Ferrari drivers Felipe Massa and Kimi Raikkonen suggested they had put their team's technical problems behind them after setting the fastest times in Friday's first practice session for the Hungarian Grand Prix.
Brazilian Massa had the morning's quickest lap of one minute 20.981 seconds with Finnish team-mate Raikkonen second fastest, in 1:21.345.
The two Ferrari drivers had complained of handling problems with their cars during the team's disappointing showing at the previous Grand Prix in Germany but told reporters on Wednesday that the team had solved the problems.
Ferrari's arch-rivals McLaren were the second fastest team in the opening session with Heikki Kovalainen setting the third best time of 1:21.410.
His team mate and overall championship leader Lewis Hamilton kept up hopes of a third successive win, following his victories at Silverstone and Hockenheim, posting the fourth fastest time in 1:21.535.
Hamilton's former team mate Fernando Alonso was fifth fastest for Renault with a time of 1:21.802.
Toyota's German driver Timo Glock showed no obvious after-effects from his spectacular crash at Hockenheim, finishing sixth fastest in 1:21.931.