Lotus endured another difficult day during practice for the Malaysian Grand Prix as both Romain Grosjean and Pastor Maldonado encountered problems with the E22.
Grosjean was 17th fastest in second practice and stopped on track with gearbox problems after completing 14 laps in the E22.
"We have to work and try to solve all our issues," he said.
"We are focusing on every issue we encounter. This morning we couldn't do any laps, and this afternoon we burnt a cable which stopped the gearbox from working.
"Of course I don't get out of the car with a smile when my car is parked out on track and is not working, and you do swear a little bit in your head! But as I've said before, it's only the second race of the season and we always knew we would be starting on the back foot.
"We will get to where we want to be."
Team-mate Maldonado stopped on track during first practice and was unable to get back out on track all day due to an engine change.
"Our problems today were centred around the power unit," he said.
"Hopefully we have fixed everything ahead of tomorrow and will be able to do enough for FP3 and qualifying. It's important for the team and it's important for me to be able to test the car and push a little bit, as it was not the case in the first race. It's tough as each time we're expecting to be better and better."