q-jet choke question - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old Sep 10th, 03, 01:11 PM Thread Starter
Join Date: Aug 2003
Posts: 14

i have a stock q-jet that i just rebuilt. It runs fine when warmed up, but on startup the choke is not working. The butterfly is open all the way at idle on startup. could the choke spring be in a bind. The car will not stay running unless you play with the gas for about 2 minutes.
silver67 is offline  
Sponsored Links
post #2 of 2 (permalink) Old Sep 10th, 03, 03:20 PM
Senior Tech
Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277

There should be a thermal spring inside the choke housing. A tang on the spring engages with the lever that operates the choke. Remove the choke housing cover and see that it is properly hooked up. It may be that all you need to do is rotate the housing counter clock-wise a fuzz.

Then again, it may be that way because there is something else wrong with the choke. For starters, the choke is heated by one of two methods. The most common method found on hot-rods is the electric choke. There are two terminals on the choke housing that apply 12Volts and ground when the engine is on. The other method uses the heat riser passage in the intake and a couple of pipes that feed warm air into the choke housing. Yet another setup, the choke spring is mounted on the intake manifold above the heat riser passage and connected to the choke mechanism by a linkage.

The other common choke problem that will cause someone to disable the choke is a bad pull-off servo. There should be a vacuum servo (and a dashpot on some Q-jets) that open the choke plate a bit after the engine starts so it can run. The dash-pot, if one is installed, holds the choke open a bit between cranks to reduce the chances of flooding.

Lastly, check to make sure that the choke mechansisms operate smoothly. There is a counter weight and idle speed cam buried in there that sometimes will bind up if they get bent or improperly installed.


68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
dnult is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome