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2006, 130 tdci: screeching after acceleration?

538 views 12 replies 4 participants last post by  j00ce 
#1 ·
After a few years away, I've come back to a Ford Mondeo, though this time I've picked up a 2006 130 tdci Ghia, rather than the 2003 115 tdci LX which I previously had.

Anyhow... I've noticed a screeching sound occurring for a few seconds after medium/high acceleration (i.e. when the revs are dropping back). It's not particularly loud, but it does happen consistently. With lower acceleration or when cruising, this doesn't happen.

It's nothing to do with the clutch/gearbox - or at least, the noise happens when the clutch is fully engaged.

Does anyone have any ideas what could be causing this? I could probably grab some audio of it when next I'm out and about!
 
#2 · (Edited by Moderator)
Check the turbo shaft for play, A belt screeching? Check to see if having the aircon and

heater front rear screens and all your lights on at the same time affects the noise.

Any modifications? Decat or aftermarket exhaust?
 
#3 ·
Thanks for that!

As far as I'm aware, the car's completely vanilla. I'm not sure how to check the turbo shaft, but I'll have a play with the other things this weekend and see what happens.

If it is a belt, what's the most likely culprit?
 
#4 ·
Pop the inlet pipe off the turbo, the one between the airfilter box and turbo, Its on the top

at the rear and just one single clip.

Do it with a cold or cool engine, Poke your finger into the centre and you will feel the spindle

and nut in the centre. Give it a wiggle with your finger, A tiny amount of movement is OK.

Anything more than a slight rock and it may need replacing.
 
#5 ·
hi jocee . im inclined to vere towards the belt ider on this on . the most likely culprit being the left hand side as u look from fornt of car into engine bay . or . timig chain side ..belt ..the longest belt and the most tense belt due to it driving the alternator and also the a.c from the crank pulley .. .. these belt s are know in some instances to rub against parts of pulley or engine .. if wear is experienced on the pulley or guide pulley s or on the crank pully itsef .. SELdom described as screeching but it would be a fair analagie of the noise and action .... ALSO i would proffer the possibility of the DMF . even if a bit unlikely in your view . the dmf can make a wierd screechy sound if the flwheeel is excessivly worn . and this can happen on the revs backing off as described above .. but Usually this only happens when the motoro is switched off .. and the drive stops sharply on the crank pulley causing the DMF TO ocillate and vibrate making a loud friction sound screech ...s
 
#6 ·
Thanks all :)

I've not had time yet to pop the lid, but I'm hopefully going to give it a go tonight. In the meantime, I've confirmed that aircon/lights don't make a difference, and that the screeching happens when the car's not in gear, which hopefully/thankfully discounts the gearbox/clutch...
 
#7 · (Edited by Moderator)
it might discount the gearbox and clutch . but it wouldent discount the flywheel my friend .. as the flywheel is directly connected to the crankshaft it is turning as soon as the engine is cranked and continues to so do troughout the engine cycle as long as the engine is running hence if the planetry sections of the DMF dual mass flywhell are comming adrift at they are wont to do . it dosent matter really wheather you foot is on the clutch of not . the flywheel can stil ocillate and screech and cause unevern rpm .. .. s
 
#9 ·
Gah - just when I was feeling optimistic ;)

Worryingly, I've experienced two of the items on this list (http://www.talkford.com/community/topic/152968-dmf-whats-the-signs-when-it-starts-to-fail/?p=1425977) - point 1) has only happened the once, but getting the car started has taken several tries on more than one occasion.

Ah well. I should be able to check the turbo tonight. In the meantime, I did manage to capture some audio of the screech when driving to work this morning; I'll have a play later to see if I can clean it up enough to be useful.
 
#10 ·
Alas, I've still failed miserably at popping the turbo pipe, but I have managed to get some audio. The quality's not great; the noise at 00:20 is probably the most audible.



Does that sound like it's likely to be due to a DMF failure, or does it sound like a belt?
 
#11 ·
Its easy to tell if its the DMF or idler pulleys, Open the bonnet, The problem idler is on the left

of the engine as you look into the bay, the DMF is on the right.

The DMF will also vary more when you use the clutch and take up drive.
 
#13 ·
Oddly/annoyingly, the screech wasn't loud enough from outside the car to figure out which side it was on :eek13:

However, since pay day had finally arrived, I took it to my local garage and they confirmed that it was the crankshaft pulley and associated gubbins - with the driver-side wheel off, you could see the belt violently oscillating!

They've all been replaced now and the car is sounding much better and even feels like it's driving a bit better, though that might just be because I'm no longer trying to keep the revs down all the time :D

... and I even managed to pull the Sony 6CD stereo out to get it's serial code and then generate the lock-code afterwards, since they'd unplugged the battery while tinkering!

Thanks to all for the advice.
 
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