Force India has been forced to change its testing plans for the final day at Mugello, after Paul di Resta's day two running was limited to just 14 laps due to a hydraulics problem.
The Scot spent most of the second day in the garage while the team chased a hydraulic problem, which eventually resulted in an engine change. While Nico Hulkenberg was expected to be in the car for the entirety of the final day, di Resta will make up for the lost time by taking the morning session, with his German teammate to take over in the afternoon.
"We had some faults in the data and we needed to do quite a few changes to the hydraulic system to eliminate it. [It was] a bit of a painful day," said Force India's deputy team principal Bob Fernley. "[The] problem was tracers. We were just worried it was going to cause an issue, partly safety and not wanting to cause any damage. We changed everything; the engine, the hydraulic pack. The key thing was to make sure Paul was comfortable.
"We will change our schedule, run half a day with Paul [Thursday] morning and Nico in the afternoon, to give them equal time in the car."
According to di Resta, the lack of running isn't a huge concern.
"I don't think it's massive," he said. "We're quite limited with what we were going to learn anyway, given the way the track is. It's not got that many similar characteristics compared to the tracks we're racing at.
"It would have been nice to get some more running, but these things happen. If we can get cracking tomorrow and get a full program in, we'll be OK."