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Author Topic: Vibration at speed on 2.5 v6 CDX  (Read 1966 times)

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Markie

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Vibration at speed on 2.5 v6 CDX
« on: 29 November 2007, 10:45:27 »
Strange one this, to me anyway.

Wife got new rear tyres ( brand new) about 4 weeks ago. Fronts are fine.

She started complaining about a vibration at speed about 2 weeks ago, dont know if its related to the tyres.

I took the car out this morning and there is a pretty bad vibration at 70mph onwards.

Strange thing is the front wheels have not been off and the tyres are fine on front so i doubt balancing...

Wheel nuts are all tight to the proper torque, tyres are inflated to the proper pressures.

The vibration is at around 3000rpm (ish) at 70-mph upwards HOWEVER taking the foot off the loud pedal eliminates it. Also there is no vibration at all through the steering, no noises, no pulling even under breaking and no typical puilling to the left. Also i cant reproduce the vibration accelerating hard at a lower speed to that rev range..

Tyre treads have always shown even wear....

Any input folks?
« Last Edit: 29 November 2007, 10:47:09 by Markiec »
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Markie

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #1 on: 29 November 2007, 10:48:22 »
...and i dont know why but i just sense its coming from the rear of the car.....but this may be a red herring    :-/
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Marks DTM Calib

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #2 on: 29 November 2007, 10:56:42 »
Its the new tyres I would say....faulty or poorly balanced.
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Markie

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #3 on: 29 November 2007, 11:02:52 »
Quote
Its the new tyres I would say....faulty or poorly balanced.


worth balancing them all round to see then.....purchased from mytyres.co.uk i wonder if theres any way of proving them faulty..
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bob.dent

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #4 on: 29 November 2007, 11:29:27 »
Sounds like rear wheels need balancing Markie.
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JasonH

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #5 on: 29 November 2007, 19:52:08 »
Could have thrown a wheel weight.

I had a vibration I couldn't pin down, started at about 70+ and got worse the faster you went.

Had the wheels balanced, slightly better. Disappeared when the tyres wore out and I put a new set on.
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hotel21

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #6 on: 29 November 2007, 21:08:09 »
Other option to consider is tyre badly fitted on the rim, creating an out of round flatspot.....

Look at the tyre sidewall, tright against the rim edge.  There is a faint raised line on the tyre which should be concentric with the rim edge.  If not, the tyre is not fully seated and needs to 'pop' some more....

A good blast with the airline, with tyre up in the air, should resolve that....

I would go with a bad balance, personally.....
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damon80

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #7 on: 29 November 2007, 21:55:55 »
Yep, I agree - I had the same prob with our Omega a couple of months ago.  

I've heard something along the lines of:

Vibration thru the steering wheel around 50+mph = front wheels out of balance
Vibration thru the car around 70+mph (on an, ahem, private road of course  ;) ) = rear wheels

Got the rears balanced, and - touch wood - that's solved it  :y
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Darth Loo-knee

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #8 on: 29 November 2007, 22:41:17 »
Quote
Strange one this, to me anyway.

Wife got new rear tyres ( brand new) about 4 weeks ago. Fronts are fine.

She started complaining about a vibration at speed about 2 weeks ago, dont know if its related to the tyres.

I took the car out this morning and there is a pretty bad vibration at 70mph onwards.

Strange thing is the front wheels have not been off and the tyres are fine on front so i doubt balancing...

Wheel nuts are all tight to the proper torque, tyres are inflated to the proper pressures.

The vibration is at around 3000rpm (ish) at 70-mph upwards HOWEVER taking the foot off the loud pedal eliminates it. Also there is no vibration at all through the steering, no noises, no pulling even under breaking and no typical puilling to the left. Also i cant reproduce the vibration accelerating hard at a lower speed to that rev range..

Tyre treads have always shown even wear....

Any input folks?

i was told by the tyre fitter i use that if you get wheel wobble or vibrations over 60 its your rear balancing.
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speakingclock

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #9 on: 29 November 2007, 22:46:06 »
I had wheel balance problems at the same speed-- Up to 70 fine, beyond produced a vibration. Rear wheel balance cured the problem.
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Taxi_Driver

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #10 on: 30 November 2007, 08:03:00 »
Quote
Quote
Strange one this, to me anyway.

Wife got new rear tyres ( brand new) about 4 weeks ago. Fronts are fine.

She started complaining about a vibration at speed about 2 weeks ago, dont know if its related to the tyres.

I took the car out this morning and there is a pretty bad vibration at 70mph onwards.

Strange thing is the front wheels have not been off and the tyres are fine on front so i doubt balancing...

Wheel nuts are all tight to the proper torque, tyres are inflated to the proper pressures.

The vibration is at around 3000rpm (ish) at 70-mph upwards HOWEVER taking the foot off the loud pedal eliminates it. Also there is no vibration at all through the steering, no noises, no pulling even under breaking and no typical puilling to the left. Also i cant reproduce the vibration accelerating hard at a lower speed to that rev range..

Tyre treads have always shown even wear....

Any input folks?

i was told by the tyre fitter i use that if you get wheel wobble or vibrations over 60 its your rear balancing.

Or a buckled rear wheel.....ive had that before.
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bigdods

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #11 on: 30 November 2007, 13:14:37 »
I had (ok I still have) this problem. Turned out to be two fold. First one of the rear wheels was bent out of shape. They stuck it on the balancer and you could see as it went round that it was egg shaped !. Replaced the wheel and got rid of about 50% of the vibration. The rest is down to the rear tyres wearing very oddly. They look ok but take them off and look closely using a ruler/straight edge over the width and you can see that the surface of the tyre is wavy !. The tyre boys reckoned it was because they were crappy kumho tyres and that sticking michelins on would fix it. I think its more likely to be a suspension geometry / alignment issue combined with crappy tyres (not JUST the tyres). These tyres will be worn out soon so when I get the new ones I am going to have a 4 wheel alignment done. Hopefully the problem will be gone !
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Nemesis

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #12 on: 30 November 2007, 22:53:50 »
Hi, I hate to throw dirt at tyre companies BUT I helped a friend change his font discs and pads on his VX looney Astra... (all turbo n tupperware) Anyway I commented on the "poor" state of his tyres.... from he said "My Tyres.com" they were only 6 weeks old, the side walls were cracked and the tread was delaminating (if there is such a thing), as in coming away from the casing, he raised a complaint and they changed them without hesitation! Normaly as a customer I would say great, BUT I had a problem with a Goodyear a few years ago and my experience is that the retailers and manufacturers wriggle like rabbid eels whe you have a problem with a tyre. So to the point, are these MyTyre.com guys selling boots that are sub standard or "seconds" hence the keen price???

Nem.....
« Last Edit: 30 November 2007, 22:59:46 by Nemesis »
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miggy

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Re: Vibration at speed on 2.5 v6 CDX
« Reply #13 on: 01 December 2007, 00:59:38 »
Quote
Other option to consider is tyre badly fitted on the rim, creating an out of round flatspot.....

Look at the tyre sidewall, tright against the rim edge.  There is a faint raised line on the tyre which should be concentric with the rim edge.  If not, the tyre is not fully seated and needs to 'pop' some more....

A good blast with the airline, with tyre up in the air, should resolve that....

I would go with a bad balance, personally.....


Took my alloys to leicester (Melton Mowbray) last weekend due to a same problem, two of the tyres were exactly as said, badly fitted tyres, he took them all off, heated the tyres in an oven then refitted, problem now solved, whoever fitted the tyres before had not got it right.
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