have you had it serviced recently? your computer may be re-learning its idle pattern if any engine management sensors or devices have been replaced recently.
sounds like a bad iac motor(idle air control) or vacuum leak
May be idle position sensor.
When you here a rattling noise from the engine at idle.
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.
IT IS ADJUSTABLE BUT NOT RECOMENED IF YOU HAVE A HIGH IDLE THEN YOU PROBLY HAVE A VACCUME LEAK AND IF YOU HAVE A LOW IDLE THEN YOUR THROTTLE BODY COULD USE A CLEANING OR YOUR IAC IDLE AIR CONTROL COULD BE DIRTY
Posssibly the idle is too high. TAke the idle solonoid off of the throtle body and clean it.
check the soleinoid
To fix high idle problem on a 1996 VS Commodore, first locate the idle air control valve. Unscrew and unplug electrical connector running to the valve. Turn the valve over and clean the sensor for debris.
Check the alternator.
Idle is computer controlled by the pcm (computer)-not adjustable.
It's usually a vacuum leak.
yes. use brake cleaner to find the leak. However replace your ects and clean your throttle body. This is normally the reason for a high idle. ----------------------------------------------------------- THANKS SO MUCH FOR YOUR ANSWER!