My 2.0T has a tendency to tremble at idle. I've switched to premium gas with no results. Also it doesn't alway happen, very irregular. Any ideas?
I too had the trembling with my 3.6 CTS4 but not with my XTS unless I let it idle in park for more than a few minutes. I always just thought it was normal for GM cars. Hell, even out 2013 LaCrosse did it when idling in park.I used to have a CTS with the 3.6l and it did this also. Now I have the 2.5 ATS. From my past experience I am confident it has to do with engine oil. When the CTS was getting old on oil around 5K miles I lose some of the oil from the engine (probably going into the intake) I would have a feeling of shakes and misses. I would then change the oil at 5K miles and the engine smooths right back out again.
All please check your oil level as it may be you are running a little low and is causing all this trembling and shakes. I know on my ATS 2.5l other than the slight roughness at startup from the engine turning over I could not be more pleased. We just got it last week used with 18K miles and it's quite and very smooth even with the 18" Run flats.
I just called the dealer to try and get this fix scheduled, they told me to bring it in so they can validate the problem first because they can't just order parts based on something I found on the internet. Told them to look up the PIP # and then my history of over a dozen times complaining of the rough idle shit and I wasn't bringing it in until they have parts ordered. I'm just hoping this car lasts until 80K miles and then I'm getting rid of the piece of shit.