Guenther Steiner is confident Haas has solved the turbo issue that wiped out its running on Wednesday and says the team will be chasing laps for the rest of testing.
Esteban Gutierrez completed a solitary installation lap in the morning before returning to the garage, failing to emerge again after an "anomaly" was discovered on the turbo. The problem eventually prevented the Mexican driver from appearing for the rest of the day, meaning reliability has limited the team to 24 laps in the two days at the Circuit de Catalunya this week.
Explaining the problem, team boss Steiner said: "We changed the turbo last night and then this morning there was an anomaly, Esteban went out for the installation lap and it didn't do what it should be doing. We couldn't just say 'change the turbo', we had to analyse and think . That was that, we had to change it again."
Asked what the plan would be for Thursday, when Romain Grosjean returns to the car, he replied: "We will just have to try and get a race simulation in and get as many laps as possible to learn what the car is doing and what other problems we have. The main aim is to get as many laps in as possible. Depending on how tomorrow goes is how we go on Friday.
"It's not a weekly plan, it's an hourly plan, so we could change tact every how depending on how we go tomorrow. Maybe we can be confident we have analysed the problem and made the fix, but you never know what is coming next. I think we will be good to go again tomorrow."
Steiner is unsure whether Haas will change its planned schedule for the next two days to help Gutierrez make up for lost time behind the wheel.
"If tomorrow goes well [for Grosjean] yes, but we discussed it and said let's get to tomorrow night and then we see what you are doing. If we have a good day with Romain we might try to do something. Maybe try to be fair with the drivers, but at the moment Esteban has more driving than Romain so they need to be equal and fair."