Check engine light came on two weeks ago. Finally got in last Friday. Nothing felt wrong when I was driving it, but there was a high pitched windy whirring noise when I would be at speed and let off the gas. Press the fuel and the noise went away, ease off, it came back. Onstar reported back Emissions Issue.
The dealer gave it back same day and they reprogrammed the ECM. The check engine is light off, the whirring noise is gone, and my hard shifts have improved tremendously. Does that make sense?
After the reprogram, the next two times I backed out of my driveway and shifted into drive my RPM shot up quick and dropped back down, as if it downshifted too soon, but how would it downshift, I just put it in drive from reverse. After that, it would drive fine. So I was like frick, this isn't good.
But it never happened again, and now my shifting is waaaay smoother. My bone jarring 1 - 2 is much smoother and quite often seamless. Every shift after 2nd is super smooth. So much so that I really notice the difference.
Another odd thing, when I set my Drive Mode to Sport, and I turn off my car it stays on Sport on next start up. This didn't happen before, it would always revert to Touring. I much prefer it staying where I set it like it does now, but I didn't think that it works that way.
Any of these things make sense? They seem pretty random. No?
The dealer gave it back same day and they reprogrammed the ECM. The check engine is light off, the whirring noise is gone, and my hard shifts have improved tremendously. Does that make sense?
After the reprogram, the next two times I backed out of my driveway and shifted into drive my RPM shot up quick and dropped back down, as if it downshifted too soon, but how would it downshift, I just put it in drive from reverse. After that, it would drive fine. So I was like frick, this isn't good.
But it never happened again, and now my shifting is waaaay smoother. My bone jarring 1 - 2 is much smoother and quite often seamless. Every shift after 2nd is super smooth. So much so that I really notice the difference.
Another odd thing, when I set my Drive Mode to Sport, and I turn off my car it stays on Sport on next start up. This didn't happen before, it would always revert to Touring. I much prefer it staying where I set it like it does now, but I didn't think that it works that way.
Any of these things make sense? They seem pretty random. No?
