Hi there very long story cut short. Octavia 1.6tdi 12 plate which you feel a distinct wobble when accelerating which disapears when you lift off the pedal. Tried a while ago on here but still can't find out why. Its felt through the car/seat and not the steering wheel. Just passed an MOT with no advisories.

New tyres on front plus balanced and checked.

Rear tyres good with no out of roundness or obvious defects and look fine with 3/4tread

All bushes/ball joints good front and rear with no obvious play which I assume MOT would have picked up. MOT garage has the vibrating ramp to check.

Worse at around 40mph.

Weird thing is its worse when car is cold and improves when warm. (could this be shock absorber related?) and randomly disapears completly.

Seems worse when accelerating into corners but difficult to tell.

No rattle from DMF etc

No fault codes either plus car is going great pulls well and good MPG apart from wobble.

Engine mounts look good

Cars done 110k

Drive shafts are solid with no play and no obvious damage plus no noise from CV joints

Rear discs and pads brand new plus front fairly recent.

Any help very welcome as its stumped me including a few reputable garages. Advice was to leave it till it gets worse and hopefully become more obvious but thats been 9 months now. Have I missed something obvious?

Alasdair

No prior knowledge but injectors ?

18 minutes ago, gav_is_con said:

No prior knowledge but injectors ?

Dont think so. Car runs and pulls great apart from the wobble. No fault codes and emissions were spot on last week for MOT. Exhaust is clean and not sooty and 60mpg on decent runs.

Alasdair

2 hours ago, Alasdair1 said:

Dont think so. Car runs and pulls great apart from the wobble. No fault codes and emissions were spot on last week for MOT. Exhaust is clean and not sooty and 60mpg on decent runs.

Alasdair

Again not an expert but 1.6 injectors can be troublesome.

A wobble on throttle which goes on lift off is usually driveshaft or CV related, could be a bent driveshaft or possibly a balancer ring as I know some DS have balancers

15 hours ago, T2000 said:

A wobble on throttle which goes on lift off is usually driveshaft or CV related, could be a bent driveshaft or possibly a balancer ring as I know some DS have balancers

Front drive shafts seem solid with no noticeable play in cv joints and no noises etc but could be out of balance slightly as you said. How to check I havent a clue. Will have a good look to see if I can see any damage or balance weight if they have one is missing.

Alasdair

I'm gonna stick my neck out and say it's probably one of the inner CV's tbh, depending on how annoying it is a full driveshaft with inner and outer CV's fitted is 55-100 from J&R Driveshafts depending on type refurb with 2 yr warranty

13 hours ago, T2000 said:

depending on how annoying it is a full driveshaft

Its annoying but as we are only doing fairly short runs its not too much of a problem. Once your up to speed its not really noticeable. Will have another look and check shafts etc, Last time I checked there was as said no noticeable play and no adverse clunks etc. May have to bite the bullet and put it into a garage for diagnosis or leave it and hope it gets bad enough to work out whats wrong.

Alasdair