Yaris is shaking :(

[CTScott]

Originally Posted by dragoonmc

Did you recently disconnect the battery?
I did that last night and noticed it shaking bad at idle now and in didn't before but I kind of remember it doing this the last time I disconnected the battery and expect it to get better soon

If it doesn't get better quickly on its own, then clean the throttle body. There is a TSB about rough idle after disconnect where the solution is to clean the carbon deposits from the throttle body.

[racerb]

CTScott may be right on the money on this one, my old Rav4 used to do that until I cleaned the throttle body and MAF sensor, but be very careful with the MAF it's pretty delicate!! Worst part on the Rav, was it would actually cause the throttle butterfly to stick making taking off from a stop worse than the FBW hesitation!!

racerb

[33OH]

Originally Posted by CTScott

If it doesn't get better quickly on its own, then clean the throttle body. There is a TSB about rough idle after disconnect where the solution is to clean the carbon deposits from the throttle body.

Did this, no avail. Any other thoughts?

[CTScott]

Originally Posted by 33OH

Did this, no avail. Any other thoughts?

Hmm if that did not help, it could be any of the above (MAF, coil pack going, etc. or it could be a fuel issue (dirty injectors, plugged filter).

[CrankyOldMan]

Originally Posted by CTScott

If it doesn't get better quickly on its own, then clean the throttle body. There is a TSB about rough idle after disconnect where the solution is to clean the carbon deposits from the throttle body.

This. I've had rough idle and stumbling acceleration for a few weeks now, with the occasional P0300/P0301/302/303/304 and the odd P0171. Finally got tired of it stalling at intersections and pulled the TB off. Not unreasonably filthy overall, but enough had built up around the rim to prevent it from getting the right amount of air at idle, as well as some sticking when opening/closing. I disconnected everything but the coolant lines because the TB cleaner specifically said NOT to use it on forced induction systems. A few squirts of cleaner and a minute with a shop rag cleaned it right up. Idles just fine now and responds much better to pedal inputs.