When the a/c is on or defroster is on and the car is in drive at stop light or sign front end and steering wheel shakes really bad. What could the problem be? also when slowing to make right turn there's a clupping noise from driver side front. Engine mounts have been replace.
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Re: front end and steering wheel shakes
When slowing to make right turn is it more like a clicking noise, does it do it while turning or just when slowing down. If it is while you are turning it is most likely the right cv axle drive shaft popping. When at a stop with ac on does it shake if you put it in park and how do the rpms read in park or in drive. Did they change the trans mount also dont thank that is it just trying to get a better understanding so I can better assist you.
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Have a front end suspension check done to eliminate any worm ball joints -shockies- worn suspension rubbers-- steering problems. If ok have a wheel alignment done and have the rear end aligned first as it affects the front alignment. The violent wobble is castor wobble and indicates negative castor possible from sagging suspension springs. The camber is out at that results in the car following every dip in the road. The camber has to work in conjunction with the toe-in measurement and if the 2 are not correct then you will have problems.
it sounds like the front tires need balancing.if you drive the truck slowly(creeping down the road at about 5mph)and lightly holding the steering wheel do you feel the steering wheel moving back and forth.this could indicate a bad belt in a tire where as a wheel imbalance won`t show up at this low of a speed,but a bad belt will.also have the front end checked for worn front end components and wheel bearings,this can cause a bad shake too.
What you have is called death wobble. Generally it is caused by one or several loose components in the steering. You need to have all mounts including where steering box is attached to the chassis checked. Often the problem is caused by either bad ball joints or track bar ends or mounts. Wheel stud torque is also important. if any brake, tire, or other front end work has recently been done, this may be the cause. One item often suggested by shops is the steering stabilizer. It is often damaged by the shaking but if replaced will not cure the problem and will be damaged again. If everything in the front end is carefully checked and verified as good, then as a last resort, have some additional positive caster added to the front end alignment. That often helps.
You need to have the front end inspected for damaged steering components. Check your Tie Rod ends, A frame bushings and ball joints to make sure there isn't excessive wear or lose connections. If all of that is in good working order Drive down the road with a friend in the next lane over and have them look to see if either wheel in bouncing. If either wheel is bouncing you need to replace the struts. they are replaced in pairs, both sides. The front end will need to be aligned after you do this.
try the simple solution first put your front tires on back and back tires on front. check your air pressure then take it for a drive and see if any thing has changed. if so you probably have a badly worn tire. if no change have someone move the steering wheel back and forth wyle you are under the fornt of the car (dont forget to chalk the wheels) and see if any of your steering components are loose/moving. if nothing is loose and your tires are good try to bounce the front end. if you can really get the front of the car going up and down pretty easy you havce bad struts/shocks.