On the 4-cylinder (2.6 liter 4ZE1 engine), it's mounted vertically, under and centered on, the intake manifold, electrical connector pointing down. VERY hard to access, much more so to remove: it's screwed UP into the manifold; it's all but necessary to remove the manifold to get to it. And watch the myriad of vacuum lines. Good luck!
At the base of the throttle body.
The IAC is located on the passenger side of the throttle body toward the rear. It screws into the housing using a 1" wrench.
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The IAC is located on the throttle body.
either bad gasket under throttle body or bad iac valve
The location of the IAC valve depends on the kind of fuel injection system you have. On the Vortec V6 (93+) it's right on top of the air intake in front of the throttle valve. If you follow the air intake tube to the motor, the IAC valve will be in the intake manifold right where the air tube meets the manifold. The wiring for the IAC valve comes around behind the throttle cable bracket and plugs into the IAC valve.
The IAC is located on the throttle body. Simply unplug the dirty IAC and clean or replace the IAC.
check for vacuam leaks if non found replace iac valve
On top of the intake in front of the throttle control. it has a two wire plug going into it.
The 1992 Oldsmobile IAC valve can be found attached to the firewall in the engine compartment. The valve will be on the passenger side of the firewall.