urdrwho Posted July 14, 2018 Share Posted July 14, 2018 Idle never burps with no ac running. With the ac running, sitting at a traffic light, now and then there can be some engine burps. With 37,000 miles on the odo I can't imagine any issues with sensors or MAF, etc. It isn't a big issue but just not a perfect idle. I just had the ecm updated, there are no updated in waiting so it can't be an update issue. Sent from my SM-S320VL using Tapatalk Link to comment Share on other sites More sharing options...
Perscitus Posted July 14, 2018 Share Posted July 14, 2018 It actually can. Idle stability and throttle position sensor range must be re-learned after ECU update or reset. You can also adjust your idle RPM target and cold/warm/hot start RPM drop off profiles in the tune without changing anythig else if you desire. Read up on the ECU reset TPS and idle re-learn procedure. Its easy. And at 38K, give that MAF a good cleaning. Link to comment Share on other sites More sharing options...
chowser51 Posted July 14, 2018 Share Posted July 14, 2018 Don’t wait till 69k to clean your MAF sensor like I did. Link to comment Share on other sites More sharing options...
urdrwho Posted July 14, 2018 Author Share Posted July 14, 2018 It actually can. Idle stability and throttle position sensor range must be re-learned after ECU update or reset. You can also adjust your idle RPM target and cold/warm/hot start RPM drop off profiles in the tune without changing anythig else if you desire. Read up on the ECU reset TPS and idle re-learn procedure. Its easy. And at 38K, give that MAF a good cleaning.I guess it is time to pull out the can of MAF cleaner. Sent from my SM-S320VL using Tapatalk Link to comment Share on other sites More sharing options...
YeuEmMaiMai Posted July 17, 2018 Share Posted July 17, 2018 the AC is not the issue, it is literally on all the time. 2013+ legacies/outback use a clutch-less design that has a variable geometry (displacement) compressor. capacity varies anywhere from 2% to 100% and it is all computer controlled. If your car is not idling right, connect a data logger to it and see what the sensors are telling you. Link to comment Share on other sites More sharing options...
waldguy Posted July 17, 2018 Share Posted July 17, 2018 Whatever the design, my engine also vibrates slightly on idle when the air compressor is under load. You have to be paying attention to catch it. Link to comment Share on other sites More sharing options...
urdrwho Posted July 17, 2018 Author Share Posted July 17, 2018 Yep that is what I am feeling. Whatever the design, my engine also vibrates slightly on idle when the air compressor is under load. You have to be paying attention to catch it. Link to comment Share on other sites More sharing options...
urdrwho Posted July 17, 2018 Author Share Posted July 17, 2018 Could do that but it doesn't always do it but when it does do it, the AC is under load. For kicks and giggles I cleaned the MAF today. Why? Because it is easy and for a just in case scenario that it has a slight bit of dirt and isn't metering correctly at idle with the AC under load. the AC is not the issue, it is literally on all the time. 2013+ legacies/outback use a clutch-less design that has a variable geometry (displacement) compressor. capacity varies anywhere from 2% to 100% and it is all computer controlled. If your car is not idling right, connect a data logger to it and see what the sensors are telling you. Link to comment Share on other sites More sharing options...
YeuEmMaiMai Posted July 17, 2018 Share Posted July 17, 2018 if your MAF is not metering correctly, engine load is irrelevant as it is measuring airflow past the sensor. idle warm and no load should be 2.3 to 2.6 grams a second... if you are in the 4 to 5 range, replace your sensor. Link to comment Share on other sites More sharing options...
meaux Posted July 17, 2018 Share Posted July 17, 2018 My Idle w/Full Auto on, in park, will go to 900rpm after a minute or so... I can get it to drop 650 or so by taking it off 'Full Auto' by decreasing Fan Speed one notch... Normal? Link to comment Share on other sites More sharing options...
urdrwho Posted July 18, 2018 Author Share Posted July 18, 2018 I guess I need to hook up my meter and do some data recording. Ha! My wife never noticed but me....I get anal over such stuff. Aiming for perfection. QUOTE=YeuEmMaiMai;5814543]if your MAF is not metering correctly, engine load is irrelevant as it is measuring airflow past the sensor. idle warm and no load should be 2.3 to 2.6 grams a second... if you are in the 4 to 5 range, replace your sensor. Link to comment Share on other sites More sharing options...
YeuEmMaiMai Posted July 18, 2018 Share Posted July 18, 2018 MAF on any engine should be roughly displacement at idle Link to comment Share on other sites More sharing options...
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