Vibration, occasional high idle, and other shenanigans in 2009 auto Yaris hatch

[tmontague]

Originally Posted by DarkShadowFox

do you think one of the harmonic balanicer/ dampener thingies is shot or a pully its loose or something stupid.

Likely not, they are not known to go in the yaris and the issue is intermittent.

Iirc the yaris doesnt have an IACV, it's sort of built in to the throttle body assembly and/or maf. Motor mounts could be worn, but again its intermittent. I'm pretty sure this is more of a red herring than an actual problem that needs fixing. The yaris like other cars have quirks, this is a well known one. It gets expensive really quick trying to solve them