Q: My saturn will idle at about 300-450 rpm and then eventually shut off.

asked by on

My saturn vue idles extremely low almost to the point of cutting off and sometimes it does just cut off. It only acts up when the car warms up, but when it's cold it acts ok, but still idles low. We've changed the starter, the battery, cleaned the cadalidic converter. The check engine light will start flashing and it feels as if the car loses power and it doesn't matter how much you press the gas the car won't go anywhere when it starts acting funny. We've ran the codes and nothing shows up.

Hi There, It sounds like you may have a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle’s computer and will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. This is also an important function when starting the motor as it allows the motor to run and idle on it’s own once the motor fires. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed with the help of the idle air control valve making the transition from a higher RPM back down to idle speed while adjusting the air/fuel ratio constantly to allow this to happen smoothly. When the engine RPM drops below the normal range of about ~800 RPM, this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My saturn will idle at about 300-450 rpm and then eventually shut off.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Burning oil?

Hi there. It sounds like your car has an oil issue. It sounds like it can be a combination of issues. I would usually get the vehicle in the air to check for leaks first. If it was just burning...

Q: 1995 Honda Accord - Failed emissions due to having 1500 of 900 NOx ppm. Is there an easy fix here? They are saying it will cost me

If you are producing too much NOX this means your combustion is running too hot. This is usually caused by the engine running too lean or the EGR system is not flowing enough to cool the combustion. You should remove...

Q: Battery is dead

It is possible that the weird noise you heard was either the serpentine belt coming apart, or the alternator failing. Either way, I would ask for help from one of the mechanics at YourMechanic, so they can come to your...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...