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VIBRATION I HAVE A VIBRATION PROBLEM., IT SEEMS EVEN WORSE IN COLD WEATHER. I CAN FEEL IT IN GAS PEDLE, AND WAS THINKING IT MITE BE THE MOTOR MOUNTS COULD HAVE DRYED OUT. I KNOW ITS NOT THE WHEELS
This is caused by the fluid-filled motor mounts and transmission mounts. You are probably right in they have dried out and may need to have the fluid topped up.
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it could be center bearing, if its going bad it can also cause a vibration, make sure you have sufficient fluid in the diff as well, you can also get a noise and vibration from collapsed motor or trans mounts
IF your ****** was removed and re-installed there is a good possibility that there is a problem withe torque convertor. either it is not installed or seated properly or the weight block welded to it may have come off. Also your flex plate ( the part that your torque convertor mounts to) may be warped or bent during re-installation Hope these ideas help you out..
If it only happens in cold weather, check your intake manifold bolts for tightness. #5 & #6 by the firewall are easiest to check. Some people will find these not even hand tight = rough running car.
However, if (when cold) your car is vibrating at idle IN GEAR and stopped, this would be a motor mount on Envoys and Trailblazer, very common.
Fan shouldn't turn by itself, you may have a bad fan clutch.
Sounds like a classic motor mount / tranny mount issue. Most of the time it will be the motor mount though. The mounts may look ok but they compress over time and they need to keep the motor up higher than it is. Go with OEM mounts (as aftermarkets tend to be too soft and you'll end up having the same problem quickly) , their around $100 each, but a PIA to change.
The vibration may not be the mounts but the motor missing. What the motor with the hood open. Have your driver put the unit in gear and see how much things move touch the engine and feel the unit does the engine run smothly or does it need a tune up or vacume leak fixed. The exhaust system may be touching the car somewhere and it's transferring noise and vibration. Air conditioning lines and fuel lines can do it too. Is the check engine light on? Mixture problems can make the engine chuggle and vibrate more than normal. oxagen sensers can cause mixture ans can temperture senser lies. Even an opened too much therostate can make the system think that its cold and turn up the fuel till the motor shakes. fouling plugs and causing fuel ecomony problems and low performance problems.
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