Jaguar have revealed they have given Mark Webber a more powerful engine to use in Sunday's US Grand Prix.
Webber has scored all Jaguar's points so far this season but they lie ninth in the 10-team championship.
"We've got an upgrade that we're trying with Mark, we've just built one engine and will see how it goes," said team principal Tony Purnell.
"There's always a risk when you try an engine for a first time but we need to pull something out of the bag."
He added: "We're thoroughly disappointed with the season, We started with a very nice quick car and we've been let down by a lot of small mistakes.
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MMIX
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