IAC Operating Theory Question / Low Idle in gear

[packman]

That's weird. I kinda had that problem last Fall. My idle wouldn't get so low as to stall, but it would sound like it was barely running. I would take the car home and clean out the IAC. Most of the time it was fine; sometimes it would have a much higher than normal idle that would either stay high if I fiddled with the TB screw or drop fairly low again. That all changed in the winter during one of the Polar Vortexes. We were warming the CV up and it just spontaneously started idling higher. It has since settled down a little, but still higher than it used to be.


Packman

[kishy]

That's weird. I kinda had that problem last Fall. My idle wouldn't get so low as to stall, but it would sound like it was barely running. I would take the car home and clean out the IAC. Most of the time it was fine; sometimes it would have a much higher than normal idle that would either stay high if I fiddled with the TB screw or drop fairly low again. That all changed in the winter during one of the Polar Vortexes. We were warming the CV up and it just spontaneously started idling higher. It has since settled down a little, but still higher than it used to be.


Packman

Although rare (3 times in the 2 years plus a month I've had the car), it has stalled. I had assumed other factors were involved but if it helps paint a fuller picture, here it is.
Twice in the winter, heavy electrical load (headlights, wipers, defrost blowing, radio on, rear defrost on, turn signal in one of the cases - yes it stalled as I was turning a corner in the snow). One of those times I had the 2G, the next I had the 3G, so it wasn't an electrical supply issue...one time I was on the brakes, the other I wasn't.
Once, on just a normal warm day going into gear from park. It went into gear, the idle dropped like a rock, shook around for a split second and died.

When in gear holding the brake at a stop light it vibrates a lot, if I 2-pedal it to raise it a couple hundred RPM it smooths right out, you wouldn't even know the engine was running.

Driving me NUTS.