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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.
What else can I help you with?
What can cause a 2001 Saturn engine to vibrate at idle and up to 2900 rpm either driving or at standstill?
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
How do you adjust the idle on a 1999 Saturn?
Idle is computer controlled by the pcm (computer)-not adjustable.
What causes car to vibrate when ac is running but only when in idle?
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.
Why does the engine vibrate when it's in drive but not in idle?
Possible bad motor mount
What should a 1992 Saturn idle at?
Most cars typically idle between 400 to 1000 rpm
What would cause rpm to race then slow while at idle in park on a 1998 Saturn SL 2 coupe?
your airflow is uneven check the airflow sensor wire/ sensor
How do you know when the ignition coil fails in a 2002 GMC envoy?
Bad idle, lack of power. Vehicle may shake or vibrate at idle.
How do you move the idle tensioner for a 1998 3 liter dodge?
"How do you move the idle tensioner for a 1998 3 litre dodge?"
Where is the idle speed control motor on a 1998 ford escort ZX2?
where is the idle control motor for a 1998 ford escort
Why does your Volvo s40 vibrate while on idle?
The engine is running C O C K
Where is control valve on Saturn sc1?
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.
How do you change the egr valve and the idle air control valve on a 2001 Saturn?
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.
