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!

 

Turbo uderboost help

Liam121093
Liam121093
in Ford Focus Club

Featured Replies

Hello

I have a Ford Focus MK2 1.6 TDCI suffering from Turbo Underboost. (no Engine Management Light)

It will run fine with plenty of boost when first started but if i go uphill and plant my foot to the floor after around 10 seconds i have almost no boost pressure left (6-8 PSI). Also if i am on the flat i can put my foot flat to the floor but if i hold it for more than 10-20 seconds i loose most boost again. If i turn the car off and on again my boost pressure will be back until the same happens.

I have checked
1. All pipes for air leaks.
2. changed MAF sensor and Intake Temp sensor
3. boost control valve 
4. actuator is holding pressure

Do you have any advice on what to check next or should i be looking at a new turbo?

Thanks in advance

  • Quote
    • 1 month later...


    did you get this sorted liam,sound like what iam having prob with

  • 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 (31st May - 7th June 2026)

      Steve ·
      The Digestive Forum Roundup (31st May - 7th June 2026) We hope you’re all enjoying your week and finding time for some time enjoying your Ford! This week, our vibrant forum has been buzzing with discussions that touch on a diverse range of Ford models, from the Mondeo to the Fiesta and Focus. Here’s a recap of some key conversations that might pique your interest. Starting with the Mondeo, user Frenchspanner shared a particularly frustrating issue relating to a 'Immobiliser Active' message appea
      Steve
      Steve
      • 146 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.