Does anyone know the LTFT % trip point for a 17545 - system too rich (add) DTC?
03-01-2009, 07:48 AM
#16
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I did log it. It looks like this (see graph).
<center><img src="http://tlcpropmgmt.com/audi/LTFTs_vs_Time_022809_0.0_primary_fuel_6.0_secondar y.jpg"></center><p>I had these DTCs at the end of the graph.
Saturday,28,February,2009,12:07:02:16665
VAG-COM Version: Release 704.1
Address 01: Engine
Control Module Part Number: 8D0 907 551 M
Component and/or Version: K0463085-93 G04 CPT4
Software Coding: 06711
Work Shop Code: WSC 79415
2 Faults Found:
17545 - Fuel Trim: Bank 1 (Add): System too Rich
P1137 - 35-00 - -
17547 - Fuel Trim: Bank 2 (Add): System too Rich
P1139 - 35-10 - - - Intermittent
Readiness: 0000 0000
Bruce
Saturday,28,February,2009,12:07:02:16665
VAG-COM Version: Release 704.1
Address 01: Engine
Control Module Part Number: 8D0 907 551 M
Component and/or Version: K0463085-93 G04 CPT4
Software Coding: 06711
Work Shop Code: WSC 79415
2 Faults Found:
17545 - Fuel Trim: Bank 1 (Add): System too Rich
P1137 - 35-00 - -
17547 - Fuel Trim: Bank 2 (Add): System too Rich
P1139 - 35-10 - - - Intermittent
Readiness: 0000 0000
Bruce
03-01-2009, 07:55 AM
#18
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Mine is tripping at around -6% on ADD for some reason (see link)
It should not trip this low as you said. Is this limit something the tuner set?
Bruce<ul><li><a href="https://forums.audiworld.com/s4/msgs/2900090.phtml">LTFTs vs time from ECU reset.</a></li></ul>
Bruce<ul><li><a href="https://forums.audiworld.com/s4/msgs/2900090.phtml">LTFTs vs time from ECU reset.</a></li></ul>
03-01-2009, 08:01 AM
#19
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I'm just trying to get this weirdness figured out with my LTFTs. I am running lean on part throttle
and rich on Idle. I can get partial throttle to be less lean, but makes IDLE even more rich.
Bruce<ul><li><a href="http://tlcpropmgmt.com/audi/LTFTs_vs_Time_022809_0.0_primary_fuel_6.0_secondar y.jpg">Rich/Lean LTFTs from reset</a></li></ul>
Bruce<ul><li><a href="http://tlcpropmgmt.com/audi/LTFTs_vs_Time_022809_0.0_primary_fuel_6.0_secondar y.jpg">Rich/Lean LTFTs from reset</a></li></ul>
03-01-2009, 08:19 AM
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If it had all factory parts, I would start with checking the MAF. I have had the N80 do something
similar where it slightly sticks open and draws too much fuel vapor at idle but all your readiness is set with no EVAP faults.
You could also check the temp sensor and make sure coolant is fully warm. If it is giving a false signal as being too low it will be a little rich.
I would almost be more concerned about the part throttle too lean. I know it is throwing codes for idle, but it should give you lean codes too! Again the MAF may be at fault but with the different housing size, hard to say. If you can find someone to swap elements with, that would be where I would start.
And you may just try clamping off the N80 purge valve just for fun to see where the numbers go.
You could also check the temp sensor and make sure coolant is fully warm. If it is giving a false signal as being too low it will be a little rich.
I would almost be more concerned about the part throttle too lean. I know it is throwing codes for idle, but it should give you lean codes too! Again the MAF may be at fault but with the different housing size, hard to say. If you can find someone to swap elements with, that would be where I would start.
And you may just try clamping off the N80 purge valve just for fun to see where the numbers go.