Q: Vehicle shakes during acceleration

asked by on

I have a 2004 Toyota Sienna with 150k miles on it. It starts to shake at 35mph+ (under seats, not steering wheel) only during acceleration. I'm on my 3rd mechanic including the dealership. The tires have been balanced twice. They've checked cv joints/tie rods/drive shafts, and brakes. Tires are new. Stabilizers have been replaced. I was thinking tranny but no noise/grinding/slipping. What else could this be? I have to drive cross country with kids to get home. The mechanics are stumped.

My car has 150000 miles.
My car has an automatic transmission.

Among the remaining possibilities are defective motor mounts, struts, and engine operating condition (the engine needs to be looked at with a scope under load and a compression test might be helpful, too). If there is no problem with the motor mounts, the remainder of the suspension checks out, and the engine checks out (lots to check there), then the vibration must stem from an imbalance in a rotating component, such as the torque converter or the crankshaft. If the crankshaft, vibration can occur if the harmonic balancer is defective. Based on what you are describing, the vibration is marked enough that the origin should be readily pinpointed and consequently I suggest you request a vehicle vibration diagnostic. If you have further questions or concerns, please do not hesitate to re-contact YourMechanic as we are always here to help you, particularly if you just need more information to make a wise, informed decision.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Vehicle shakes during acceleration

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Roaring or howling noise while driving my 2006 Chrysler town and country

Hello. Most of the time if you are getting a noise like this when the vehicle is moving, it is due to either a tire issue or a failing hub bearing. I always check the tire tread first. If it...

Q: What is a P013C code

This code signals an oxygen sensor slow response from rich-to-lean on bank 2 sensor 2. This indicates that when the computer cuts the fuel to test sensor output, it does not respond quick enough and the code is set. This...

Q: 2004 lexus IS300 P0010 P0122 P2138 ALSO ERASED CODE P05OO AFTER CLEANING BOTH SENSORS IN TRANNY NOW CAR OVERHEATS IDLES @2000 in p

Hi Braxdon. Thanks for contacting us today. Of the error codes you've listed, the one that might be the root source of your problems is the P2138 OBD-II Trouble Code. The P2138 trouble code indicates that the Engine Control Module...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...