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Hey everyone,
I'm the proud new owner of a 2009 A6 3.0T sedan with 106,000 miles, upgrading from my 2000 A4 2.8 with 215,000 miles. Mostly in love with the car, but have noticed that sometimes when accelerating the RPMs will fluctuate a bit and the car feels like it's kind of being held back in a way. Haven't really noticed any fluctuations while cruising. Performed a TBA and ECM Kick-Down reset, which helped with throttle delay some, but still had the above symptoms.
Based on research, a lot about torque converters came up so I thought I'd investigate. So, on my home from work I logged the TC using VAGCOM for about 20 minutes. Below are a view snippets of data (note the vehicle speed times differ slightly from the rest of the date). As you can see, the TC slip is not always 0rpm when closed, and not always between 20 and 120 rpms when in control mode (these limiting values have popped up for some other Audi models, correct me if they're not applicable to the C6). The column with the G000 header tests to see if slip is 0 rpm when TC is closed, the column with F0 header tests to see if slip is between 20 and 120 rpms when in control mode ("Bad" means it fails the criteria, blank means it passes, and dashes means TC mode is different than the mode being checked in that column).
Even though the slip is 0 rpm the majority of the time the TC is closed, and between 20 and 120 rpms the majority of the time when in control mode, could these values indicated my TC is on its way out? Any thoughts would be greatly appreciated!
I love data!
don't have a conclusive answer, but what occurs to me is that when TC closed, you seem to get slip when hitting the throttle. that is intuitive. don't know what the sampling rate is for TC status, vs. slip rpm, i think it is at least possible that the TC comes out of lock when you hit the throttle, but perhaps the status doesn't change on the TC status. persistency (how many frames of status change are necessary for the parameter to update in the telemetry) may also come into play.
oh, and the TC going from closed to reg mode at 0 throttle during coast down is likely due to tiptronic shifting down. empirically (Not vagcom), i notice this when coasting down.
maybe i'll get to logging some data. what function/measuring blocks are those?
Have you changed the transmission fluid? Did you reset the transmission adaptations after that? It basically recalibrates all the clutches and presumably the TC. You use the VAG-COM and then you drive around in a specific speed/gear.
I love mine as well but the transmission just feels sloppy to me. I miss having a stick so bad. This would be the perfect car as far as I am concerned if I could just have a stick shift.
07-27-2016, 04:34 PM
torque converter going bad?
