Why am I getting a 19.7 V reading at my IAC valve

BUBBADICKENS

MEMBER
1992 SATURN SL1

Ive been trying to get my cars idle right for over a week now. Ive replace a few vacuum lines, changed my egr valve, my ect sensor, a coil pack, took off my throttle body, took apart and cleaned, but still having an idling issue. According to my hanes manual I should be getting a reading of between 1.5 volts and 10.5 volts when I check it from the green/white and the green/black wires from my idle control valve with my ignition in the on position. Im getting a reading of 19.7 volts. Is this right?

5 Replies

WRENCHTECH

MECHANIC
20,757 POSTS

That's not possible without the engine running and even them highly unlikely. You must have your meter set to the wrong position or something.

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Wednesday, September 21st, 2011 AT 12:28 AM

SATURNTECH9

MECHANIC
30,870 POSTS

Just to add o this one habe you checked the wiring for being pinched or damaged to the iac valve?Also real common the vacuum line from the intake to the pcv getting a hole in it. Also check all the vacuum elbows on the back of the throtlle body injection and where they lead to egr solenoid canister purge solenoid and map sensor.

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Wednesday, September 21st, 2011 AT 12:44 AM

BUBBADICKENS

MEMBER
13 POSTS

My meter is set to the right setting. Shouldnt it fluctuate also? Its a steady reading. Ima check some other connections to make sure my meter aint on the fritts.

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Wednesday, September 21st, 2011 AT 1:00 AM

WRENCHTECH