What causes the vehicle to shake when you reach speeds of 35-40 mph and when you turn left ?

Question

What causes the vehicle to shake when you reach speeds of 35-40 mph and when you turn left ?

Answer 1

You may need a front end alignment. There are motor mounts that may be loose as well.

Answer 2

It sounds like a wheel is unbalanced especially if it is not all of the time and occurs at 35-40.  If it was all of the time I would think it is a wheel not properly positioned on the axle or a bent wheel or a shock absorber. The air pressure may also be a huge part of the left turn and shaking too! Maybe after I re-read your question it may be a combination of ALL of them.

Take your car for a "free inspection" by a qualified mechanic and ask for a price quote.

Answer 3

Good answers by all of the above.  I believe the "when you turn left" is the key.  I suspect a bad CV joint.  CV stands for Constant Velocity.  Link below explains the workings of a CV joint better than I am able.

Answer 4

tracking or one wheel isnt as pumped as the other. seems stupid but its true.

Answer 5

Tires, rims, alignment, front-end and so on, take it to a shop and let them check it out.

Answer 6

check your tires!!! or its your tire rod left side.

Answer 7

Since you only said "the vehicle", and that can be anything from an old style VW bug to a Chevrolet 3500 HD, I can only be general with the answer.  Something in a wheel or in the drive train is not in balance.  Since it also has a problem in a left turn, I would suspect a front tire problem, perhaps a CV joint going bad, perhaps a bearing.  But it *could* be dangerous.  You don't want to be going 65 down the road and have your left front tire fall off, so have your mechanic evaluate it soon.