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68gmsee · 10-18-2013, 07:46 PM

There's basically two purposes - idle up and idle stop.

I can't remember if our trucks came with the idle up for A/C but the solenoid kicks in when the A/C compressor is engaged.

The idle stop engaged while engine was running to keep the idle up and disengaged when ignition key turned off to close the butterflies completely. Stopped engines from dieseling.

10-18-2013, 07:46 PM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Idle Stop Solenoid? There's basically two purposes - idle up and idle stop. I can't remember if our trucks came with the idle up for A/C but the solenoid kicks in when the A/C compressor is engaged. The idle stop engaged while engine was running to keep the idle up and disengaged when ignition key turned off to close the butterflies completely. Stopped engines from dieseling. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...