I have a 2012 Honda Civic EX (4 Cyl Automatic, 5-speed transmission, Regular Gasoline). I get it serviced regularly and it has around 28k miles. The engine light has never come on.
I am noticing this summer, in moderate to high humidity weather, 70 - 85 F, in the morning (when the car has been off for at least 12-14 hours), that starting is taking significantly longer than I'm used to.
I've started the car from cold on extremely cold winter days this past winter with no noticeable delay in start. But just recently I started to see this, and I'd like to know if it's something I should be concerned about.
Cold Start (12 hours or more since last run)
I put the key in, turn it to start, I hear the engine crank a few times, but then for almost a whole second (OK, maybe more like 0.6 seconds on average), there are 0 RPMs and the engine is completely silent. For that split-second, it's like the thing is dead, but then it suddenly comes to life and starts. It doesn't sound like it's starting rough, or making any kind of strange noises; it just sits there for a significant fraction of a second after it's done cranking but before it starts to run on its own.
It's to the point that, if I hold the key down in the "starting" position for the same length of time as I do when I start the car on a "Hot" start (when running the engine very recently), the car won't start. I have to intentionally hold it down until after the little hang/hitch passes, to get it running first thing in the morning.
Hot Start (started it within the past hour or two)
I put the key in, turn it to start, I hear the engine crank fewer times than on a cold start, and it jumps right to life within maybe 2 seconds max, with no delay. I barely have to hold the key in the starting position at all, it's REALLY fast.
The only thing that's alarming me is that the cold start behavior is a change from what it used to do, and this car has been through summer 2011, winter 2011, summer 2012, winter 2012, and now summer 2013. I use the recommended oil (0W-30) and usually get fully synthetic, except that the dealership's first free oil change they gave me a synthetic blend.
I don't notice a difference in any other characteristics of the engine. It doesn't run rough; MPG is excellent (just like it was on day 1 out of the dealership, in fact); it handles the load of the A/C quite well. I do usually run the car with the A/C or heat on, except for a few weeks in the fall and spring, where it's cool enough that I can turn it off, but not blasted cold.
Should I be concerned about this? Is this even a problem, or am I just overreacting to a natural side effect of my car having 28k miles on it? This is the first car I've owned since it was new, I'm used to driving old rustbuckets from the 80s and 90s, so I'm not used to seeing a car age.