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!

 

Fiesta has a flat spot

Joshua lee
Joshua lee
in Ford Fiesta Club

Featured Replies

Anyone got any advice on this. At 4000rpm I have a flat spot when looking at live data the map and maf pressures both drop off at that point. Photos attached 
 

fiesta 1.5tdci 75bhp remapped with the EGR and DPF mapped out 

IMG_3916.jpeg

IMG_3915.jpeg

IMG_3918.png

  • Quote


    Sorry but the key word is "remapped" as, to me, that could easily be the problem needing whoever remapped it to check their work by testing on rolling road if that was how it was done?

    Engine looks cold - does it change when it's up to temperature?

    How can MAF drop (if reading correct) unless something is restricting the induction or turbo control is incorrect?

    What about other live data like fuel pressures etc?

    Just guesses!

    Good Luck on your next MOT with those parts mapped out which must include a massive change to the programming? (but that's just me)

  • Quote
    1 hour ago, Joshua lee said:

    Anyone got any advice on this. At 4000rpm I have a flat spot when looking at live data the map and maf pressures both drop off at that point. Photos attached 
     

    fiesta 1.5tdci 75bhp remapped with the EGR and DPF mapped out 

    My advice? Put it back to how it was.

  • Quote

    Looks like a bad remap to me too.

    232kPa is about 34psi.  That seems high to me and the PCM may be cutting boost at that point as a safety measure.  Do you know what the standard boost was before the remap?

  • 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
      • 120 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.