The other day when I was adding oil, i left the filler cap sitting on the radiator and forgot to put it back on . I didn't notice until the car was hesitating and I found the cap still sitting on the radiator. I drove the car like this for 2 days. Did any engine damage result?

 

Been there, done that...one time comming home from school i noticed a little smoke behind me as i was almost home...popped the hood once i was home and saw the cap sitting in my spark plug wires and a little oil on the valve cover and headers.

How has your oil pressure been? How much oil is left in the pan??? If you still had pressure or a few qts of oil left you should be ok...

 

Just... eliminate your worry and do another oil change and put the cap on at the end

I would not worry unless you lost a lot of oil - which I doubt you did. Just check the level when you do the change.

 

Ya I did that when I used to have a cutlass. No biggie.

Nate