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Bentley Continetnal GT 2005 Intermittent Vibration From Rear

Bentley Continetnal GT 2005 Intermittent Vibration From Rear

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GAMBLER247

Original Poster:

3 posts

3 months

Tuesday 26th September
quotequote all
Hi Everyone,
I looking a buying a 2005 Continental GT Mulliner Spec, 79k full Bentley service history, 5 owners, the last owner about 15 months (who did have a Bentley service carried out whilst in his ownership). The only issue I can find - and the selling dealer agrees on this point is an intermittent vibration coming from the back of the car thru to the front when accelerating hard from 20 mph upto 60-70mph. A local Bentley specialist and Bentley Leicester have test driven the car. Bentley couldn't find the issue, however my local Bentley specialist noted the issue described but does not have an idea what the problem is. He changed the transmission fluid to no avail, next stop is diff oil but I am doubting that this is will cure the issue. The car has no fault codes stored, it's just had a minor service at Bentley Leiceter with all green health check, the wheels are all balanced and all 4 tyres are factory spec put on only 3k ago. Just wondered if anyone on here had any similar experience? and if so what remedies are suggested. Thanks in advance, Jim

LarJammer

1,503 posts

134 months

Tuesday 26th September
quotequote all
No idea but the Honda S2000 suffers with a similar issue & is caused by wear to the CV joints (lots of info on google). If the driveshafts are interchangeable you could try swapping them side to side?

threadlock

2,618 posts

178 months

Tuesday 26th September
quotequote all
GAMBLER247 said:
The only issue I can find - and the selling dealer agrees on this point is an intermittent vibration coming from the back of the car thru to the front when accelerating hard from 20 mph upto 60-70mph.
Do you mean intermittent in that it only happens on some of the occasions you accelerate, or intermittent in that it comes and goes every time you accelerate?

GAMBLER247

Original Poster:

3 posts

3 months

Tuesday 26th September
quotequote all
Thanks for the replies; regarding intermittent it is in the context of the occurence of the issue; say one time in 20 it occurs.

threadlock

2,618 posts

178 months

Wednesday 27th September
quotequote all
Could it be the road surface?
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GAMBLER247

Original Poster:

3 posts

3 months

Thursday 28th September
quotequote all
Sadly it's not the surface as the issue occurs on different surfaces,

Gerradi

380 posts

44 months

Saturday 7th October
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Best thing is to get it hooked up on a Diag.
Could be so many things, Torque Converter starting to play up, has the Fluid been changed on time, if it was was it the correct fluid? You'd be amazed how skimping on the correct fluid can mess up and cause T/Converter shudder, usually shows up after around 1200+ miles though.

Sensor going out at certain Revs/Temp , prop shaft bushes ? Does it happen after so many miles or a certain time/engine temp etc ? Such a complex car like a GT Bentley (10 - 12 year old cars like this are a ticking time bomb) you'll need a good Diag machine operator who knows those cars, anyone can hook one up but knowing the cars & being able to read the Diag machine there are few & far between...good luck...or just find another with Warranty really.

fatjon

1,930 posts

137 months

Tuesday 10th October
quotequote all
Had similar (not on a Bentley). It was caused by two distorted tyres and only occured when the "out of round" patches were both aligned side to side. There was no easily visible evidence of the problem on the car but my friend who is a local tyre fitter spotted it when he put them on the balance machine. They didn't fail to balance but the treads had a clear lateral runout and uneven wear around the circumference. A pair of new ones fixed it and it's a cheap enough diagnosis, if they don't fix it take them off again.