Shudder on acceleration and braking

how many miles on her?

 

wow!

 

I had a shudder with my vehicle that occurred only in hot weather; it went away after I changed the oil, transmission fluid, ICE & inverter coolant, changed the PCV valve, and cleaned the throttle body.

 

Might be something else then, because my shudder was engine-related and went away on its own after that maintenance.

 

No doubt the crack is contributory, but what I first notice is how bent out of shape the rubber bush is.

 

I replaced all motor and transmission mounts in an older Suzuki and it truly transformed the shifting action on what I thought was a worn out trans (had already done a fluid change plus additive which worked "OK"). Also once had an old Mazda 5-speed with worn out mounts and you could actually watch the shifter move about when reving the ICE.

 

Ah, that is a shadow, then. The picture makes more sense, now.

 

I owned a 2009 Prius for more than 11 years already. The second owner since it is off lease. It is always trouble free thus I really didn't have much opportunity to get my hands on it. Busy with work and family so it is always my wife who took it to mechanic next to his workplace for oil change. More recently though, probably since 134000 miles, it started to have intermittent shuddering before completely stop or starting at full stop. The issue would cured on its own the speed goes up more than 10 MPH, or if we turn off the car and turn it back on during the stop.

The shuddering can be very bad. In the worst occasion it was like plowing the road and doesn't move at all but keep on shuddering during starting from complete stop. There's no diagnosis lights on dash except in such kind of worst scenarios the skidding light could come on flashing.

The only thing that I can recall is that it had a broken wheel bearing at the passenger front during a road trip about 2000 miles before the issue developed and that was diagnosed and fixed right before this shuddering. This shuddering is still infrequent enough so dealer couldn't diagnose. Instead their technician came up with a recommendations that pretty much covered all the moving parts and tens of thousands of dollars to start with, even on places they previously inspected during oil change and found in great shape. So I understand why people upset called them stealership. : - )

I have a OBD II scanner and couldn't find anything. A mechanic cleared the data approximately 1000 miles ago in diagnosis and there's no new data (DTC) to read. I'd prefer to start with the most likely and step-by-step to identify and fix the issue.

Thank you all for suggestions!