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Fiesta engine idle problem

bobby
bobby
in Ford Fiesta Club

Featured Replies

Hi

I have a mk4 fiesta (1996) which has a problem with the engine idle speed when the car is moving. Whenever I change gear the engine over revs massively, and more concerning is that sometimes I have to drive with my foot on the brake in order to maintain a constant speed. However, the idle behaves normally when the car is stood still (ie normal tick over, and revs fall away as you'd expect).

I took my car to a garage, and they changed the road speed sensor on the gear box, which did nothing to help the situation. They then suggested it was probably the ECU which needed replacing, which would be a very expensive job and probably not worth it. Can anyone confirm this, or give an alternative diagnosis?

Thanks

  • Quote
    • 2 weeks later...


    Hi mate,

    I have the same issue, but with the addition of it never starting first time without the help of the accelerator.

    From my research i've been hearing alot about the idle air valve controller, I'll hopefully get a chance to try this out tomorrow.

    Danny.

  • Quote
    • Author

    It's nice to know I'm not alone! Let me know how it goes.

    Cheers

  • Quote

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    The "Digestive"

    • 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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