Connect/adjust Quadrejet electric choke - need info/advice - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CCCC · 09-09-2016, 12:31 PM

Just changed to the later model electric choke version of the Quadrajet (Edel 1904) - never had an electric choke - and need some overview info.
1. I assume that the "electric" aspect serves to close the choke plate and that a heat source from within causes the adjustable spring to open the plate as the engine warms up. (If the choke operation - closing and opening - is all electric, please straighten me out here).

2. Intend to provide 12v to the choke mechanism from coil connection (or similar) but see only one connector on the choke and assume that to be the positive. What need one do for a ground?

3. No doubt the choke spring/opening aspect will need to be adjusted to this engine - and am assuming that should be done with engine at op temp, but could be wrong. What is best procedure?

if you want to save typing and cite a good post/source, that will be fine.

**truckster** · 09-09-2016, 12:40 PM

The electric choke is heated by the 12v supply, opening the spring on the choke. It's grounded through the body of the carb - you shouldn't need an additional ground. To adjust, just make sure it's closed when cold and open once the engine warms up. If it's never been rebuilt the choke probably has rivets and you won't be able to adjust it.

CCCC · 09-09-2016, 02:39 PM

Thanks for dispelling some poor assumptions and the concise info. Should be able to take it from here.

davepl · 09-09-2016, 02:41 PM

Might sound odd, but if possible I like to power mine through a relay that is only on when the oil pressure sender (if you have an electric one) shows pressure. That way if you turn the key on and the engine isn't actually running it doesn't heat the choke.

A small touch, but one I've found handy.

09-09-2016, 12:31 PM	#1
CCCC Registered User Join Date: Mar 2007 Location: San Pedro River, SE Arizona Posts: 734	Connect/adjust Quadrejet electric choke - need info/advice Just changed to the later model electric choke version of the Quadrajet (Edel 1904) - never had an electric choke - and need some overview info. 1. I assume that the "electric" aspect serves to close the choke plate and that a heat source from within causes the adjustable spring to open the plate as the engine warms up. (If the choke operation - closing and opening - is all electric, please straighten me out here). 2. Intend to provide 12v to the choke mechanism from coil connection (or similar) but see only one connector on the choke and assume that to be the positive. What need one do for a ground? 3. No doubt the choke spring/opening aspect will need to be adjusted to this engine - and am assuming that should be done with engine at op temp, but could be wrong. What is best procedure? if you want to save typing and cite a good post/source, that will be fine. __________________ CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp

09-09-2016, 12:40 PM	#2
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,976	Re: Connect/adjust Quadrejet electric choke - need info/advice The electric choke is heated by the 12v supply, opening the spring on the choke. It's grounded through the body of the carb - you shouldn't need an additional ground. To adjust, just make sure it's closed when cold and open once the engine warms up. If it's never been rebuilt the choke probably has rivets and you won't be able to adjust it.

09-09-2016, 02:39 PM	#3
CCCC Registered User Join Date: Mar 2007 Location: San Pedro River, SE Arizona Posts: 734	Re: Connect/adjust Quadrejet electric choke - need info/advice Thanks for dispelling some poor assumptions and the concise info. Should be able to take it from here. __________________ CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp

09-09-2016, 02:41 PM	#4
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: Connect/adjust Quadrejet electric choke - need info/advice Might sound odd, but if possible I like to power mine through a relay that is only on when the oil pressure sender (if you have an electric one) shows pressure. That way if you turn the key on and the engine isn't actually running it doesn't heat the choke. A small touch, but one I've found handy. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible



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