Williams were disappointed after putting in another woeful performance during Friday's practice for the Malaysian GP.
The Grove-based team's season did not get off to a good start in Australia with Pastor Maldonado labelling his FW35 as "undriveable."
The Venezuelan driver, though, was confident that his team would fix their problems at Sepang, however, that was not to be.
Maldonado was down in 16th place at the end of Friday's practice, 2.2s off the pace, while his team-mate Valtteri Bottas was even edged by a Marussia.
"We haven't made the progress we had hoped for today," said technical director Mike Coughlan.
"We need to look at the data we have from both sessions to maximise the package we have."
Coughlan did not ssound hopeful of find a solution this weekend saying the team will "work on some improvements ahead of Shanghai."
Maldonado, though, is refusing to give up despite lacking pace.
"We didn't have the pace today unfortunately," he said. "We need to analyse the data tonight to see what we can do.
"We have a lot of work to do but we'll be pushing hard to see what we can achieve tomorrow."