Megane 225 acceleration vibration issue....

[Ol’ Tarby]

Asking this for my mate who bought my megane off me....

He's had it for a month or so issue free, however it's developed a strange vibration on acceleration. I drove it on Sunday and it's perfectly fine until it comes on boost. At which point it vibrates/wobbles really badly. It's quite violent to be honest. It feels proper broken! I can't for the life of me think of what it could be.

The facts...

Performance is unaffected.
Idle has become lumpy.
Only does it on boost.
More noticeable in lower gears.
At steady speed it seems normal.
No smoke.
No fault codes.

Now, I've experienced a failing driveshaft or a failed DMF. These are the only two things I can think it might be.

Any thoughts?

 

[Bluebeard]

Tell him it's sold as seen and to delete your number?

Sounds like driveshaft/s though.

 

[Louis]

Did you leave the Mrs' vibrator under the seat?

 

[imprezaworks]

Did you leave your vibrator under the seat?

 

[Ol’ Tarby]

Tell him it's sold as seen and to delete your number?

Sounds like driveshaft/s though.

He's my best mate. He doesn't want anything from me, I'm just trying to help him diagnose it as it's completely stumped me

Did you leave the Mrs' vibrator under the seat?

c**t x

c**t x

 

[bashracing]

With it effecting the idle, I would guess at dual mass flywheel is on its way out.

 

[JB21]

As mentioned driveshaft(s) or DMF, if the latter you can normally hear it rattling at idle.

@james24785 are you back in the Clio then?

 

[jamesycc]

Builds speed, more vibration. Something rotary I would imagine.

As mentioned, dmf, driveshaft, clutch bearing, hub bearings, swivel joint??

Not engine obviously if its boosting ok.

 

[incy-spider]

Could be as simple as the top engine mount collapsed, get that a lot. Not so sure if it would be more noticeable on boost though...

 

[imprezaworks]

Sounds like you got rid at the right time


Hope you sort it

 

[Ol’ Tarby]

Could be as simple as the top engine mount collapsed, get that a lot. Not so sure if it would be more noticeable on boost though...

It's got a powerflex top mount mate so think we can rule that out.

I say it's lumpy on idle, but it could be how it's always been to be fair. There's no noises on idle or when cruising. It's literally as soon as you put your foot down and boost builds, you get a horrible rumble/vibration

 

[Ol’ Tarby]

As mentioned driveshaft(s) or DMF, if the latter you can normally hear it rattling at idle.

@james24785 are you back in the Clio then?

No mate the Clio went to the same mate. He then sold it and bought my megane

 

[JamesBryan]

Dual mass flywheel are w**k on these.

 

[incy-spider]

It's got a powerflex top mount mate so think we can rule that out.

I say it's lumpy on idle, but it could be how it's always been to be fair. There's no noises on idle or when cruising. It's literally as soon as you put your foot down and boost builds, you get a horrible rumble/vibration

Ah, okay... just thinking of things that haven't been mentioned and easy to check. Another one I had once was exhaust touching underneath when accelerating, horrendous vibrations and rumbling! Worth a check

 

[Ol’ Tarby]

I think this is one of those unable to diagnose over the internet kind of things

 

[Louis]

I think i was pretty close.

 

[Ol’ Tarby]

I think i was pretty close.

Probably the best suggestion in here tbh mate

 

[incy-spider]

I think this is one of those unable to diagnose over the internet kind of things

You never know!