My 2002 mini cooper with a 1. 6l inline-4 engine at warm idle. Loops seamlessly. Recorded with a roland edirol r-09hr and edited in audacity. If you use this sample, please tell me what you did with it below! links are nice too.
Stereo recording of a honda element idling made from the inside of the car. Starts with the windows closed. Windows open halfway through the recording.
Turning on a car and let it idle for a moment, this was done outside so there is also some wind blowing which i think is nice but that can be removed if so desired. Recorded with my zoom h2n.
The sound of a car engine idling i grabbed from an old video i recorded. It didn't perfectly loop so i copied the sound, reversed it, and put it after the original sound (making a ping pong effect).