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Old 03-12-2017, 05:27 PM   #2
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 45,314
 

2003 L-Series 3.0L Sedan
Default Re: Help ECTS, rough/fast idle, throttle body, 2002 SL2

Your '02 SL2 should have the correct brass coolant sensor. Every Saturn from '91-'01 have the infamous round nosed plastic sensor that fails and sends incorrect temperature signals creating hard starting, flooded engines, high idling, poor fuel mileage, erratic xmission shifts, etc.. Search threads for images of the two coolant sensors. Presuming yours is the brass one, the next likely problem is a worn out thermostat. Good coolant sensors will display accurate temps. Plug in a reader that displays client put coolant temperatures when the engine is cold, to reflect outside temps after an overnight cool down, and after a full warm up. Normal operating temps will be between 185F-205F, cooler for a worn out t-stat.

Gauge needle should be between 1/4-1/2.
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