We've all been there: you run out of juice just before you reach your destination, causing the ICE to turn on. Question: is it bad for the car to turn it off before the ICE finishes its warmup (thus turning itself off automatically)? I've been in situations where I've sat in a parking lot with the engine running for a full 1-2 minutes before I leave the car because I'm worried that it's potentially harmful to the engine to turn it off before it finishes warming up. Any ICE experts here knowledgable enough to comment on what the best practice is? Sit in parking lot leaving ICE running or just turn it off even though the ICE has only been running for 15-30 seconds and hasn't finished warming up yet?
I'm not an expert, but the ICE is designed to run intermittently, not to maintain a steady output within a defined operating temperature range. The issue of operating temperature becomes much more important in much larger engines. This is due to potential warping of engine components due to higher thermal expansion differential within the engine. I've been running engines of all types for many decades in all types of climate extremes imaginable, and it's much more of a problem with larger engines than with smaller ones.
my only concern is the detonation some have had upon cold soak restart. for this reason, i let it run for a minute or more depending on outside temp.
Generally speaking, it's always a good idea to let an engine warm up before you put it under heavy load.
Makes sense, but if your traveling 60 mph in EV in the dead of winter and the ICE cuts on, I reckon it just has to "man up".
