sanjoseweb Posted May 13, 2014 Share Posted May 13, 2014 I have a stock 05 Legacy GT with high AF learning values. CAL ID:A2WC500C Description: 05 USDM Legacy GT AT ECU ID:2F12505106 IAM 1.0000 A/F Learning #1: 0 - <5.60 5.60 - <10.00 10.00 - <40.00 40.00+ 7.70 10.80 10.30 11.40 FLKC Table 0 - <0.85 0.85 - <1.10 1.10 - <1.35 1.35 - <1.60 1.60+ 0 - <1650 0.00 0.00 0.00 0.00 0.00 1650 - <2600 0.00 0.00 -1.05 0.00 0.00 2600 - <3200 0.00 -0.35 -1.40 0.00 0.00 3200 - <4000 0.00 0.00 0.00 0.00 0.00 4000 - <4800 0.00 -2.80 0.00 0.00 0.00 4800 - <5800 0.00 0.00 0.00 0.00 0.00 5800+ 0.00 0.00 0.00 0.00 0.00 Any ideas what would cause this? Thanks for any help you can provide. Link to comment Share on other sites More sharing options...
RallyMachine Posted May 13, 2014 Share Posted May 13, 2014 Pre turbo vacuum leak? Check your turbo inlet where it connects to the turbo. Link to comment Share on other sites More sharing options...
sanjoseweb Posted May 13, 2014 Author Share Posted May 13, 2014 I thought a vacuum leak would mostly affect range A. My learning values increase in B, C and D. I tried checking for pre turbo leaks using water, but nothing yet. Link to comment Share on other sites More sharing options...
RallyMachine Posted May 13, 2014 Share Posted May 13, 2014 Based on my understanding (someone correct me if I'm wrong) since everything before the turbo is always under vacuum, even in boost, you will be running lean everywhere because unmetered air is being sucked into the intake tract after the maf sensor. If it were post turbo, C and D and maybe B would be negative because once the intercooler, TB, IM are pressurized under boost you would be loosing that air that was metered by the maf causing the car to run rich. Hopefully that makes sense, but I would start by checking the inlet connection right where it connects to the turbo and all hoses that connect to the inlet. Link to comment Share on other sites More sharing options...
sanjoseweb Posted May 14, 2014 Author Share Posted May 14, 2014 Based on my understanding (someone correct me if I'm wrong) since everything before the turbo is always under vacuum, even in boost, you will be running lean everywhere because unmetered air is being sucked into the intake tract after the maf sensor. If it were post turbo, C and D and maybe B would be negative because once the intercooler, TB, IM are pressurized under boost you would be loosing that air that was metered by the maf causing the car to run rich. Hopefully that makes sense, but I would start by checking the inlet connection right where it connects to the turbo and all hoses that connect to the inlet. I would expect the learning value to decrease with flow rate. Instead it goes up. If this was a vacuum leak that would mean a higher percentage of the intake flow would be from the leak as the flow rate goes up. That doesn't make sense to me. I was hoping that high learning values across the flow ranges would be a signature for an issue someone has seen before. Link to comment Share on other sites More sharing options...
RallyMachine Posted May 14, 2014 Share Posted May 14, 2014 I mean doesn't that make sense?? The harder the turbo sucks on the inlet the more air that is taken in post maf? Other than that all I can think of is bad maf or o2 sensor. Link to comment Share on other sites More sharing options...
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