Diagnostic Aids

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

After starting the engine, the ECT sensor temperature should rise steadily, then stabilize after the thermostat opens.
Test the ECT sensor at various temperature levels in order to evaluate the possibility of a skewed sensor. A skewed sensor can result in a driveability condition. Refer to Temperature Versus Resistance - Intake Air Temperature Sensor .
Inspect for the correct operation of the engine cooling system and verify the correct coolant level.