Idle help - When AC is on truck dies - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bubsco · 02-20-2005, 10:27 PM

Looking for a little help.

I have my 350 with automatic idleing just right. When I turn the AC on, it drops about 200 and many times the truck dies. I hear that there was/is an original or after market option to solve the problem. Something to do with with either electric or vacuum signal to the carburetor that rasies the idle when the AC is on. I am currently runing a Holley 600. Will replace it to solve the problem.

I don;t really want to idle it fast to keep it runnig when the AC is on.

Anyone heard of the problem and how to solve it.

RainFade · 02-20-2005, 11:53 PM

You need an idle compensator selenoid, wired to the hot on the ac compressor clutch it'll kick up the idle when the compressor is engaged.

selenoid

72402 · 02-20-2005, 11:57 PM

Quadrajets had a fast idle solenoid. Bracket mounted to the front of the carburetor. Power came from the compressor clutch circuit. When the compressor clutch kicked in, the solenoid pushed the throttle open a little to compensate for the extra load. You'd have to fabricate a bracket to put one on a Holley, but it should solve your problem.

72402 · 02-20-2005, 11:58 PM

Dang, too slow.

RainFade · 02-21-2005, 12:05 AM

Quote:

Originally Posted by 72402

Dang, too slow.

But at least you can spell solenoid.... I need to step away from the computer and call it a day

68speedalert · 02-21-2005, 01:58 PM

Be a good idea to replace the Holley with a Q-jet or Edelbrock anyway. My history with the Holley 600 is not a good one.

Steve

Bubsco · 02-28-2005, 08:47 PM

Thanks for the help, I continue to hear about these Holley's, I'm going with the Edelbrock ...

02-20-2005, 10:27 PM	#1
Bubsco Registered User Join Date: Nov 2004 Location: Grapevine Texas Posts: 29	Idle help - When AC is on truck dies Looking for a little help. I have my 350 with automatic idleing just right. When I turn the AC on, it drops about 200 and many times the truck dies. I hear that there was/is an original or after market option to solve the problem. Something to do with with either electric or vacuum signal to the carburetor that rasies the idle when the AC is on. I am currently runing a Holley 600. Will replace it to solve the problem. I don;t really want to idle it fast to keep it runnig when the AC is on. Anyone heard of the problem and how to solve it. __________________

02-20-2005, 11:53 PM	#2
RainFade Registered User Join Date: Nov 2004 Location: Central Ohio Posts: 215	You need an idle compensator selenoid, wired to the hot on the ac compressor clutch it'll kick up the idle when the compressor is engaged. selenoid __________________ 71 K20 350/350/205, dealer air, 4" lift, Flowtech,Edel 1406 on 2101, procomp HEI,4.10's, 33x12.50x16.5 BFG MT's on slots. 4 wheel disc brakes. My lame K20 page My lame Eaton disc brake page Last edited by RainFade; 02-20-2005 at 11:56 PM. Reason: hosed up link... removing

02-21-2005, 01:58 PM	#6
68speedalert Semi-Senior Member Join Date: Feb 2003 Location: Washington, MO Posts: 390	Be a good idea to replace the Holley with a Q-jet or Edelbrock anyway. My history with the Holley 600 is not a good one. Steve __________________ '68 50th Anniversery LWB Custom Fleetside, '77 305 v-8, turbo 350, factory speed alert (still works), '71 drivetrain w/front discs. Some call it ugly yellow, others call it Ochre '83 Jeep CJ-7, <80,000 miles, original owner '04 Chevy Suburban, 4x4, 2500, 6.0 ltr, Predator Diablo programmer '95 GMC K1500 Extended cab

02-28-2005, 08:47 PM	#7
Bubsco Registered User Join Date: Nov 2004 Location: Grapevine Texas Posts: 29	Thanks for the help, I continue to hear about these Holley's, I'm going with the Edelbrock ... __________________

02-20-2005, 11:57 PM	#3
72402 Registered User Join Date: Nov 2004 Location: Cameron, Oklahoma Posts: 199	Quadrajets had a fast idle solenoid. Bracket mounted to the front of the carburetor. Power came from the compressor clutch circuit. When the compressor clutch kicked in, the solenoid pushed the throttle open a little to compensate for the extra load. You'd have to fabricate a bracket to put one on a Holley, but it should solve your problem.

02-20-2005, 11:58 PM	#4
72402 Registered User Join Date: Nov 2004 Location: Cameron, Oklahoma Posts: 199	Dang, too slow.



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