Mercedes has abandoned its plan to introduce a new version of its Formula 1 power unit at this weekend’s Canadian Grand Prix.

The team intended to use ‘PU2’ for the first time at the Circuit Gilles Villeneuve but said on Wednesday a “quality issue” has led them to delay its introduction. The change of plan affects all three Mercedes-powered teams, which will continue to use their original-specification engines this weekend.

Mercedes now intends to supply its new engine to all its teams to the French Grand Prix.

The 11th-hour change of plan comes just 24 hours after Mercedes executive director Toto Wolff said in a team statement that the upgrade would be used by all its teams. “We are pushing hard to bring more performance to the car as soon as possible,” said Wolff at the time.

Renault has already confirmed it will introduce the ‘spec B’ version of its power unit this weekend, though it remains to be seen which of the six Renault-powered drivers will have access to it.

Honda will also bring an update to the Canadian Grand Prix for Toro Rosso. According to Honda the goal of the upgrade is increasing the power output from the internal combustion engine.

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2018 F1 season