Why do some cars have “steam” coming out of their exhaust when it’s cold but others don’t?

Question

I was at a stoplight, the outside temp was around 35° F but only one car had steam coming from their exhaust pipe. Every car is “hot” as the engine is running and I don’t understand why every car doesn’t.

In: Other

Answer 1

I can think of two causes:

1. that car hasn’t been running very long and it’s not done evaporating the water left in the exhaust from the last time it ran. A hot engine with a hot exhaust shouldn’t expel visible water vapor unless it’s super cold and condensing imediately

2. the car has an issue with the engine