Jean-Eric Vergne says he is confident that Toro Rosso has produced a strong car for the 2014 F1 season, despite the team continuing to be hampered by engine issues during the second pre-season test of the year in Bahrain.

Vergne failed to even make the 20 lap mark on the fourth and final day at the Sakhir circuit after encountering a problem with his Renault power plant.

Despite the further loss of track time, Vergne said he was staying upbeat about the year ahead and remained confident that Toro Rosso would be in a solid position once its current issues are resolved.

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"We had a major problem today," he said following the final day of running in Bahrain, before conceding that the issue was with the engine in his STR9. "We know there are some problems with the engine but I want to look for the positives. I was able to go out again with an okay engine and am pleased with the car behavior and when the engine is there, I think we will look okay.

"We've managed to fix some of the problems and the team has given me a chassis that I like."

Vergne added that he was confident that Renault would be able to resolve the difficulties that it has faced so far and said he was sure that things would have improved by the time teams head to Melbourne for the season opener.

"This isn't what we were hoping for but you need to go through these difficult moments, and we are trying to learn what we can," he said. "There are four days of running still to come and I have faith in the people at Viry.

"It won't be easy but we have to work hard and can having something good at Melbourne."