For a few races in 1978, Ertl entered with Ensign, but things were even worse there, with the cars failing to finish or even worst, when he did not survive prequalifying at Monza.
Nalgunhas carreiras en 1978, Ertl participou con Ensign, pero as cousas aí aínda foron peor, os coches non terminaban ou ata peor, cando non precualificaron en Monza.