Question about 2000 Saturn SL

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In my 2000 Saturn SL1 I am experiencing very high idle (2000 rpm warm - higher cold). I have cleaned the throttle body and the idle air control valve with no improvement. What next, replace the idle air control valve? Any other suggestions? Thanks, Sandy R

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You could try replacing the idle air control valve but I would obtain one from a local salvage yard, its cheaper and you are not certain if thats the problem, another thing i would check is your intake manifold gasket where it meets the cylinder head, if tha gasket is cracked or leaking it will allow excess air to enter the engine and make it idle higher, the easiest way to verify this is get a can of carb and choke cleaner and spray it all around the intake gasket area, if the engines idling characteristics change drastically then the gasket is bad and needs to be replaced if theres no change in the idle I would start looking for vacumm leaks and the idle control valve issue, which you specified.

Posted on Feb 14, 2011

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Had same problem 2 years ago change idle air control clean throttle body , erg valve .It only would idle high when i left it out in the cold all night. When i leave in my garage it would not idle high. With help from a Saturn mechanic found intake manifold gasket was blown and giving me all kinds of false codes.Now its been 2 years i having the same problem again seeing this again makes me think i having the same problem again it emission time again

Posted on Dec 30, 2012

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Could be a vac leak, or a dirty throttle body, or a faulty idle air control valve. The computer controls idle speed by regulating the amount of air into the intake. Could also be something pulling on the throttle cable such as the cruise control.

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remove the throttle body (4 bolts) and then remove the idle air control (bolted to the TB, between the firewall and the throttle body)-clean the TB, the Idle air controller and remove the Throttle Position Sensor (opposite the IAC) and clean it if necessary. The IAC carbons up on these cars, as does the Throttle body-I know, I have a 99 SL with 180,000 miles, it is almost like an oil change as they get older.

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I have a Saturn 2002 SL1 The RPM remain at 2500-3000 RPM when shifting gears. After abotu 30 seconds the RPM will come down to 900 while sitting at a light. What would be the best place to start chasing...


Sounds like a dirty IAC (Idle Air Control) valve. It is located on the throttle body. Remove it and clean it throughly as well as the throttle body underside as well where a lot of carbon build up is.

However, since it is such a high idle, check for any vacuum leaks. Check your hoses and lines running inside the engine bay, specifically near the intake. Spray some carb cleaner around while the engine is running to see if you can hear or see a leak. Check the intake gasket as well.

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Sounds like a bad idle air motor (That controls idle) But you must pull compiter codes first (The computr tells it what to do)

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check all your vacuum hoses and the throttle body itself for a vacuum leaks if the hoses replace as nessasary if to check for throttle body get can of carb cleaner and spray around base of throttle body and sides not in it if idle raises you have a vacuum leak goto a good parts store and ask for a rebuild kit don't goto auto zone or advance they don't carry them

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1999 saturn sl1


Sounds like you have one of two problems. If the car has over 80,000 miles on the odometer, your idle air control motor (basically an electrical solenoid valve which allows additional air into the motor past the closed throttle valve) is sticking open.
The other possibility is a vacuum leak. I would try removing the IAC (idle air control motor) and cleaning it using aerosol carb or throttle body cleaner. This is available at any auto parts store. Re-install the valve and see if there is an improvement. If it improves but reverts to it's old behavior (usually within a day to a week) you will need to replace the valve.
Charlie

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