Because 1998 Saturns suck. I have one, so I should know ;) Honestly, it's either your throttle, a clogged fuel line or a misfiring spark plug. It is common for the upper motor mount to wear out and cause excessive vibration especially at low RPMs. It is easy to replace yourself at a cost of about $90. It is in plain view and located on the belt and accessories side of the engine. To replace, first support the engine from underneath with a jack and block of wood on the oil pan. Second, remove the bolts on the motor mount and install new mount and the bolts supplied. Third, make sure you torque the bolts to the proper specs. That's it! It took me about 45 minutes. Immediate improvement in noise and vibration.
Fast idle motor is not working. This is allowing the idle to fall below the threshold of what it should be when the A/C is on.
Idle is computer controlled by the pcm (computer)-not adjustable.
The upper engine mount is collapsed. On the passenger side by the coolant reservoir look at the mount If you see 1/4 inch or more gap the mount is collapsed and will cause the whole car to vibrate
Possible bad motor mount
Bad idle, lack of power. Vehicle may shake or vibrate at idle.
Most cars typically idle between 400 to 1000 rpm
"How do you move the idle tensioner for a 1998 3 litre dodge?"
where is the idle control motor for a 1998 ford escort
your airflow is uneven check the airflow sensor wire/ sensor
The engine is running C O C K
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.
I suggest you contact your local Saturn dealership/service department. Saturns have a history of having problems with idle so, be sure you need the new idle control valve prior to purchase.
how can I clean the Idle Air Control Valve on a 1998 Nissan Frontier
I would look for a vacuum leak.
high idle problem on a 1997 sc1 when car is in gear
The idle is controls ONLY by the PCM. Replace your ECTS along with cleaning the Idle Air Control valve located on the throttle body.
You cannot adjust the idle in a 1998 Cadillac Catera. It is computer controlled. If the idle is not at 750 rpms then there is another problem with the engine. Check for codes with an OBD2 tester.
The idle speed is computer controlled and is not adjustable.
Around 700 RPM
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
If it vibrates at idle and runs good under under full throttle, you have a vacuum leak. It can also be defective spark plugs or plug wires.
it controls idling of car engine, without it it will not idle..
You dont adjust the Idle disconnect the battery for 10 mins and reconnect and the computer should relearn it idle .
That doesn't make any sense. But if your car vibrates at idle and stand still, then you probably have a fuel delivery or ignition problem that is causing a misfire.