Kevin Magnussen had to recover from water pressure issues in the first half of the session and Pierre Gasly tested the halo on his Toro Rosso in only his second F1 weekend.
Palmer, who has eight points this season courtesy of sixth place in Singapore, said: "My immediate goal is to get the best possible result at the Japan Grand Prix before evaluating the options available to me".
The Spaniard is now moving to Renault before the United States Grand Prix, three months earlier than planned.
"Since Renault's return to Formula 1, Jolyon has been highly dedicated in an evolving environment".
"I've been with them for three years and it's a shame not to be going to Austin with them". "I'm looking forward to working with m", said Sainz in official communiqué of Toro Rosso, where he wanted to thank Red Bull and promised to look for a big farewell in Suzuka, despite starting from penultimate position of grill.
"They did an awesome job and congratulations for that, it shows the commitment they have, and I really appreciate it".
"On my side, I will definitely do my very best in tomorrow's race".
With few seats available elsewhere on the 2018 grid, Sunday could be Palmer's final F1 race for at least the foreseeable future.
This certainly does put more pressure on Carlos Sainz Jr.to perform in better equipment.
Renault Sport has seen great performance throughout the 2017 season from their lead driver Nico Hulkenberg.
"Toro Rosso is made up of a fantastic group of people and I wish them only the best for the future". Palmer does not have a ride lined up in Formula One for the next season yet, though he is rumored to be considering a move to IndyCar in the next year.
Gasly and Kvyat are now likely to form Toro Rosso's 2018 driver line-up, although Pascal Wehrlein is considered an outside contender.