Please help with late model Q jet problem... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mikep · 07-15-2002, 11:21 PM

I picked up a "new" Holley rebuilt quadrajet from a board member and its not really what I was expecting. I was going to use it on my new motor but I don't know if I can or not. I'm not too well versed in late model Qjets but this appears to be a computer controlled carb. does anyone have any idea what the electrical connections are on this thing? Are they mixture controls or will it function without them being connected. I think one of the hookups is a throttle positioning sensor but I have no idea what the other one is. If they are just feedback circuits to the computer to control spark advance I assume I can use the carb as is. If they are mixture contol selenoids then I am screwed. Anyone have a guess? The numbers on the carb are

17082253
1562 DTK

mikep · 07-15-2002, 11:21 PM

Heres the front

Blue_71 · 07-15-2002, 11:33 PM

that looks kind of like the carb on the 74, but i dont really know... heres a link that might help
http://www.holley.com

**truckster** · 07-15-2002, 11:59 PM

It looks like the standard connector for the computer-controlled Q-jet. It has electronic metering.

mikep · 07-16-2002, 12:21 AM

So I'm screwed. Great!

Longhorn Man · 07-16-2002, 12:23 AM

Take it back?

70shortnphat · 07-16-2002, 12:35 AM

Deffinetly give it back! Those electronic feedback carbs suck even when they are on the proper vehicle.

slam33 · 07-16-2002, 12:45 AM

Put an Edel on it and be done with it. Q-jets were the worst carb ever built. When I had my parts house, I had a carb rebuilder. He built carbs all day long, we had more Q-jet parts than any other carb. They were a pain to rebuild and a pain to get running right.

mikep · 07-16-2002, 01:03 AM

Iv'e had a dozen or more carters over the years and theyre good carbs but I'm building this more for mileage and the edelbrock ( carter ) is not as good as a spread bore quad in good tune for mileage. Obviosly this one isnt what I am looking for but Quads arent that hard to tune. Theyre not evil but theyre really not that difficult to work on either.

O'l Buck · 07-16-2002, 01:07 AM

it will run, but those carbs are POS....I had a 83 cutlass for a while that had the computer controlled carb and dizzy, sh!tcanned the dizzy, put in a regular HEI and disconnected the wires from the carb, the electronics control the fuel suply to the primary jets, but when they have no power to them, the fuel is wide open.

It will run, but you won't be happy with the performance of it.....my advise is to get rid of the carb, and go with a correct QJ, or edelbrock.

tom hand · 07-16-2002, 10:47 AM

Depends on want you want,and how much you like to work on carbs. The only thing different about that carb is it had a computer controlled enrichment circut to make up for the fact the to pass emissions they ran them so lean they would barley run. You can make it work on a "regular" motor and it even has one advantage. First the air valve has a stop that must be ground off to get full airflow. From the looks of that picture it might have allready been done. Second that carb has an adustment on the metering rods for adjustment that is pretty cool. I would stick it on your motor and see how it runs. From the looks of the picture it has been modified, I don't think it is legal for Holley to sell a computer controlled carb in that condition will all the anti-tamper plugs removed. Check out this link it might help.

http://duzy.8m.com/monte/ccquadrajet.htm

07-15-2002, 11:21 PM	#1
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	Please help with late model Q jet problem... I picked up a "new" Holley rebuilt quadrajet from a board member and its not really what I was expecting. I was going to use it on my new motor but I don't know if I can or not. I'm not too well versed in late model Qjets but this appears to be a computer controlled carb. does anyone have any idea what the electrical connections are on this thing? Are they mixture controls or will it function without them being connected. I think one of the hookups is a throttle positioning sensor but I have no idea what the other one is. If they are just feedback circuits to the computer to control spark advance I assume I can use the carb as is. If they are mixture contol selenoids then I am screwed. Anyone have a guess? The numbers on the carb are 17082253 1562 DTK Attached Images __________________ No truck :-(

07-15-2002, 11:21 PM	#2
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	Heres the front Attached Images __________________ No truck :-(

07-15-2002, 11:59 PM	#4
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,976	It looks like the standard connector for the computer-controlled Q-jet. It has electronic metering. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

07-16-2002, 12:21 AM	#5
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	So I'm screwed. Great! __________________ No truck :-(

07-16-2002, 12:35 AM	#7
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	Deffinetly give it back! Those electronic feedback carbs suck even when they are on the proper vehicle. __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

07-16-2002, 12:23 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Take it back?

07-16-2002, 12:45 AM	#8
slam33 Registered User Join Date: Aug 2001 Location: Long Beach, Ca Posts: 1,432	Put an Edel on it and be done with it. Q-jets were the worst carb ever built. When I had my parts house, I had a carb rebuilder. He built carbs all day long, we had more Q-jet parts than any other carb. They were a pain to rebuild and a pain to get running right. __________________ 71 LWB 350/350still working on it but it's going tp be sweet. www.geocities.com/stevemau/slam33page.html " TARGET=_blank>http://www.geocities.com/stevemau/slam33page.html?1004806705410 </A>

07-16-2002, 01:03 AM	#9
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	Iv'e had a dozen or more carters over the years and theyre good carbs but I'm building this more for mileage and the edelbrock ( carter ) is not as good as a spread bore quad in good tune for mileage. Obviosly this one isnt what I am looking for but Quads arent that hard to tune. Theyre not evil but theyre really not that difficult to work on either. __________________ No truck :-(

07-16-2002, 01:07 AM	#10
O'l Buck Recovering Truck Driver Join Date: Mar 2002 Location: Orleans, NE USA Posts: 1,883	it will run, but those carbs are POS....I had a 83 cutlass for a while that had the computer controlled carb and dizzy, sh!tcanned the dizzy, put in a regular HEI and disconnected the wires from the carb, the electronics control the fuel suply to the primary jets, but when they have no power to them, the fuel is wide open. It will run, but you won't be happy with the performance of it.....my advise is to get rid of the carb, and go with a correct QJ, or edelbrock. __________________ 67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska

07-16-2002, 10:47 AM	#11
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	Depends on want you want,and how much you like to work on carbs. The only thing different about that carb is it had a computer controlled enrichment circut to make up for the fact the to pass emissions they ran them so lean they would barley run. You can make it work on a "regular" motor and it even has one advantage. First the air valve has a stop that must be ground off to get full airflow. From the looks of that picture it might have allready been done. Second that carb has an adustment on the metering rods for adjustment that is pretty cool. I would stick it on your motor and see how it runs. From the looks of the picture it has been modified, I don't think it is legal for Holley to sell a computer controlled carb in that condition will all the anti-tamper plugs removed. Check out this link it might help. http://duzy.8m.com/monte/ccquadrajet.htm __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS



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