I pulled the idle control unit out and looked at it. I made the idle go up. The same thing happens when I pull the connection at the idle control valve. I measured the voltage at the connector for the ICV and only got like a varying 2-3 volts. I can feel the ICV vibrating when charged, but I have never been able to hear it click like some say it will. Is there a sure fire way to test The ICU? I have spent 600 dollars on this car in the last 2 months and cannot afford 500 more in a new ICU and ICV with Christmas coming up and what not.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual