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Thread: Intermittent vibration through the car

  1. #1
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

    Default Intermittent vibration through the car

    Now where do I start? Bought the car March 2010 with 163,700km (just shy of 102k miles) and since then replaced the following:

    March 2010: Alternator - warranty
    April 2010: Complained about juddering - got free SCV kit under warranty, they refused to replace them
    September 2010: Front wishbones, drop links, tie rods, tie rod ends, 4 wheel alignment - vibration persisted even with new tyres
    February 2011: 6 new injectors - problem persisted, lower fuel consumption
    March 2011: Disks and pads, front and rear, rear upper control arms, GM parts - problem still there
    July 2011: Steering rack gave up the ghost, my own fault for not checking for splits in the boots - problem still not solved
    September 2011: Loss of fuel pressure, replaced the SCV's - vibration still not gone, lower fuel consumption
    December 2011: Fitted a Steinbauer tuning box in hope it would help with reinterpreting the signals from the ECU and somehow make it run different - lower fuel consumption, still vibrating
    March 2012: 2 front springs, top strut mounts, drop links and ARB's -
    The mechanic said the car's suspension looks and feels sound!
    Known faults: Rattle when I lift off the clutch

    I have learnt to live with the fact that this car behaves differently every day of the week. One day it will smoke, the next day it won't. On a Wednesday morning it will decide not to vibrate much but will 6 hours later change it's mind entirely...


    When the car decides it wants to be a vibrator:
    The vibration is felt through the car at speeds higher than 30mph. Hard acceleration makes it worse. Higher speeds and power demand (full throttle in Germany for example, accelerating from 90mph in 6th) make the ride quite uncomfortable. The vibration is worse if the Autobahn has a slight bend and I drive 120+ (or even slower sometimes).

    When the car doesn't vibrate much:
    The vibration is felt at 60mph+ although not severe. Accelerating from 90mph in 6th will cause very little vibration. Speeds higher than 130 still make the car vibrate. Can feel stronger vibrations through corners at higher speeds.


    What has been happening lately is that the vibration is felt like a pulse, as if you had a switch for a lady toy...on off on off on off...It will shake for a split second, then stop while still vibrating slightly, and again shake...

    The things that haven't been checked are the engine and gearbox mounts, rear drop links, shock absorbers (these look fine and do not leak oil) and driveshafts.



  2. #2
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    I get this when accellerating from 40 to 70 in 5th....... (mines a 5 speed)

    from what I read it's most likely a slightly worn drive shaft/cv joint play, or possibly a worn lower wishbone bush.......

    mine only does it rarely so I won't worry about it until it actually gives up.

  3. #3
    Regular Member Critch's Avatar
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    Vehicle : Mk1 renault scenic... I know I know but it drives

    Trim : Basic

    Engine : 1.6 16v

    Year : 2003

    Default

    It could Be cv joints.

    I have a vibration through my steering wheel still
    And my list of parts changed is also huge.

    With a tiny and i mean tint amount of movement in n/s outer cv joint.

    You could do with having a data logger plugged in to see of its fuel etc that's causing or if it's actuall mechanical problem

  4. #4
    Regular Member Critch's Avatar
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    Vehicle : Mk1 renault scenic... I know I know but it drives

    Trim : Basic

    Engine : 1.6 16v

    Year : 2003

    Default

    It could Be cv joints.

    I have a vibration through my steering wheel still
    And my list of parts changed is also huge.

    With a tiny and i mean tint amount of movement in n/s outer cv joint.

    You could do with having a data logger plugged in to see of its fuel etc that's causing or if it's actuall mechanical problem

  5. #5
    Regular Member BigWilko's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 3.0 CDTI

    Year : 2005

    Default

    I have this also. I get a slow, what feels like a wobble at 30/35 and a vibration at about 70. Sometimes it's not there though. But as you say it comes and goes when going around corners. When i had my MOT done one of the advisories was for play in a front axle component (can't remember which one) but all of a sudden it seems to have got worse. My fear is that it might bo bang at the hub end of the driveshaft and then the loose driveshaft end might flail around smashing everything up.
    I dont' think mine is fuel related as it does it with clutch dipped going down hill

    Really strange but i've never seen a thread on this before, but all of a sudden people are complaining about it :/

  6. #6
    Regular Member BigWilko's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 3.0 CDTI

    Year : 2005

    Default

    Double post

  7. #7
    Regular Member stevie16v's Avatar
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    Vehicle : Vectra

    Trim : SRI XP1



    Default

    You need to determine if it's speed or torque related.
    If it's the same issue at a speed regardless of what gear you are in then it's speed related. Possibly wheels, suspension, steering components.
    If it feels different with different gears at the same speed then it's torque related, You're then looking at engine components
    In my opinion i reckon that it's either something bent eg driveshaft etc, buckled wheel or the cars geometry is out of line
    HTH

  8. #8
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

    Default

    The wheels were thoroughly checked when I got them fitted last week. The vibration seems to be stronger under load, but can still be felt if I lift off the throttle.

    The last time it was plugged in the fuel delivery system seemed to be working fine. Also forgot to add that the EGR was replaced in September 2011.

    How do I check if there is any unwanted movement in the CV-Joints without having to tear the car to pieces? I saw a vid on youtube where at first glance everything seemed fine, but under closer inspection (driveshafts had to be removed) the joint proved to be knackered...

  9. #9
    Regular Member Blade1000's Avatar
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    Have you checked the wheel bearings? It doesn't say in your itinary of changed parts.
    My experience with vx's is that they are quite prone to wearing out the bearings.
    And a simple jack the car up and spin the wheel check will not suffice. Imo I would look at changing the bearings, all of them!
    The other thing to check, is the lower engine/g-box mounts. These are often overlooked due to their location, and if the car has had some fair old use, chances are they are also shot.
    Guaranteed to cause vibration, but that said, mostly under acceleration!
    My first port of call, would be wheel bearings, before I go changing cv joints etc.
    Just another thought, I know some driveshafts have counterweight balances on them, not sure about your car. Maybe someone can confirm they are there?? But this could also be an issue if moved.

  10. #10
    Regular Member Blade1000's Avatar
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    Default

    DP grrrrrrr...
    Last edited by Blade1000; 30th March 2012 at 19:32. Reason: Dpost

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