I'm new to the club and was scrolling through old messages. I found a concern about high idle on an older LS400. The first generation cars have an older emissions system that keeps the idle high so that the engine can warm up to increase efficiency. In fact, it is beneficial to let your LS400 idle until the rpms drop to normal idle speed before shifting out of park. Shifting while the idle is high, as well as driving with cold oil in the engine, increases wear on the engine and transmission. In the morning, my 1990 LS400 takes up to 7 minutes to warm up completely. I usually just go out, start it up, go back inside, brush my teeth, and by then it's ready. I'd encourage all early LS400 owners to let their cars warm up.

Interesting. I wonder if the second generation could benefit from the extended warm up time.