The Formula 1 grid had their first look at the new Jeddah Corniche Circuit ahead of the Saudi Arabian Grand Prix.
The issue is a vibration from the power unit, with drivers fearing nerve damage from extended stints in the car.
The Swedish driver snatched pole on his final lap after an interrupted session.
The French driver was out of contention until a blazing final attempt took him to the front of the grid.
More than 200,000 have attended the first two days of the Albert Park event.