Question about 1993 Saturn SC1

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95 saturn sc1 all of a sudden had engine light on and the idle just went way low, also effects how tranny shifts, but will barely stay running in gear with brake on. Sometimes it starts idling fine and shifting fine. But more times it is not idling good. Cold starts it wont high idle either. this just kinda came on no real warning????

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  • 186 Answers

You either have a bad engine coolant temp sensor & connector.Located under upper radiator hose at cylinder head Yellow & black wire.Original sensor is ceramic & replacement will be brass from saturn.Also you may check for vacuum leaks at PCV hose & valve.Hope this helps

Posted on May 16, 2009

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93 saturn sc1


Try pulling the engine coolant temp sensor, They often crack not sure why but the ceramic tip cracks makes the car hard to start, the car's idle may race while shifting gears, and often smokes. The sensor is on the right side of the engine when looking at it on the head. Easy to change and get too

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