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Thread: Wobbling at 40 - 50 MPH

  
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    Wobbling at 40 - 50 MPH

    Have a 53 1.8 design. 45K miles, serviced only at GM franchised dealers.
    Before last service in July 2007, experienved wobbling senstation between 40-50MPH. GM service said I should have road wheels balanced. Have just had 4 new branded tyres and had them all balanced twice although wobble still exists. Appears to be more an engine thing as whole gearlever shakes also. Only happens durring acceleration when engine is under load, never when decreasing speed. I'm at a loss. Any ideas!

    Dave

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    There is a whole host of things that could give the symptoms that you have unfortunately...

    Worn engine mounts
    Cream-crackered driveshafts or wheel bearings
    Worn suspension components (track rod ends, bushes, etc)
    Warped brake disks (usually more prominent under braking)
    Buckled wheels (would prob be noticed while balancing tho)

    Either you or get a mechanic to check for play in the wheels, might give you a pointer as to where the problem lies
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    Thanks for your reply. I'd like to think that after only K45 miles, it isn't any of the major points you mention - although you never can tell sometimes.
    Do you reckon it is not an engine management thing?

    Dave

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    Quote Originally Posted by dsmail View Post
    Thanks for your reply. I'd like to think that after only K45 miles, it isn't any of the major points you mention - although you never can tell sometimes.
    Do you reckon it is not an engine management thing?

    Dave
    It's possible you could feel a misfire in that way, but I would have thought you'd have seen an EML / emissions light on by now if that was the case. Does the engine feel like it's running ok, ie: no loss of power, no flat spots, etc?
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    Engine is lively and smooth up to 40mph. I'm not skilled enough to be able to tell the difference between engine problem and suspension / steering /road wheel problem. Judder only exists during acceleration when engine under load. Foot of acceleator and all returns smooth again, Have no warning lights showing. Judder is accompanied by a a slight lack of power and unwillingness. Had cam belt changed at last service....wonder if they set up the timing properly afterwards??

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    Quote Originally Posted by dsmail View Post
    Engine is lively and smooth up to 40mph. I'm not skilled enough to be able to tell the difference between engine problem and suspension / steering /road wheel problem. Judder only exists during acceleration when engine under load. Foot of acceleator and all returns smooth again, Have no warning lights showing. Judder is accompanied by a a slight lack of power and unwillingness. Had cam belt changed at last service....wonder if they set up the timing properly afterwards??
    It's possible the cambelt could have slipped a tooth / been fitted one tooth out, although I would have thought you'd have rough running problems all the time if it were. Considering how many things could cause it, I'd be taking it to you local mechanic to have a proper look.
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    get up to 45 and knock it out of gear, or find a hill to go down,
    will eliminate misfire,

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    Quote Originally Posted by Gingerflyer View Post
    get up to 45 and knock it out of gear, or find a hill to go down,
    will eliminate misfire,
    How does that work then?
    Summit White Astra J GTC VXR 2.0L Petrol Turbo (276 PS) with Aero Pack and 20's

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    Quote Originally Posted by Tangoid View Post
    It's possible the cambelt could have slipped a tooth / been fitted one tooth out, although I would have thought you'd have rough running problems all the time if it were. Considering how many things could cause it, I'd be taking it to you local mechanic to have a proper look.
    Yep, I think so. GM dealer as good as washed their hands of it. Mind you, if the cam belt has been fitted wrongly by them, then they'll be the first to know about it.

    Dave

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    Quote Originally Posted by Gingerflyer View Post
    get up to 45 and knock it out of gear, or find a hill to go down,
    will eliminate misfire,
    I'd like to know how this would work?? Please explain.

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