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 > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-05-2019, 08:59 AM   #1
Minkota
Registered User
 
Join Date: Jun 2016
Location: West Palm Beach, Florida
Posts: 58
Engine Dies when looking for Vacuum Leak

I was trying to adjust the Carter AFB Competition Series Carb and Timing last night and was having a little trouble getting it dialed in so I sprayed some carb cleaner around the carb to look for any vacuum leaks and whenever I sprayed it near the Electric Choke the engine would start to stumble and almost die.

Anyone run into this before?
__________________
Ever ask yourself why there is never enough Time and Money to do things right the first time, but always enough Time and Money the second time?
Minkota is offline   Reply With Quote
Old 06-05-2019, 09:23 AM   #2
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 10,567
Re: Engine Dies when looking for Vacuum Leak

Yup!
I found the leak too!
geezer#99 is offline   Reply With Quote
Old 06-05-2019, 09:52 AM   #3
Minkota
Registered User
 
Join Date: Jun 2016
Location: West Palm Beach, Florida
Posts: 58
Re: Engine Dies when looking for Vacuum Leak

Shouldn't the engine rev up when it is sprayed; it bogs and almost dies when I spray it...

The only thing I can think might be happening is the Carb Cleaner is coming out cold and making the Choke think the engine is colder than it is and applying the Choke.
__________________
Ever ask yourself why there is never enough Time and Money to do things right the first time, but always enough Time and Money the second time?
Minkota is offline   Reply With Quote
Old 06-05-2019, 10:27 AM   #4
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 10,567
Re: Engine Dies when looking for Vacuum Leak

Spray into the Venturi and see what happens.
geezer#99 is offline   Reply With Quote
Old 06-06-2019, 09:20 PM   #5
garyd1961
Registered User
 
Join Date: May 2016
Location: Henderson NC
Posts: 654
Re: Engine Dies when looking for Vacuum Leak

Electric chokes don't work that way. They don't care what temp the motor is. You have a leak around the choke somewhere.
garyd1961 is offline   Reply With Quote
Old 06-07-2019, 11:06 AM   #6
68gmsee
Active Member
 
68gmsee's Avatar
 
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,942
Re: Engine Dies when looking for Vacuum Leak

Actually, the bi-metal coil inside the choke is expanded by electrical current heating the metal and expanding it. Spraying the choke with carb cleaner probably won't cool it enough to affect engine to die (as mentioned above) so it's more than likely a vacuum leak somewhere else.

You can double check that by removing the breather cover and actually looking at the choke to see if it closes.
__________________
68 GMC 250/3 speed Saginaw p/b p/s
69 Chevy 350/350 currently in pieces still lookin for a cab
06 Trailblazer
I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...
68gmsee 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 12:56 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com