Having problems with your 2000 Saturn SL ?

2000 SL-1 fast idle problem during cold weather only

\015 When weather turns cold, idle tends to stay between 1,500 and 2,000 RPMs. This happens long after the engine warms up. Turning the car off for a few seconds sometimes helps to get the RPMs down below 1,000 but not always. Have already replaced the intake manifold gasket and that did nothing to correct the problem so it isn't that. Again, this problem is somehow tied to cold, outside temperatures. During the summer, the problem disappears. Any suggestions?\015 Posted / edited by AnonymousUser on : 21-01-2019

Answers :

You need to check and/or replace the thermostat and/or the temp. sensor. Take a meat thermometer and stick it in the overflow tank. The temp gauge on the dash should register above the 1/4 mark after at least 15 minutes of driving. If so, the meat thermometer should read above 180 degrees. If the meat thermometer reads 180 but the gauge isn't above 1/4, then you need to replace the sensor. If the meat thermometer doesn't read 180 or higher, then you need to replace the thermostat. The thermostat in these cars, though it doesn't fail on its own, has an unnecessary rubber gasket that fails, and allows coolant to leak past even when shut, causing the engine to not warm up thoroughly. IF the engine doesn't warm up, the idle won't come down--speaking from personal experience. I had to replace both items on my car. Now it idles fine, and after a bit of driving the gauge registers between 1/4 and 1/2, but always above 1/4. DO NOT tamper with idle adjustments unless you have exhausted all other possibilities. They are factory set, critical, and almost never need readjusting. Good luck.
I had the same problem. I took it in to a station, my EGR valve was plugged, the passages were plugged also causing the pvc valve to fail and a clogged air filter. They cleaned the throttle body and were able to clean the egr valve installed a new pvc valve and air filter. I can happily say that the car is running smoothly. I no longer have the RPM spikes and when I come to a stop the car idles around 900 rpm's.
Repair Help & Product Troubleshooting for 2000 Saturn SL

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