Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

1976 Cadillac Quadrajet idle problem

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von:
The electric choke is just a resistance wire that gets hot and operates a bi-metal spring like a hot air choke has. The resistance wire takes the place of hot air off an exhaust manifold. If the resistance wire gets hot it should work OK with the proper choke adjustment. You can usually feel the choke housing and it will be warm after a couple minutes if it's working. Make sure it has a path to ground through the carb body. That means no gasket in the choke housing.

jbmoffo:
I was wondering how STRONG the spray/stream of gas should be when I move the accelerator pump as it squirts into the carb?
Does anyone have a link to a video/photo I might see?  I guess the best way is to check after the car has been running, but then have the engine turned off so I can see how strong a stream I have?

jbmoffo:
I found the video on Youtube.  Although it is not a Quadrajet, I was wondering, (and I probably know the answer already ::)) if the Quadrajet's accelerator pump should be spitting the same quantity of fuel that this one does. 
Just trying to confirm that mine hesitation is def related to the pump.

https://www.youtube.com/watch?v=YFOeq20dN9w

429bbf:
i think your going to find that when you push your acc pump it moves a great distance before any fuel comes out. it needs to move fuel immediately when it is moved if not the plunger seal is bad or the check ball is not seated. fwiw

jbmoffo:
 ;)  That is exactly the problem.  It does need to move somewhat in order to get the spray.  I was in the engine the other day basically climbed up over the fender well to peer inside the carb while the car was warm.  As I moved the throttle, you can see a stream being sucked into the throats, but due to the vacuum it was not as easy to see how strong they were....although, in retrospect, they did not appear that "potent".  Someone suggested trying it with the engine off after warm up to get a good "picture" of what is happening....
At this point, it is pretty obvious however.
I am going to replace the pump and when I do, I will take a look at the check ball and see what it's doing. 
Thanks for all your help.  Unfortunately, it is a bit cold in NJ right now (unusual)...and I did have plans to take it apart around Thanksgiving....so I just may wait until the spring seeing the car is garaged all winter and I do not drive it. :'(

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