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when my mondeo hits 40/50mph it judders like its backfiring, is it the exhu?

when my cars hits 40/50mph its jolts like a backfire is it the exhust or something else
martin, July 2007
sounds like engine management system interfering. could also be accelerator if its a fly-by-wire type. suggest you sort it rather than keep driving.several different faulty sensors can individually cause these symptoms

ronan, March 2008
link Click here to see other fixes for Mondeo.