1999 Saturn SC1 High Idle

JKINARD

MEMBER
1999 SATURN SC1
4 CYL
FWD
AUTOMATIC

Another question:My Saturn SC1 idles high AND stalls intermittently on acceleration. I checked the pcv hose and changed the pcv valve. I took off the IAC and cleaned it, same problem. I replaced the IAC (from salvage yard), same problem. Is there a way to check the IAC? Do you have a vacuum diagram?

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SATURNTECH9

MECHANIC
30,869 POSTS

So how high does it idle?Any code's?I posted a vacuum diagram for you. To test the iac you would have to use a scan tool with the correct special test saturn software that would test the iac a valve itself and the computer and wire's controling it. They have a iac tester to test the valve itself that you plug the iac into and can make it come out and retract. Have you ever changed the coolant temp sensor?

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Tuesday, March 8th, 2011 AT 6:22 PM

JKINARD

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47 POSTS

There is no check engine code warning. It can idle high and when I turn it off and start it again it will idle back down to normal.

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Tuesday, August 16th, 2011 AT 6:52 PM

SATURNTECH9

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How high is the idle?Have you checked the coolant temp sensor and the connector for being corroded?

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Tuesday, August 16th, 2011 AT 6:57 PM

JKINARD

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Not yet, I'll check it. That will make it idle high?

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Tuesday, August 16th, 2011 AT 7:23 PM

SATURNTECH9

MECHANIC
30,869 POSTS

It can cause a high idle hard start no start overheating surging dieing while driving a lot of different things to happen. You can expernice one of these on multiple symptoms.