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Help with my Mondeo :(

Discussion in 'Motors' started by LiE, 8 Apr 2010.

  1. LiE

    Capodecina

    Joined: 2 Aug 2005

    Posts: 22,257

    Location: Milton Keynes

    I have a small niggling issue with my car - it's a 2004 1.8 Mondeo. The issue is quite weird, so sorry if I don't explain it well.

    The scenario is thus. I'm cruising along at any speed, and slow down by braking or taking my foot off the accelerator. I've slowed down to my desired speed, and so put my foot back on the accelerator to carry on. Now, as soon as I press the accelerator, there is a slight jerk/clunk as I press the peddle. The best way to describe the jerk is as if something has engaged roughly, very similar to bringing the clutch up unsmoothly.

    I don't know if it's related or not, but I'm finding it very hard to drive the car smoothly. When changing gears and bringing the clutch up slowly, there is still a jerk.

    Any help would be great.
     
  2. Phil W

    Sgarrista

    Joined: 19 Oct 2002

    Posts: 9,945

    Location: Jupiter

    Nackered engine mount/bush?
     
  3. ajstan

    Wise Guy

    Joined: 3 Jan 2009

    Posts: 2,056

    Location: London

    Is the clutch near the end of its life? I think sometimes they get a little fierce when they are near to the end of their life.
     
  4. End Creditz

    Wise Guy

    Joined: 8 Apr 2003

    Posts: 1,136

    Location: NFA

    As above and also could be an exhaust mount. I had a similar thing going on with my golf and it turned out to be a cracked exhaust mount which was a 5min welding job to sort.
     
  5. LiE

    Capodecina

    Joined: 2 Aug 2005

    Posts: 22,257

    Location: Milton Keynes

    I don't know enough about engines, does anyone know what occurs within the engine when you brake/take your foot off the accelerator? I can also feel a jerk after a few seconds of deacceleration. It's almost as if something is de-engaging unsmoothly and re-engaging unsmoothly every time I slow then press the accelerator peddle.
     
  6. paradigm

    Caporegime

    Joined: 26 Aug 2003

    Posts: 36,809

    Location: Staffordshire

    When you release the throttle, the engine stops being under load, and will shift on its mounts to rest back into a natural position.

    When you press the throttle again, the movement of the internals, as well as pressure exterted through the gearbox, will cause the engine to rotate slightly on a pivot around the crankshaft. The engine mounts are supposed to be cushioned (by means of rubber stops usually), but if one is failing, the resultant forces could generate a bump or bang. The same could also be said for a loose mount.
     
  7. Matt82

    Capodecina

    Joined: 13 Mar 2004

    Posts: 16,600

    id guess engine mount

    does a duel mass flywheel ever give symptoms like this?
     
  8. LiE

    Capodecina

    Joined: 2 Aug 2005

    Posts: 22,257

    Location: Milton Keynes

    Thanks for the replies, I'll have a look at the mounts/bushes.
     
  9. iaind

    Capodecina

    Joined: 26 Feb 2009

    Posts: 14,814

    Location: Exeter

    Nope, its pretty rare for the petrols (especially the small ones) to throw a DMF too due to the lower torque. DMF is a rattling, or squealing clutch, or difficulty starting.

    FWIW, my old Mondeo used to do something similar - you couldnt feel it but could hear it with the window open, a noticeable drivetrain clunk. That was before and after DMF replacement, not sure what it was but never thought of it as a problem
     
  10. Thomas. PLease.

    Soldato

    Joined: 5 Jul 2007

    Posts: 5,364

    Location: London

    Sounds a lot like engine mounts to me as well.
     
  11. blueboy2001

    Mobster

    Joined: 18 Oct 2002

    Posts: 4,883

    The rear brakes tend to clunk a little on Mk3 Mondeo's - both of the ones I've had have done it when coming off the brakes and on to the throttle.
     
  12. LiE

    Capodecina

    Joined: 2 Aug 2005

    Posts: 22,257

    Location: Milton Keynes

    I'm not so bothered about noise, but the jolt every time I come off and back onto the throttle is very annoying, especially when crawling along in traffic.
     
  13. Pookie Bear

    Soldato

    Joined: 28 Jun 2006

    Posts: 5,211

    Location: Newcastle upon Tyne

    I have just bought myself a petrol 2004 1.8 Mondeo and haven't noticed the same issue - but I'm gonna keep an eye/ear open now!
     
  14. Mon

    Hitman

    Joined: 22 Oct 2002

    Posts: 636

    Location: Bristol

    Just had this start happening on mine Mk3 Mondeo, assumed it to be the engine mounts although not looked into it.

    Anyone know how easy they are to replace?
     
  15. LiE

    Capodecina

    Joined: 2 Aug 2005

    Posts: 22,257

    Location: Milton Keynes

    I've not got time till next weekend to get my car looked at, so if you find anymore info on this Mon please update :)
     
  16. Mon

    Hitman

    Joined: 22 Oct 2002

    Posts: 636

    Location: Bristol

    msm, Will update you when I know more although didn't get time this weekend had other stuff to sort first.

    May look this weekend but I'm fairly busy atm so not sure when I will get time, let me know also if you find out whats up.