Engine supplier Renault has confirmed its serious concerns about the dithering over Formula One's engine regulations for 2013.
FIA president Jean Todt wants to push ahead with the 'greener' four-cylinder turbo route, but has admitted the rules might be delayed due to concerns expressed by Cosworth, Ferrari and Mercedes.
Managing director Jean-Francois Caubet has signalled this week that if Renault's competitors succeed in postponing the new rules, he fears the French carmaker's commitment to F1 would be in doubt.
"We want to know what to do rather than delay or defer," he is quoted by Autosprint's auto.it.
"It seems to me that the situation is losing control. We understand and respect the ideas of Ferrari, Mercedes and Cosworth, but we are not willing to accept delays or to see things change in this way.
"The matter is becoming a problem," insisted Caubet. "It is not clear who is managing the sport."
Todt admitted last week that "those responsible at Renault tell me they will go out of F1" if the engine rules do not come into effect in 2013.