Towards the end of 1977 Francis Grand replaced Chanet on saxophone and the trio recorded their second album, Les Trois Fous Perdégagnent (Au Pays Des...).

In November 1979, Etron Fou Leloublan toured the United States, and performances at the Squat Club in New York City and Trinity College in Hartford, Connecticut were recorded and released on a live album, En Public aux Etats-Unis d'Amérique.

Etron Fou Leloublan became a quartet in 1980 with Bernard Mathieu replacing Grand on saxophone, and the addition of multi-instrumentalist and singer Jo Thirion.

Frith produced Etron Fou Leloublan's next album, Les Poumons Gonflés (1982), on which he also guested on two of the tracks, playing violin and guitar.

Etron Fou Leloublan recorded their last album, Face Aux Éléments Déchaînés in August 1985 as a trio of Richard, Thirion, and Chenevier, not bothering to fill the recurring vacant saxophone position.