next to the tps
throttle body
"Idle system control malfunction", which means, there is a problem with the volume of air going into your engine, via the IAC valve., If your car, when you start it, isn't accelerated up to aprox.,1000 rpm, and then decelerates in a minute or two, it´s likely the IAC valve is done for., Or if the car stays in high rpm, or dies out, then, most definetly its the IAC valve.
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The IAC is located on the throttle body.
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.
IAC - company - was created in 1995.
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.
35- idle air control (iac) valve/ circuit