Question about Buick LeSabre

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Shakes side to side at

2000 LeSabre shakes side to side at 38-48 mph ONLY when gas is applied past very light acceleration. You can't climb a hill without horrible shaking (not chugging). Either slow down below 40 or hold above 50. No problems coasting or braking. Doesn't matter what gear car is in. Bearings are good. Doesn't shake at any other speed or condition. No clicking when turning (CV joints). Rotated tires that were recently balanced with no change in problem. Had to replace front beat up engine mount due to this problem. Other mounts look fine. 165,000 miles on it (little ol' granny highway miles). Car doesn't wander from side2side/pull or steer sloppy.

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Bill Boyd

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What you describe may be castor wobble and is from incorrect wheel alignment
check the steering tie rod ball joints and other suspension items

Posted on Apr 07, 2017

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Anonymous

SOURCE: shakes side2side under acceleration at 38-48 mpn only

had exact same problem and had a drive shaft (????) extension replaced. This item moves in and out when the engine rotates under torque. If not able to move correctly you get this vibration. Only needed to replace the one on the driver's side - other side okay, but it was maddening that you could get the car to vibrate at 35 to 45 mph but at no other speed.

Posted on Aug 20, 2008

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Kianoosh Meratinia

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SOURCE: shakes side2side under acceleration at 38-48 mpn only

it can also be belt separation on your tire too,it acts exactly like unbalanced tire

Posted on Apr 19, 2013

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Shakes side2side under acceleration at 38-48 mpn only


Talked to Buick/GMC mechanic at the dealership claiming everyone was giving me different answers/things to replace. He said undoubtedly it was cv joint/half shaft. Changed driver's side, that fixed it. Another give away was it wasn't as bad when car was cold, but got worse as it drove a few minutes, i.e. everything got hot, expanded and therefore was looser.

The main clue was it wasn't RPM specific, bearings were okay and I didn't feel it in steering wheel so much as the whole car in a given RPM range despite gear (not the engine or front end of tranny, i.e. torque converter. Rotating tires had no effect.

Aug 04, 2008 | 2000 Buick LeSabre

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