Saturn Repair Problems? Ask a Mechanic for Answers ASAP
Hello, my name is***** the check engine light on? What does idle fluctuate between? Thanks.
I agree the coolant temp sensor is the most likely cause and I'd replace it. If IAC is sticking unplugging it wont help, you will need to remove iac to manually block off port to see if idle drops. But if iac fails it will usually set codes, the coolant temp sensor wont. Let me know how it goes or if you have more questions. Thanks.
No, there is no way to test coolant temp sensor without a scan tool. The throttle position sensor would also usually set a code. You can also monitor the signal wire on tps during problem to see if its higher then you know the tps is problem. Let me know how it goes or if you run into more questions. Thanks.