régime de ralenti

[alisonp]

If a car engine "fonctionne à un régime de ralenti", what is it doing, please? Idling, or something else?

Thank you!

 

[John Butters]

tourner au ralenti is to 'tick over' or idle and régime (tech) is speed,,, so your translation 'idling' seems to fit the bill

 

[alisonp]

Thank you, John. I wasn't entirely sure from the sources I'd found whether it was idling or just running slowly.