My housemate has been telling me for a couple of months that the starting interlock is going. I described how that would act (no sounds, no cranking) and she agreed that this was the case. I could never reproduce it. The other morning, at work, in 20 degree weather, I found what appeared to be a very low battery: just a click and low groan when I tried to start it. Jumping that car took two tries - it didn't turn over the first time, just groaned a bit, but started right up the second. I drove it home with the fan and rear defroster off, and then let the car sit a couple of days to make sure the battery really was bad. When I tried to start it today, same click and groan. HOWEVER, my housemate was with me this time, and she told me that this was exactly what it has been doing for weeks, and when I kept trying, after about 6 tries the starter suddenly cranked at normal speed and the car started right up. I checked the battery cables and they are not loose or corroded at the battery. The way I see it, it's one of three things, in descending order of probability:
- Dying starter.
- Loose or corroded cable connection someplace other than the battery.
- Intermittent internal open or short inside battery.
Any thoughts of a helpful nature? The alternator seems fine and I've never seen a very low battery just spring back to life like that, despite stories of them warming up under load. We always run the engine up off idle a bit, with all accessories off, before shutting it off in cold weather.