I have had this issue with the car lose of power since day one. The dealer doesn't know what to do with it since they can't duplicate the issue. They will keep it for a week at a time. I have a case manager at Toyota involved but I'm certain it will get fixed.
FYI, when this happens if I...
Ok, I've been wondering about the valve and when it truly opens. I have my car programed to start in sport mode, but the valve does not open on cold start. Just wanted to verify that is does stay closed in sport mode until the car warms up a bit? It does eventually open.
I did use BimmerLink. So when I start the Supra cold, the valve is not open. It's pretty much always closed on cold start. It's about 50/50 on a warm start.
I also used BimmerCode and set the car to start in Sport Mode hoping that would help but it didn't.
Wanted to check back in. My Supra remains very tame. No pops or gurgles on overruns. The dealer doesn't see anything wrong. It's like sport mode doesn't do much. I mean it does change the shifting but sometimes I don't even hear the valve open.