Sebastien Bourdais was quickest for Peugeot in both the Friday practice sessions ahead of this weekend's Intercontinental Le Mans Cup round at Imola.
The Frenchman led Audi's Timo Bernhard by just under half a second in the dry morning session.
Rain then delayed afternoon practice, and only half the field ventured out when it did get underway, with Bourdais again setting the pace.
The AF Corse Ferraris were quickest in GTE-Pro in the dry, with Marc Goossens and Marco Holzer's Prospeed Porsche on top in the wet.