Question about 2001 Pontiac Bonneville

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Vibrates when turning to the left at low speed

Had both CV's and shaft replaced as passenger side boot was busted and all the grease leaked. Started vibrating when turning left between 5 - 25 mph. Mechanic replaced tie rods (old ones were not bad) - problem remained. Had tires balanced and rotated - no change. GM mechanic suggested the hub so a new one was installed - problem remained. GM mechanic now "thinks" its a loose bearing in the transmission.

I think its in the power steering but I am only an old "under the tree" mechanic.

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  • sayers_micha May 26, 2009

    I did take it back once and had them replace the CV and shaft as a warranty but that did not cure the problem.

    I had the brakes completely overhauled at the brake shop, new rotors, replaced one caliper and installed new pads (over 500.00)

    I then had the rims checked for possible damage and the tires inspected for possible replacement. At the same time they rotated and balanced.

    Then I took it back to the shop and had them check the struts, all suspension components and they said they could find no reason to replace as everything was "tight". Shocks and such were all OK.



    After all of this the vehicle still "vibrates" (can't think of a better word) when turning left at slower speeds - feels like the tire has a bulge or the wheel is wobbling



    The only reason I mentioned the power steering system was my lack of knowledge about the entire system. I wondered if there was some control valve that had failed - guess I should research before thinking :)

    Guess I could take back to GM transmission shop BUT that will be major $$ and they could not gurantee a cure! They "thought" it MIGHT be the problem.

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  • Master
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Hi,

There might be many reasons associated with the vibration at low speed. It might be a case of power steering pump may blew.

We cannot jump to any conclusion. Let me provide you with a troubleshoot flowchart.Follow all the steps and you would know the culprit without guessing the reason.

http://www.ifitjams.com/steering.htm

Copy and paste it in browser.Click enter.

I hope this would help you a lot.

Thanks for using Fixya.

Do rate the solution as "Fixya" if 100% satisfied.

Posted on May 26, 2009

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  • Pontiac Master
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I do not think this can be the power steering, when the fault is in the power steering you also normally get lack of steering assistance. When I talk about power steering Iam talking about power steering pump and rotary valve. When this system is malfunctioning , you lose steering power and often get fluid leaks.
See here how power steering works.
This however do not exclude completely the possiblity of a fault depending on car steering gears , even if the fault would be quite unusual. Moreover you would understand if there is a steering fault even at lower speed, or lifting the car.
The transmission fault also look odd, even stranger than the power steering, and I do not think a transmission problem and cause the car to pull on one side.
I would double check the newly installed CV joint, suspensions and shock absorber, tires, even rear tires balancing, suspension joints, bushes or components, front brakes.



Posted on May 26, 2009

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The quickest way to inspect is to drive it in low speed (UNDER 10 mph) tight left and right turns.

If you hear clicking sound then the CV shaft is bad.

It's also depending on how long the CV boot been crack.

===
If you decide to go ahead on the job then please observe safety and use jack stands to fully support the front end.

Remove wheel,cotter pin,retainer cap and larger axle nut.

Make alignments markings on the strut tower and steering mount so your front end will able to put back to alignment.

You will need an able body to do the following.

Remove the large lower strut bolts and swing the strut off the CV.

DO NOT ROCK THE CAR!!!

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Install boot,grease and the two bands.

Line up the strut and steering yoke marks

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Drive the car in low speed for 1 miles with tight turns.

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