Question about 1993 Saturn SL2
If the car is idling high I'd start by looking for a vacuum leak. I usually start by looking at the line from the brake booster that runs to the back of your intake. I have seen the metal connection degrade and/or work itself disconnected.
If you have not replaced the coolant temp sensor on this vehicle I would do so now. There were numerous reported issues with the originals in these cars and they have been reported to cause a whole heap of what some would see as unrelated issues. They usually run about 14 bucks and are fairly easy to replace.
Posted on Nov 04, 2010
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Posted on Jan 02, 2017
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Mar 28, 2016 | Cars & Trucks
A DTC will be set if an abnormal reading occurs, P0116 for sensor performance, P0117 low input or
P0118 for a high input. The coolant temperature sensor temperature reading should closely match the
air charge/manifold temperature reading on a scan tool if the engine has not been run for over an hour.
The sensor circuit can be checked for proper voltage using a voltmeter.
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