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 > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-30-2019, 02:05 AM   #1
vitamin_c95
Registered User
 
Join Date: Feb 2019
Location: So Cal, CA
Posts: 78
Priority List

So I am finally getting the ball rolling to my restore/make road worthy truck. I've found some things I want to take care of, but fuzzy on my old school basics. Truck shakes a little on a cold start (unsure of acceptable limits as this is my first carbureated). It will run "fine" after maybe 30 seconds of feathering the gas. Exhaust smells like it's running rich. However, both my mufflers have holes so it's very loud and tough to tell how efficient it's running. Should I fix the mufflers first before checking timing/adjust mixture screws? I did see a broken exhaust stud 2 days ago when I pulled the driver fender liner as I was going to pressure wash the gearbox area to have a clean work area,.
So will this exhaust leaks skew my diagnosis of carb needing adjustment? Tank is low on gas (about an inch visually looking thru tank cap) and almost went to add some but was unsure of the tank level as I noticed gas gauge is not working. I will add a can first then drive to station after I drive the neighborhood so gain my trust of driving it far.
As I've also found my gauge is stuck on 3 clock. I'm more concerned with runability for now, and will tackle gas gauge later ( I've seen plenty of posts on here and still thumbing thru)
vitamin_c95 is offline   Reply With Quote
Old 06-30-2019, 02:22 AM   #2
clay68c10
Senior Member
 
clay68c10's Avatar
 
Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,309
Re: Priority List

You can do timing and idle mix first. The exhaust leaks won't matter. Get some good fuel in there before you do any adjustments.
Compared to new cars, it is going to be stinky no matter how it's running. After you mess with it for a while you will be able to tell what is good stinky VS bad stinky.
__________________
ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17.
http://67-72chevytrucks.com/vboard/s...d.php?t=788602
68 Cadillac Sedan de Ville
93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday...
02 E320
13 Tahoe LTZ
clay68c10 is offline   Reply With Quote
Old 06-30-2019, 09:42 AM   #3
Steeveedee
Senior Member
 
Steeveedee's Avatar
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 4,120
Re: Priority List

It's easy to verify proper choke operation. Take the air cleaner off and start the truck cold. The choke plate should be all the way closed at the start and should pull open some amount once the truck starts and vacuum builds. If the choke doesn't close all the way when cold, that's what may be causing you to have to feather the throttle in the beginning.
__________________
'70 Chevy 3/4T Longhorn CST 400/400/3.54 Custom Camper

"Orange Acres"
Steeveedee is offline   Reply With Quote
Old 06-30-2019, 09:47 AM   #4
vitamin_c95
Registered User
 
Join Date: Feb 2019
Location: So Cal, CA
Posts: 78
Re: Priority List

Thanks for the replies. Think I remember reading to adjust the choke twice a year minimum to the width of a credit card. Does that sound right? It's an edelbrock 1406
__________________
1971 C20 Longhorn 350/350 "Conquistador"
vitamin_c95 is offline   Reply With Quote
Old 07-03-2019, 05:19 PM   #5
68 P.O.S.
Slow Member
 
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,173
Re: Priority List

What carb are you running?
__________________
72 C10 lwb fleetside -stock 350/350 combo
68 P.O.S. is online now   Reply With Quote
Old 07-03-2019, 06:02 PM   #6
68Gold/white
Registered User
 
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 2,064
Re: Priority List

Quote:
Originally Posted by 68 P.O.S. View Post
What carb are you running?
X2 my thoughts also, and whatever it is, the condition??? Has it been worked on...lately??? Does it look like it last ran in the 70's???
68Gold/white is offline   Reply With Quote
Old 07-03-2019, 06:44 PM   #7
vitamin_c95
Registered User
 
Join Date: Feb 2019
Location: So Cal, CA
Posts: 78
Re: Priority List

Edelbrock 1406
__________________
1971 C20 Longhorn 350/350 "Conquistador"
vitamin_c95 is offline   Reply With Quote
Old 07-03-2019, 07:12 PM   #8
vitamin_c95
Registered User
 
Join Date: Feb 2019
Location: So Cal, CA
Posts: 78
Re: Priority List

It's a brand new edelbrock intake and carb, was installed last year, and tanks fuel purged. It's been sitting as the previous owner started having health issues and recently passed. I've added at least 8 gallons of fresh fuel over the past month while I started working on it as I am now about to drive it for the first time in coming days.
__________________
1971 C20 Longhorn 350/350 "Conquistador"
vitamin_c95 is offline   Reply With Quote
Old 07-04-2019, 07:03 PM   #9
68 P.O.S.
Slow Member
 
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,173
Re: Priority List

Edelbrocks are a good carb, they just have to be setup right, or else they flood and percolate fuel. First thing is to open it up and clean it out and check the gaskets and see if you need a rebuild kit. Then set the float travel and install a fuel pressure regulator set to 5.5 psi to stop it from flooding. Then, install Edelbrocks 9266 insulating gasket to stop fuel percolation. After that you should be running and the rest will be fine tuning with jets and step-up springs.
__________________
72 C10 lwb fleetside -stock 350/350 combo
68 P.O.S. is online now   Reply With Quote
Old 07-06-2019, 02:01 PM   #10
Steeveedee
Senior Member
 
Steeveedee's Avatar
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 4,120
Re: Priority List

Quote:
Originally Posted by vitamin_c95 View Post
Thanks for the replies. Think I remember reading to adjust the choke twice a year minimum to the width of a credit card. Does that sound right? It's an edelbrock 1406
I would try moving the choke thermostat about two increments to rich, for starters. That's towards cold weather, which it isn't, right now. But if it won't stay running at cold idle now, it's a first step to try.
__________________
'70 Chevy 3/4T Longhorn CST 400/400/3.54 Custom Camper

"Orange Acres"
Steeveedee is offline   Reply With Quote
Old 07-06-2019, 05:27 PM   #11
vitamin_c95
Registered User
 
Join Date: Feb 2019
Location: So Cal, CA
Posts: 78
Re: Priority List

Thank you for the replies. I just got back from my drive to TX, so hopefully I can mess with it today or tomorrow
__________________
1971 C20 Longhorn 350/350 "Conquistador"
vitamin_c95 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 03:16 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com