For the past year and a half, approximately, if I go out of town and leave my car at the airport for a long weekend -- 4 days or more, when I return the battery is dead. The mechanics where I always bring my car, well, every time they check it using some computer diagnostics, the electrical system appears to be fine -- alternator, starter, etc. Even after they gave me a brand new battery at the end of December, this happened on my next trip out of town in early February.
The initial solution was just having it jumped at the airport parking lot, and it would resume working normally after that. The last two times, however, after the battery was jumped, the car killed umpteen times on the way home. The second to last time, the mechanic shop installed a new IAC valve, and I really hoped that this expensive part and the new battery would solve the whole thing. Alas, it has not. On returning from my last trip, the problem, or rather both of them, recurred -- dead battery, engine kept killing. About the engine killing, they said that they had to recalibrate the IAC valve. (Perhaps it was not properly calibrated initially.) Still, I do not understand the battery problem at all either.
It seems that the absence of electrical current somehow impacts this IAC valve, but no one at my shop seems to be able to figure this out.
If anyone could shed light on this, please let me know.
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