1.   He parked outside the bank and kept the engine running.

2.   Jane kept the engine running.

3.   Keeping the engine running, I waited.

4.   Leaving the engine running, he then returned to the house to collect his executive briefcase and other relevant impedimenta.

5.   Leaving the engine running, he went and leaned on the railings.

6.   Once I was outside, I left the engine running and ran back to close the gate.

7.   She got out of the car and left the engine running.

8.   She left the car engine running.