Re: Gas Smell after Remote Start.
I lived in CA for 20 years until 2006. The MTBE they add to the winter fuel costs you about 25% in mileage and only "reduces" emissions by the same amount. In my mind, that means for every mile you drive the pollution is the same number of grams per mile, you just have to spend more to buy the gas and burn more gas to do it. Then when they discovered that leaking tanks were getting into the ground water, and MTBE is carcinogenic (or some other terrible health risk), they figured that it would take more money to phase it out than it took to phase it in, and it would take years. Hmmm, money grubbers is what I say. I'm glad to be out of CA for that reason, but I also left a lot of friends there.
All engines need time to warm up. In the "old" days they had carbs with chokes, but with the advent of fuel injection and then computerized engine controls, the warm-up cycle has been greatly shortened but hasn't been eliminated. Therefore, CA can yap all it wants to and tell GM or others that warm-ups are not allowed, but the physical fact is they're a part of starting an engine cold.
Part of the physics of catalytic convertors is they need to get to a particular operating temperature before they are able to do their job. Until then, the exhaust passes through with little or no modification, including the unburned or partially burned fuel in the form of hydrocarbons, etc, and they come out the tailpipe. Can't change scientific facts no matter if they are high and mighty Californi-cators!
So, maybe instead of trying to figure out why CA is so dead set on making your life miserable, and the lives of many others as well, see if you can find the actual source of the issue. A suggestion was made to remote start it and stand at the rear of the car to see if you can detect it. If you can then you've found the source. If not, then it could be you've got a serious problem that needs attention, sooner or later.