May 29 (GMM) Mark Webber had another reliability scare during the final practice session before Saturday's qualifying.

After his engine failure on Friday at Istanbul Park, the back-to-back winner and joint championship leader lost a third of the 60-minute morning session.

The Australian's Red Bull crawled back to the pits on engine tickover, after his electronic throttle stopped communicating to his replaced Renault powerplant.

And when he returned to the track, Webber - whose teammate Sebastian Vettel topped the session - was among the several drivers who spectacularly spun at the notorious Turn 8.

McLaren's Lewis Hamilton was another driver having trouble with the four-apex bend, spinning and - like Felipe Massa on Friday - cutting all the way to the canvas of his tyres.

Force India's Adrian Sutil failed to set a laptime due an hydraulic problem.

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