Stalls at stop signs, no codes or any other symptoms.

[5000fingers]

I have a 2011 Outback (4 cyl engine), and it is stalling out at stop signs. It is not throwing any codes, or having any other symptoms. What might be going on, and what can I do to diagnose it? The local mechanic is pretty stumped too, saying that the only thing he might try is a new torque converter. But I don't want to just throw parts at the thing, especially when they are that expensive, and I don't understand the issue. I'd appreciate any insight you can give.

[Daskuppler]

54 minutes ago, 5000fingers said:

I have a 2011 Outback (4 cyl engine), and it is stalling out at stop signs. It is not throwing any codes, or having any other symptoms. What might be going on, and what can I do to diagnose it? The local mechanic is pretty stumped too, saying that the only thing he might try is a new torque converter. But I don't want to just throw parts at the thing, especially when they are that expensive, and I don't understand the issue. I'd appreciate any insight you can give.

Maybe a vacuum leak?  If you stop really slowly does it still do it?  Is it worse if you stop quickly?

[GeneralDisorder]

Torque converter thrust bearing failure not allowing TCC to unlock fast enough. You need the countermeasure torque converter with the updated needle bearing thrust washer.

There's a service bulletin about this out there somewhere. 

GD