Question about 1999 Saturn SL

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I HAVE A 2000 SATURN THE IDLE WILL RUN VERY HIGH AND VERY LOW ---FEELS LIKE IT WANTS TO GO OUT

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Either the idle air controller is malfunctioning or the Throttle position is-both are located next to each other on the back (firewall) side of the throttle body. If you remove the air tube from the air leaner, you can remove he throttle body:rotate the throttle bell crank and push the throttle cable out of the crank slot. Unbolt the throttle body (4-12mm bolts I think) and pull the throttle body enough that you can unplug the harnesses. The torx screws that hold the IAC and TPS can now be easily be removed. Clean everything with THROTTLE BODY CLEANER, and do a thorough job-especially the IAC, being careful not to spray the top half becasue it contains electronics that will not like being doused with any fluids. The TPS rarely shows lots of carbon buildup, but since you are there, check it out anyway.

All of this is assuming you do not have a check engine light-your problem is common on these cars and you should also replace the engine coolant sensor regularly on these cars, and the thermostat if the temp gauge is less than 1/4. I have one of these with 178,000 miles, they are great are but need some routine maintenance and a clean throttle body to run properly.

Posted on Jan 03, 2011

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Saturn ls 2000 with v6 engine 26000 miles stalls when driven 3hrs. In 96 weather and idles unstable with air conditioner on it runs Iike it is to hot but temp gauge reads below halfway mark .


try unplugging map sencer, it should be on top side of engine, a black plastic box about 2 inches wide and 3 1/2 inches long, or throttle position sencer could be bad causing engine to idle from high to low. Hope this is some help 2 you.

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1 Answer

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My 94SW had the same problem, after changing many parts with no effect, the problem went away with a new MAP sensor. And my gas mileage went back to where it should have been.

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After recharging with red tech 12a the compressor cuts in and out and the idle goes up and down. The gage on the low side at idle reads 55 and with the AC off goes up to 110.What did I do wrong?


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1 Answer

Idles high


Zab, First things first, check for any vacuum leaks, hoses that are disconnected, cracked or just plain worn out. Also check for vacuum leaks around the throttle body.
It really sounds like you have an EGR valve that is stuck open ever so slightly. The MAP sensor is a result of a low manifold vacuum. The IAC (idle air control) motor is trying to compesate and keep the engine running resulting in the high idle speed. I would remove the EGR valve and clean it gently with a brush and pick to remove any carbon build up.
Let me know, regards.

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1 Answer

2000 Saturn LS, high idle durning cold weather. (2500 rpm)


Scan for codes, post any that are found, it could be a bad TPS sensor. Could also be a build up of carbon on the top (valve) portion of the engine. Try a few cans of "Sea Foam" through the intake manifold.

Dec 27, 2008 | 2000 Saturn Ls 4dr Sedan

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