Renault have blamed their ERS for this frequent engines troubles during pre-season test, but are confident a fix will be in place before Australia.
While it is Honda’s engine troubles that have dominated the headlines throughout testing, Renault have not been exempt from problems.
All three Renault powered teams; Renault, Red Bull and Toro Rosso, have lost track time due to engine troubles.
Remi Taffin, Renault’s engine technical director, says the French manufacturer has pinpointed their ERS as the cause.
“We have a completely new power unit for 2017 and we have been mileage-limited with an element on the ERS side this week,” he explained.
“We saw some similar issues in development on the dyno, however testing on track has magnified this.
“Fixes are already underway and we expect to have them in place for Melbourne so we achieve the appropriate level of reliability for the start of the season. However this has impacted on our running here in Barcelona.”
With Jolyon Palmer seeming to run into more trouble than his team-mate Nico Hulkenberg, Renault gave the British a full day’s running on Thursday, the penultimate day of testing.
However, even then Palmer was only able to amass 53 laps on his way to tenth place on the timesheets.
Taffin added: “Today we revised our driver run-plan so Jolyon was in the car in the afternoon as well as the morning to gain more laps, as he’d experienced more down-time than Nico so far this test.
“In terms of performance we are satisfied we have taken a positive step forward and there is more to come over the season ahead.
“We are learning with every day with the car, so it is a case of continual progress.”