How does it work? Idle solenoid... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Vic1970 · 08-25-2002, 10:47 PM

Am having a little trouble understand how the idle solenoid operates... it does not appear on any of the wiring diagrams I have or can I find a book that explains it operation... (I have the 1970 service manual and the factory assembly manual) ... it is a red wire.

How does it work? ... once the key is turned on does it stay energized continuously? I understand how to adjust it ... just no sure why it is there... can someone make me smarter... thanks

Vic 1970

*Fast68Chevy* · 08-26-2002, 12:41 AM

idle solenoid usually is energized only when a/c compressor clutch is turned on to keep engine idle from decreasing,

is adjustable by turning the shaft of the solenoid that contacts the carb linkage

blue72stepside · 08-26-2002, 03:53 AM

My truck did not have air. But it had a idle solenoid, as far as your ?, yes when u turn on key it pops up when key is off it goes to rest postion this is so the butterflys close all the way to avoid dieseling or run on.

tom hand · 08-26-2002, 09:11 AM

It is a anti-deseling solenoid, it shoud push out any time the key is on. You set your idle speed with the "bolt" end of the solenoid, and have the idle screw on the carb set completely closed. Now when you turn the key off the carb closes completely, no deseling.

http://www.autotune.com/cprotest/cpc8f.html

Vic1970 · 08-26-2002, 06:17 PM

Thanks..understand it now... appreciate it...

Vic 1970

08-25-2002, 10:47 PM	#1
Vic1970 Registered User Join Date: Mar 2002 Location: Holden MO Posts: 82	How does it work? Idle solenoid... Am having a little trouble understand how the idle solenoid operates... it does not appear on any of the wiring diagrams I have or can I find a book that explains it operation... (I have the 1970 service manual and the factory assembly manual) ... it is a red wire. How does it work? ... once the key is turned on does it stay energized continuously? I understand how to adjust it ... just no sure why it is there... can someone make me smarter... thanks Vic 1970

08-26-2002, 03:53 AM	#3
blue72stepside Registered User Join Date: Aug 2001 Location: Morgan Hill, California Posts: 309	My truck did not have air. But it had a idle solenoid, as far as your ?, yes when u turn on key it pops up when key is off it goes to rest postion this is so the butterflys close all the way to avoid dieseling or run on. __________________ 72 Cheyenne Stepside 357/TH350 3.07 Posi 379HP@5500 412FT#@4000 96 1500 Work Truck 88 Chevy Van 3/4 97 Tahoe 8.5 Lift (Sons) 00 1500 LT 4x4 (Sons) 98 Ford Cobra (Wifes Car)

08-26-2002, 09:11 AM	#4
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	It is a anti-deseling solenoid, it shoud push out any time the key is on. You set your idle speed with the "bolt" end of the solenoid, and have the idle screw on the carb set completely closed. Now when you turn the key off the carb closes completely, no deseling. http://www.autotune.com/cprotest/cpc8f.html __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS Last edited by tom hand; 08-26-2002 at 09:16 AM.

08-26-2002, 12:41 AM	#2
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	idle solenoid usually is energized only when a/c compressor clutch is turned on to keep engine idle from decreasing, is adjustable by turning the shaft of the solenoid that contacts the carb linkage

08-26-2002, 06:17 PM	#5
Vic1970 Registered User Join Date: Mar 2002 Location: Holden MO Posts: 82	Thanks..understand it now... appreciate it... Vic 1970



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