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MK3 idling rough and black smoke till engine heats up

Steve Gray 1
Steve Gray 1
in Ford Mondeo / Vignale Club

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Have fitted new egr and mass air sensor, idling rough and bad smoke when I change gear till engine heats up then no smoke, no em lights and I have found out that I have a mk4 ECU, any ideas please.

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    Is it the same before you changed the egr and sensor? 

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    • The Digestive Forum Roundup (24th May - 31st May 2026)

      Steve ·
      The Digestive Forum Roundup (24th May - 31st May 2026) We hope this email finds you well and enjoying your week. As always, our forum has been buzzing with activity, so we’ve compiled the highlights for you. Plenty of interesting discussions are taking place, especially around the Ford Focus and Fiesta models. Starting off with the Focus, many members have been discussing issues with the Emergency Call System, particularly in the Mk4 model. PLB raised concerns about persistent malfunctions, a se
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