Pulsing Idle Disappears when Idle Air Control Valve is Disconnected

[Signal 2]

Originally Posted by 2knob

...What inputs contribute to the IAC actions?

Thanks for any help...

Would/could too much difference between any of the rpm settings for idle speeds (no load; elect. load and A/C) and the corresponding fuel cut on de-acceleration settings be related?

[2knob]

Originally Posted by Signal 2

Would/could too much difference between any of the rpm settings for idle speeds (no load; elect. load and A/C) and the corresponding fuel cut on de-acceleration settings be related?

I went back to the beginning and disconnected the battery.

During the learning process, the PFC was fighting the pulsing and having some success, but it seemed to be most successful under the AC load. I raised the no-load idle to 900 (think I now understand what you were saying) and the idle smoothed-out. I lowered the idle to 800 and it's deceleration to 900 and still no pulsing.

Now the problem is, that's only masking the problem (probably better than running with the ISC disconnected), but the problem still needs to be addressed. Does this help identify the real problem at all?