McLaren's technical staff are scratching their head over correlation issues that have dogged the MP4-28.
Expected to challenge for the title this year, McLaren struggled during the first four races as Jenson Button and Sergio Perez picked up only 23 points between them.
The team, though, are hoping to take a major step forward at Barcelona's Circuit de Catalunya this weekend as they will make a raft of changes to their car.
Managing director Jonathan Neale, though, admits they need to get to the bottom of the correlation problems if they want to not only improve this season, but also want to start next year off on more successful note.
"We are essentially trying to sort out a correlation issue," he is quoted as saying by Autosport during a Vodafone McLaren Mercedes phone-in.
"It's really important that we sort out the issues with the car and the correlation.
"All of the time you've got that lingering doubt of 'hang on a second, what went went wrong, where did it go wrong and how do we fix it?', you've got the opportunity for it to arise again."
Button was very cautious about this weekend's Spanish GP despite the upgrades to the MP4-28 admitting that he is "pragmatic".
Neale admits it's important that the team don't get carried away by the new developments as things can go wrong.
"There's good reason why both Jenson and I would want to be relatively low key," he said.
"None of us wants to be a hostage to fortune and setting ourselves up for a blow on the chin from [the media] isn't very funny.
"The other thing is we're not working in isolation here, and while of course it's very natural that people want us to predict that we're going to be on pole position, it's a tough sport and the competitors don't stand still. Quite what will be delivered depends on what everybody else will be doing.
"It's impossible to predict and unwise to try to do so."