If your problem is identical to most Saturns where at idle the idle vacillates a couple of hundred RPM and most recently I had an occurrence where the temp gauge would jump along with the tach, your problem is most likely in the temperature sensor located beneath the thermostat. It's an easy fix to replace and takes maybe ten minutes. Disconnect the air intake module at the throttle body and unclip the other end from the air cleaner. Follow the directions in your repair manual and you'll be a happy camper and save about 200 bucks from having a garage do it.
bad tps
Idle is computer controlled by the pcm (computer)-not adjustable.
The idle air control valve on a Saturn SC1 is found on the intake manifold. This valve controls how much air enters and engine and allows how high the motor can idle.
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It happened to me last week. Turned out to be the EGR valve that was not moving anymore. This valve is used when the motor is in idle which is why the motor was running almost fine when I was putting gas...
Idle air control motor circuits, target idle not reached (+/- 200),vacuum leak found
At idle 13-20 psi Key on engine off 23-31 psi
after the vehicle is warm & at normal operating temperature the idle speed should be 700 rpm +/- 50rpm
The idle speed is computer controlled and is not adjustable. If the speed is incorrect, there is a malfunction with the idle speed motor, a sensor, or wiring.
sounds like a bad iac motor(idle air control) or vacuum leak
There is no such thing as an idle air control sensor. The idle air control module or motor is located on the side of the throttle body assembly facing toward the engine.
It is integral to the idle stepper motor.It is integral to the idle stepper motor.