Hi, I OWN a 150 cdti Sri, & I also find a little steering wheel vibration at high speeds!, like the original reviewer, been taken back to various dealerships, but always found to be no obvious problem, with all tracking, wheel balancing, tyres etc OK?. Not a major problem or major vibration, but it is there, so NO, you're not going mad. I was told the heavier diesel unit coupled with the 17's create this intermittently, depending on the road surface, and is "normal" for this car?..other Vectra C SRI CDTi owners comments on this would be appreciated, just in case only two of us are experiencing this!!
I had exactly the same problem with my Vectra vibration and pulling 2006 1.8 SRI.
The supplying dealers had it on five separate occasions, and to be honest they were useless.
In the end I paid £135.00 for a Full Wheel Alignment Check report and set up where camber balance and alignment was done, and it was worth every penny.
Don't waste your money on tire fitters to set up the alignment, when it seems in my experience they just play at it, and charge you £30.00 for the privilege, and it's usually no better.
I have a Vectra 2006 SRI 2.2 Direct. I have also experienced the vibration in the steering wheel and had no luck in getting a main dealer to listen. I had new tyres, new brakes, new wheel bearings and still nothing resolved the problem! At least I know I am not going mad now I have read posts from you guys!
Going to try the four wheel align and will let you know how it goes.
The Vectra is very sensitive to wheel balance. I had the vibration after I had the factory fit front tyres replaced, put the rear wheels on the front (still running factory tyres) and the vibration stopped. Took the wheels with the new tyres to get rebalanced, still had the vibration. Took it to a place that does wheels and tyres for motorsport, got them to balance them on their machine and problems solved.
I think most places balance wheels so they're fine at 60mph, if you go over 70 then the vibration starts to come in. You need to find somewhere with an accurate machine and an operator who's aware you need a very accurate job done.
I also have some vibration and a noise above 40mph, and it seems to come from the wheels. If I press the clutch while on the move, the noise is still present, but it slows as the car slows. A bit like having damage to a tyre; I had new Sunny tyres fitted last year, and noticed the noise soon after.
Three weeks after getting the tyres, the MoT was due, and I told the tester to check the CV (constant velocity) joints, as I felt it was coming from the F/L, but he told me they were fine. Also the bearings were OK.
Have now changed the tyres to Kumho all round, and everything is just the same. I'm at a loss; had hoped the tester would have found something, but no.