Mk2 Tdi Vibration Under Load Above 50Mph

[BigDog]

Hello all,

 

I've got a vibration when accelerating above 50mph. It is very related to load, meaning you get the vibration immediately you press the accelerator and the more you press it the worse it gets. It feels like a driveshaft inner NS CV joint worn out - I've experienced similar on a Honda Prelude. But, having just been under it and taken the under-tray off to check for CV joint or intermediate shaft bearing play, I can't feel any except for maybe 1mm longitudinally ( in line with the shaft, same both sides).  The car has had a Motormax conversion for the OS driveshaft a few years ago now and that is still good. 

 

I wondered if it could be some sort of misfire but that would surely be related to engine speed and load so happen around town too - but it never happens around town.

 

If it was a wheel bearing or wheel out of balance I think that wouldn't be load-related. I've experienced roll-restrictor problems and pretty sure its not that as no clonks.

 

Car has done 189k miles now.

 

Is there anything else to check before giving it to my friendly mechanic to try and sort without spending too much?

 

Many thanks in advance.

 

Matt

[traff]

hi there ....try packing the cv joints with grease...normally the outer ones are the culprits here....you wont feel any play..had this on one of mine ..easy fix

[BigDog]

Thanks Traff, I've got a tub of that Castrol black moly grease (years old now), will give it a go and report back. Maybe I should do the NS inner one and then if it works, the OS ones too for good measure.

Matt

[mrben]

Hello. Did you find the problem?, as this is what I believe is exactly happening to mine. Vibration getting a lot worse now, especially on power going up a hill and around a corner. Totally disappears though when you take your foot off the power...Thanks in advance.