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 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 04-05-2014, 07:30 PM   #1
Guerrero707
Registered User
 
Join Date: Nov 2013
Location: HEALDSBURG CA
Posts: 8
77 GMC carb problems

I ve been having some problems with my truck, i haven't moved it in about 2 months but sometimes when i start it, the choke warms up so i give it a little gas and a few seconds later it shuts off and i cant start it back up. also sometimes if i give it gas too fast it shuts off and sometimes its fine it wont shut off no matter how fast you press the accelerator. please someone help i need a solution to whats wrong with it.
Guerrero707 is offline   Reply With Quote
Old 04-05-2014, 08:25 PM   #2
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 13,702
Re: 77 GMC carb problems

Take some pics front and both sides.
geezer#99 is online now   Reply With Quote
Old 04-05-2014, 09:23 PM   #3
MikeB
Senior Member
 
MikeB's Avatar
 
Join Date: Jul 2000
Location: North Texas
Posts: 3,560
Re: 77 GMC carb problems

Does it run OK when it warms up?

Does choke close when the engine is cold, and then gradually open?
__________________
Mike
1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
MikeB is offline   Reply With Quote
Old 04-05-2014, 09:46 PM   #4
Guerrero707
Registered User
 
Join Date: Nov 2013
Location: HEALDSBURG CA
Posts: 8
Re: 77 GMC carb problems

It sometimes runs fine but most of the times i cant even get it out of the garage because it shuts off when i put it in drive or give it gas to fast.
Guerrero707 is offline   Reply With Quote
Old 04-07-2014, 07:33 AM   #5
motornut
78K & 79C Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
Re: 77 GMC carb problems

I had issues with the backflow valve in my 79 carb,it would come out of place and block the flow,kinda like you describe....

http://67-72chevytrucks.com/vboard/s...d.php?t=579621
__________________
John
1978 GMCJimmy4X4-350/203
1979 GMCJimmy4X2-305/350
motornut is offline   Reply With Quote
Reply

Bookmarks


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 05:38 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com