The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > Welcome and Discussion > General Discussion

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-14-2016, 03:52 PM   #1
johnwaynejeep
Registered User
 
Join Date: Jul 2014
Location: Pacific Grove, CA
Posts: 105
Quadrajet Sticky post-is this an option

All,

I recently rebuilt the quadrajet in my 85 K20. I had some questions and I was surprised I didn't see a tech section with articles or write ups concerning common questions or common tasks that people do with these trucks.

Is it possible to start a tech section? this section could be populated with sticky threads that address common tasks and problems. If this already exists and I'm just not seeing it I apologize.

As an example of a tech thread, I've found that the stock high speed idle on the quadrajet sticks very easily. I was planning on drilling some holes in the tabs and attaching a return spring to the high speed idle. The accelerator pump is also a little sticky, I was planning on replacing the spring in the base of the pump with a higher tension spring and sanding down the pump shaft to open up the clearance. Anyone who has tuning suggestions for the typical at home mechanic would be a fantastic addition.

I have no problem writing up a tech article on this. Keep in mind this is the first time I've done this and I'm likely to get some things wrong, it would help if someone is willing to look over the article once completed and make sure I'm not posting bad information

Thanks
Robert
__________________
Robert
1975 C10 - Huckleberry
2007 Jeep JK - John Wayne Jeep
Smittybilt front/rear bumper, 10K winch
Pacific Grove, CA
johnwaynejeep is offline   Reply With Quote
Old 06-14-2016, 10:29 PM   #2
special-K
Special Order
 
special-K's Avatar
 
Join Date: Nov 2004
Location: West Falls, MD
Posts: 74,871
Re: Quadrajet Sticky post-is this an option

Good idea. they are great carbs, OEM, and it's getting harder to find mechanics that know about carbs. Helps to know a little when you go for parts or even a replacement.

For sticky posts just spray som carb cleaner on and work it. Usually frees it up
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC

'67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi..........'The 67' (project)
'72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok...'The 72' (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586

Last edited by special-K; 07-23-2017 at 07:23 AM.
special-K is offline   Reply With Quote
Old 06-14-2016, 10:54 PM   #3
LockDoc
The Original Thread Killer

 
LockDoc's Avatar
 
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 21,223
Re: Quadrajet Sticky post-is this an option

-
If you scroll down to the bottom of this page you will see a "Forum Jump" box. Click on the little arrow on the right side of the box and you will see a drop down list. Scroll down the list until you see "FAQ Truck Tech" and click on it. That forum contains most of the tech articles for the board......

LockDoc
__________________
Leon

Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles
LockDoc is offline   Reply With Quote
Old 06-15-2016, 06:55 AM   #4
68C15
blood type; Retumbo
 
68C15's Avatar
 
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,266
Re: Quadrajet Sticky post-is this an option

in the meat time, a can of carb cleaner will make your Q-jet much happier
__________________
Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card
68C15 is offline   Reply With Quote
Old 06-15-2016, 07:43 AM   #5
ERASER5
Registered User
 
ERASER5's Avatar
 
Join Date: Jun 2006
Location: Indiana
Posts: 4,861
Re: Quadrajet Sticky post-is this an option

Quote:
Originally Posted by 68C15 View Post
in the meat time, a can of carb cleaner will make your Q-jet much happier
Auto correct. I'm tired of your shirt.
__________________
'70 GMC C1500 LWB
Power disc brakes. WooHoo!
Posi 6 Lug Dana 60
ERASER5 is offline   Reply With Quote
Old 06-15-2016, 11:40 AM   #6
68C15
blood type; Retumbo
 
68C15's Avatar
 
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,266
Re: Quadrajet Sticky post-is this an option

Quote:
Originally Posted by ERASER5 View Post
Auto correct. I'm tired of your shirt.
If you're tired of my shirt then maybe you should give it back


What I was getting at earlier is a carb can have varnish build up on the linkage if it's not driven daily. A can of carb clean sprayed all around out side can do wonders
__________________
Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card
68C15 is offline   Reply With Quote
Old 06-15-2016, 11:09 PM   #7
special-K
Special Order
 
special-K's Avatar
 
Join Date: Nov 2004
Location: West Falls, MD
Posts: 74,871
Re: Quadrajet Sticky post-is this an option

Quote:
Originally Posted by 68C15 View Post
What I was getting at earlier is a carb can have varnish build up on the linkage if it's not driven daily. A can of carb clean sprayed all around out side can do wonders
Ok, I got your meaning the first time, but noot sure about this time. I went outside and sprayed carb cleaner all around and it had no effect on my carb. Am I missing something?? I did see some bees drop out of the sky
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC

'67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi..........'The 67' (project)
'72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok...'The 72' (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586
special-K is offline   Reply With Quote
Old 06-16-2016, 07:00 AM   #8
68C15
blood type; Retumbo
 
68C15's Avatar
 
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,266
Re: Quadrajet Sticky post-is this an option

Quote:
Originally Posted by special-K View Post
Ok, I got your meaning the first time, but noot sure about this time. I went outside and sprayed carb cleaner all around and it had no effect on my carb. Am I missing something?? I did see some bees drop out of the sky
try pointing the nozzle down towards the carb and not the sky.
__________________
Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card
68C15 is offline   Reply With Quote
Old 06-16-2016, 07:45 AM   #9
special-K
Special Order
 
special-K's Avatar
 
Join Date: Nov 2004
Location: West Falls, MD
Posts: 74,871
Re: Quadrajet Sticky post-is this an option

Ohhhhhh................ I feel so silly. That explains why everyone around was rubbing their eyes and went home. I thought it was something I said that upset them
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC

'67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi..........'The 67' (project)
'72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok...'The 72' (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586
special-K is offline   Reply With Quote
Old 06-16-2016, 08:16 AM   #10
ERASER5
Registered User
 
ERASER5's Avatar
 
Join Date: Jun 2006
Location: Indiana
Posts: 4,861
Re: Quadrajet Sticky post-is this an option

Quote:
Originally Posted by 68C15 View Post
If you're tired of my shirt then maybe you should give it back

I can't. It has meat on it now.
__________________
'70 GMC C1500 LWB
Power disc brakes. WooHoo!
Posi 6 Lug Dana 60
ERASER5 is offline   Reply With Quote
Old 07-20-2017, 12:43 AM   #11
johnwaynejeep
Registered User
 
Join Date: Jul 2014
Location: Pacific Grove, CA
Posts: 105
Re: Quadrajet Sticky post-is this an option

All, I wanted to post an update on this thread.

I did attach a return spring to the Qjet high speed idle between the idle paddle and the lower cross bar. It worked like a champ and the spring was strong enough that it would pull the high speed idle down as the choke spring expanded allowing the truck to idle down on it's own.

I initially adjusted the mixture screws using rpm drop and high vacuum reading. I got a little dieseling from time to time so I leaned out the mix and all was good.

Thanks for reading and for the tips.
Robert
__________________
Robert
1975 C10 - Huckleberry
2007 Jeep JK - John Wayne Jeep
Smittybilt front/rear bumper, 10K winch
Pacific Grove, CA
johnwaynejeep is offline   Reply With Quote
Old 07-23-2017, 06:41 AM   #12
68C15
blood type; Retumbo
 
68C15's Avatar
 
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,266
Re: Quadrajet Sticky post-is this an option

and I got a new shirt, without meat on it. LOL
__________________
Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card
68C15 is offline   Reply With Quote
Old 07-23-2017, 11:38 AM   #13
Coley
Registered User
 
Coley's Avatar
 
Join Date: Oct 2011
Location: Victoria, B.C
Posts: 3,794
Re: Quadrajet Sticky post-is this an option

The quadrajet is a great carb but it needs a few things as it gets along in life.
The most useful thing you can ever do to a quadrajet to get your truck running better is remove it from the engine, then thoroughly clean it with carb cleaner and compressed air.
I mean every orifice and chamber, surface, linkage, etc.....clean that thing!
I recommend carefully removing the air horn (the top piece) and thoroughly cleaning out the float chamber, remove the (2) idle/mixture screws, etc.
Then use compressed air through all the ports, etc.
If you are careful you don't actually have to replace anything..and you will probably get your carb/truck running 25% (or more) better right out of the gate.
I recommend to splurge for a new base/insulator gasket to make sure you limit your vacuum leaks.

All good
Coley
__________________
....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL
1966 Chevy 1/2 ton (Florida- Red/white)
1972 Chevy 1/2 ton (California- Blue/white)
2005 Chevy Silverado HD2500/Duramax
2000 Dodge Ram 1500
Coley is offline   Reply With Quote
Old 07-24-2017, 05:34 PM   #14
68Gold/white
Registered User
 
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 2,604
Re: Quadrajet Sticky post-is this an option

maybe make a carb specific area. Make sub area's for Q-Jet, Holley 2G's, AFB and such.

Too many folks here that need carb help.
68Gold/white is offline   Reply With Quote
Old 07-24-2017, 07:59 PM   #15
Boog
laying low
 
Boog's Avatar
 
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 9,926
Re: Quadrajet Sticky post-is this an option

I'm an old qjet guy so I'm all in for a sticky about em but so many guys now days are putting in fuel injected engines and our dear old carbs are being tossed to the curbs like yesterday's news it's a little late for the sticky. There are plenty of reasons to go fi but I just like the old 4 barrel howl of the qjet in my old truck.
I choose to keep my 69 carb'd and no computer stuff. Who knows when some day I might convert it over to fi but at this time I have no plans to.
__________________
Boog
69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver
primer is finer
2 GMCs and 1 Tahoe
All GM..'nuff said,
Member of Jr Nation 88

I stand for the flag and kneel at the cross
Boog is offline   Reply With Quote
Old 07-24-2017, 09:21 PM   #16
johnwaynejeep
Registered User
 
Join Date: Jul 2014
Location: Pacific Grove, CA
Posts: 105
Re: Quadrajet Sticky post-is this an option

Boog,

There's always room for a carb. I'm looking at EFI myself, but my carb is easy to adjust and a lot cheaper to buy build and install.

I think there will always be room for carbs, at least until a bolt on EFI kit can be bought for under $150.
__________________
Robert
1975 C10 - Huckleberry
2007 Jeep JK - John Wayne Jeep
Smittybilt front/rear bumper, 10K winch
Pacific Grove, CA
johnwaynejeep is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:39 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Copyright 1997-2020 67-72chevytrucks.com