG RUN m:s 08:27
OBD2 STAT CA

Frame -3 Time -11.6


MIL STATUS OFF
ABSLT TPS % 12.9
ENG SPEED RPM 949
BARO PRS KPA 97
CALC LOAD % 20.7
MAF FLOW GR/SE 6.36
OUT TEMP F 80
COOLANT F 190
IAT F 111
IGN ADVANCE DE 37.0
ST FTRM1 % 0.0
LT FTRM1 % -3.4
ST FTRM2 % -1.0
LT FTRM2 % -2.2
VEH SPEED MPH 0
ABSLT LOAD % 13.0
REL FRP KPA 2.71
FUEL SYS 1 CLSD
FUEL SYS 2 N/A
REL TPS % 0.7
THROT CMD % 1.5
ABS TPS B % 13.7
ACC POS D % 20.3
ACC POS E % 31.7
ACC POS F % 20.0
CAT TEMP11 F 833
CAT TEMP21 F 833
EVAP PURGE % 0.3
EVAP VP H2O 26.473
CMD EQ RATIO 0.999
O2S11 V 0.065
ST FTRM11 % 0.7
O2S12 V 0.700
O2S21 V 0.060
ST FTRM21 % 0.7
O2S22 V 0.695
CLR DIST($00) ---
CLR TRPS 65280
MIL DIST mi 0
FUEL LEVEL % 29.4
VPWR V 14.271
ENG RUN m:s 08:31
OBD2 STAT CA

Frame -2 Time -7.8
 
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Old Jul 23, 2007 | 06:45 PM
  #2  
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From: Kentucky
MIL STATUS OFF
ABSLT TPS % 13.7
ENG SPEED RPM 702
BARO PRS KPA 97
CALC LOAD % 34.9
MAF FLOW GR/SE 11.44
OUT TEMP F 80
COOLANT F 190
IAT F 111
IGN ADVANCE DE 32.0
ST FTRM1 % 0.0
LT FTRM1 % -3.4
ST FTRM2 % -1.0
LT FTRM2 % -3.4
VEH SPEED MPH 0
ABSLT LOAD % 8.0
REL FRP KPA 2.64
FUEL SYS 1 CLSD
FUEL SYS 2 N/A
REL TPS % 2.3
THROT CMD % 3.1
ABS TPS B % 13.7
ACC POS D % 19.2
ACC POS E % 30.5
ACC POS F % 18.8
CAT TEMP11 F 843
CAT TEMP21 F 844
EVAP PURGE % 0.0
EVAP VP H2O 26.473
CMD EQ RATIO 0.999
O2S11 V 0.045
ST FTRM11 % 0.8
O2S12 V 0.710
O2S21 V 0.605
ST FTRM21 % -4.6
O2S22 V 0.710
CLR DIST($00) ---
CLR TRPS 65280
MIL DIST mi 0
FUEL LEVEL % 29.4
VPWR V 14.296
ENG RUN m:s 08:35
OBD2 STAT CA

Frame -1 Time -3.9


MIL STATUS OFF
ABSLT TPS % 11.7
ENG SPEED RPM 1167
BARO PRS KPA 97
CALC LOAD % 16.0
MAF FLOW GR/SE 5.36
OUT TEMP F 80
COOLANT F 190
IAT F 113
IGN ADVANCE DE 31.0
ST FTRM1 % -4.6
LT FTRM1 % -3.4
ST FTRM2 % -4.6
LT FTRM2 % -3.4
VEH SPEED MPH 0
ABSLT LOAD % 12.0
REL FRP KPA 2.68
FUEL SYS 1 CLSD
FUEL SYS 2 N/A
REL TPS % 2.3
THROT CMD % 2.7
ABS TPS B % 14.5
ACC POS D % 20.7
ACC POS E % 32.5
ACC POS F % 21.5
CAT TEMP11 F 852
CAT TEMP21 F 852
EVAP PURGE % 0.0
EVAP VP H2O 26.473
CMD EQ RATIO 0.999
O2S11 V 0.050
ST FTRM11 % 0.8
O2S12 V 0.710
O2S21 V 0.060
ST FTRM21 % -1.0
O2S22 V 0.690
CLR DIST($00) ---
CLR TRPS 65280
MIL DIST mi 0
FUEL LEVEL % 29.8
VPWR V 14.271
ENG RUN m:s 08:39
OBD2 STAT CA

Frame 0 Time 0.0
 
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Old Jul 23, 2007 | 06:46 PM
  #3  
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From: Kentucky
MIL STATUS OFF
ABSLT TPS % 20.7
ENG SPEED RPM 1981
BARO PRS KPA 97
CALC LOAD % 63.1
MAF FLOW GR/SE 37.79
OUT TEMP F 80
COOLANT F 190
IAT F 111
IGN ADVANCE DE 41.5
ST FTRM1 % 0.7
LT FTRM1 % 0.8
ST FTRM2 % 0.7
LT FTRM2 % 0.7
VEH SPEED MPH 0
ABSLT LOAD % 10.0
REL FRP KPA 2.68
FUEL SYS 1 CLSD
FUEL SYS 2 N/A
REL TPS % 4.7
THROT CMD % 9.4
ABS TPS B % 33.3
ACC POS D % 30.9
ACC POS E % 39.6
ACC POS F % 26.6
CAT TEMP11 F 893
CAT TEMP21 F 895
EVAP PURGE % 8.2
EVAP VP H2O 26.473
CMD EQ RATIO 0.999
O2S11 V 0.020
ST FTRM11 % 3.1
O2S12 V 0.675
O2S21 V 0.035
ST FTRM21 % 3.1
O2S22 V 0.670
CLR DIST($00) ---
CLR TRPS 65280
MIL DIST mi 0
FUEL LEVEL % 29.8
VPWR V 14.271
ENG RUN m:s 08:43
OBD2 STAT CA

Frame 1 Time 4.1


MIL STATUS OFF
ABSLT TPS % 23.5
ENG SPEED RPM 3207
BARO PRS KPA 97
CALC LOAD % 54.1
MAF FLOW GR/SE 31.45
OUT TEMP F 80
COOLANT F 190
IAT F 111
IGN ADVANCE DE 44.5
ST FTRM1 % 7.8
LT FTRM1 % 0.7
ST FTRM2 % 6.2
LT FTRM2 % 4.6
VEH SPEED MPH 0
ABSLT LOAD % 33.0
REL FRP KPA 3.31
FUEL SYS 1 CLSD
FUEL SYS 2 N/A
REL TPS % 7.8
THROT CMD % 10.1
ABS TPS B % 24.3
ACC POS D % 19.2
ACC POS E % 30.1
ACC POS F % 18.0
CAT TEMP11 F 1007
CAT TEMP21 F 1007
EVAP PURGE % 0.0
EVAP VP H2O 26.473
CMD EQ RATIO 0.999
O2S11 V 0.065
ST FTRM11 % 6.2
O2S12 V 0.685
O2S21 V 0.725
ST FTRM21 % 0.7
O2S22 V 0.790
CLR DIST($00) ---
CLR TRPS 65280
MIL DIST mi 0
FUEL LEVEL % 29.4
VPWR V 14.144
ENG RUN m:s 08:47
OBD2 STAT CA

Frame 2 Time 7.9


MIL STATUS OFF
ABSLT TPS % 13.3
ENG SPEED RPM 1555
BARO PRS KPA 97
CALC LOAD % 35.2
MAF FLOW GR/SE 24.76
OUT TEMP F 80
COOLANT F 190
IAT F 111
IGN ADVANCE DE 37.0
ST FTRM1 % -1.0
LT FTRM1 % -3.4
ST FTRM2 % -4.6
LT FTRM2 % -2.2
VEH SPEED MPH 0
ABSLT LOAD % 8.0
REL FRP KPA 2.65
FUEL SYS 1 CLSD
FUEL SYS 2 N/A
REL TPS % 2.3
THROT CMD % 3.1
ABS TPS B % 16.0
ACC POS D % 19.2
ACC POS E % 30.1
ACC POS F % 18.4
CAT TEMP11 F 1052
CAT TEMP21 F 1053
EVAP PURGE % 0.0
EVAP VP H2O 35.212
CMD EQ RATIO 0.999
O2S11 V 0.045
ST FTRM11 % -4.6
O2S12 V 0.855
O2S21 V 0.045
ST FTRM21 % -4.9
O2S22 V 0.820
CLR DIST($00) ---
CLR TRPS 65280
MIL DIST mi 0
FUEL LEVEL % 29.4
VPWR V 14.296
ENG RUN m:s 08:51
OBD2 STAT CA

Frame 3 Time 11.8
 
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Old Jul 24, 2007 | 05:18 PM
  #4  
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Nobody know anything ????
 
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Old Jul 24, 2007 | 05:45 PM
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Not a damn thing!!!That chit is beyond me

Fax that stuff to someone who tunes these trucks.
You might have better luck in the programmer section and maybe Mike Troyer will see it
 

Last edited by Kevin24; Jul 24, 2007 at 05:48 PM.
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Old Jul 24, 2007 | 07:49 PM
  #6  
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This is what happens with a tool you know nothing about and it does you little good..
Go to your local tech school and learn about all the readouts, what they mean and how to interpet them.
The techs have to do it!
First place for you to start, is print out the full OBDII overview from the Motorcraft website and dig in all 100 + pages.
It's a nice scanner but you need the background to make it useful beyond reading fault codes.
Good luck. I don't mean this as a critisism of your intent to get around knowledge but only of the reality of it.
 
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Old Jul 24, 2007 | 08:26 PM
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+ 1 It will benefit you more learning yourself .

Look at the first two (4 & 5) Somethings wrong there.

Mann , No tranny temps?
 
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Old Jul 24, 2007 | 08:42 PM
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From: Georgia on my mind...
ST FTRM1 % 0.7
LT FTRM1 % -3.4
ST FTRM2 % 0.7
LT FTRM2 % -3.4
All your fuel trims look kinda like this, give or take a couple percent either way. I don't see anything out of the ordinary at first glance.

ENG SPEED RPM 2552
BARO PRS KPA 97
CALC LOAD % 16.4
MAF FLOW GR/SE 11.44
OUT TEMP F 80
COOLANT F 190
IAT F 113
IGN ADVANCE DE 25.0
ST FTRM1 % 0.0
LT FTRM1 % -2.2
ST FTRM2 % 0.8
LT FTRM2 % 2.3
This recording, you came off idle. If you have a lean condition, your long term fuel trims will be way positive. How far positive depends on the severity of whatever's causing the lean condition (for instance, a leaking PCV tube will typically make long terms go 20%+). In the presence of a big vacuum leak, coming off idle will make fuel trims go negative since engine vacuum goes down as engine speed goes up. In general coming off idle will make fuel trims go negative. Bank 2 is still reading +2.3%, but I bet not long after you took that snap shot it probably went to around 0% or -2%, somewhere around there.

Your recordings look okay to me. In general, your short term fuel trims should be switching in accordance with the upstream O2s - that's the short term's sole purpose in life, to make the O2s switch. They should be hovering around 3-5% either way. Long term fuel trim, very broadly speaking the closer they remain to zero, the better. 5-7% either way is okay, any more than 10% correction either way and there's a potential problem that needs to be fixed, IMO. Any more than 17-18% either way and you're gonna get a check engine light.
 
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Old Jul 24, 2007 | 08:47 PM
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The idles off in frame 4 and 5 - should be @750. The data starts at idle.
 
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Old Jul 24, 2007 | 08:50 PM
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From: Georgia on my mind...
Originally Posted by jbrew
The idles off in frame 4 and 5 - should be @750. The data starts at idle.
Nah, 3Vs idle kinda low. That's partly why so many people bitch that they run rough. There's PCM calibrations that'll bring them up to 650-700ish, but there's nothing really wrong with one at 600.
 
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Old Jul 24, 2007 | 08:53 PM
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Okay , thanx Quintin.
 
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Old Jul 24, 2007 | 09:40 PM
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From: Kentucky
Unfortunately I don't have time to go to tech school. Nor do I have the desire to.

I bought a Haynes repair book and it doesn't tell you a damn thing as to the scale range that your O2 sensors should be operating at. All I had to pull some information on them was with my scanner.

Thank you Quintin for explaining on what I should be looking for. This will help me figure out an issue I am having with some vibrations and what to look for in the engine.

I appreciate the input guys/gals.
 
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Old Jul 24, 2007 | 10:15 PM
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From: Georgia on my mind...
Originally Posted by Turd Furguson
Unfortunately I don't have time to go to tech school. Nor do I have the desire to.

I bought a Haynes repair book and it doesn't tell you a damn thing as to the scale range that your O2 sensors should be operating at. All I had to pull some information on them was with my scanner.

Thank you Quintin for explaining on what I should be looking for. This will help me figure out an issue I am having with some vibrations and what to look for in the engine.

I appreciate the input guys/gals.
Well, these engines typically do run very lean at idle. It's not lean enough to fall out of factory parameters, but compared to the previous generation F150's engine tuning they are pretty lean. That's also why a lot of cold air intakes may turn the check engine light on without a programmer to compensate.

This overly lean idle tuning also causes a slightly rough idle, combined with a relatively low idle speed. It doesn't cause any harm, but it's annoying as hell.
 
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Old Jul 24, 2007 | 10:17 PM
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Originally Posted by Quintin
Well, these engines typically do run very lean at idle. It's not lean enough to fall out of factory parameters, but compared to the previous generation F150's engine tuning they are pretty lean. That's also why a lot of cold air intakes may turn the check engine light on without a programmer to compensate.

This overly lean idle tuning also causes a slightly rough idle, combined with a relatively low idle speed. It doesn't cause any harm, but it's annoying as hell.
I am going to be adding a CAI and some new exhaust at some point, but this is some good information for me to know. This ensures me I am probably going to be okay depending which kit I buy.
 
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Old Jul 24, 2007 | 10:43 PM
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Originally Posted by Turd Furguson
I am going to be adding a CAI ... This ensures me I am probably going to be okay depending which kit I buy.
Not necessarily.

There's a whole 'nother operating regime you haven't explored yet - Open Loop.

All your recordings were taken at light load - Closed Loop, where the O2 feedback is used to regulate A/F's around Stioic (14.7:1).

When you get into the throttle - say above 70% Load to WOT, the PCM (hopefully - some don't), switches to Open Loop operation - the O2 signals are ignored and the fueling is set via tables stored in the PCM, and varies according to the MAF transfer function, as well as being influenced by other sensor data ( e.g IAT's , etc).

This is the other area where aftermarket CAI's can get you into trouble - they usually pecker the MAF TF due to poor design and/or spotty R&D - and hence can cause lean conditions - sometimes with NO CEL set. The only solution is proper custom tuning, where the MAF TF is re-written to take the deviations into account.

If my explanation and/or abbreviations confuse you, some time spent using search function in the Chips forum will rectify it.

Great tool - now you need to back that up with some baseline knowledge to leverage it effectively.

Good luck.
 
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