Skip to content
View in the app

A better way to browse. Learn more.
Ford Owners Club - Ford Forums

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.



Join the Independent Ford Owners' Club

Our community has been built by enthusiasts, for enthusiasts, and proudly run by Ford owners' for over 18 years. As an independent, non-official club, everything you’ll find here, advice, support, and opinions, comes directly from members with genuine Ford ownership experience.

Join our friendly community... it's Free!

 

Help diagnosing a misfire

Jbbur
Jbbur
in Ford Fiesta Club

Featured Replies

Hoping you lot can help me diagnose a problem please. My mechanic unsure how to progress, thought I’d approach people who know the engine.

2013 fiesta 1.0 ecoboost. Engine and turbo replaced by Ford in 2020, around 50k miles on this engine. Serviced every year. 

Car has recently developed a misfire. Happens reliably when maintaining revs over around 2.5k and is most noticeable on wide open throttle. Car will judder and code reader has confirmed misfire. If I hold the throttle open it will be unable to gain revs and flashes an EML which disappears off dash when I back off the gas. It appears to put the car in limp mode where it’s like it’s not boosting and, for some reason, it will force the stop start feature to disable. 

My mechanic read the codes. Confirmed misfire, one related to boost which was cleared and didn’t come back and from memory one related to ignition which made him think spark plugs - just had these replaced and no improvement. 

The car drives fine under 2.5k however anything about 70mhp or any hard acceleration is out of the question. I’m having to baby it around with gentle throttle application to avoid upsetting it. 

Any ideas? Thanks in advance.

  • Quote


    Faulty coil would be my next step.  The diags should tell you which cylinder is misfiring so you only need to change one coil.  You can swap the bad one with a good one to see if the misfire moves to the other cylinder.

  • Quote
    • Like 3

    Yeah, classic symptom of failing coils or plugs. You've ruled out the plugs so swap the coils round as suggested.

  • Quote

    • Latest Deals

    Ford UK Shop for genuine Ford parts & accessories

    Disclaimer: As the club is an eBay Partner, The club may be compensated if you make a purchase via the club

    Join the conversation

    You can post now and register later. If you have an account, sign in now to post with your account.

    Guest
    Reply to this topic...
    Go to topic listing

    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
      Steve
      Steve
      • 117 views





    Background Picker
    Customize Layout

    Account

    Navigation

    Search

    Search

    Configure browser push notifications
    Chrome (Android)
    1. Tap the lock icon next to the address bar.
    2. Tap Permissions → Notifications.
    3. Adjust your preference.
    Chrome (Desktop)
    1. Click the padlock icon in the address bar.
    2. Select Site settings.
    3. Find Notifications and adjust your preference.