I am having issues with my carb on my 1984 pickup (22R of course). The problem is loss of power when accelerating. I just changed out the distributor because I wasn't able to achieve proper timing. Now that it is changed, timing is perfect. The truck idles great.
Now when accelerating very slowly the rpm can ramp up and no loss of power. Accelerating quicker or romping the throttle will cause the loss of power. The engine seams like it is choking. You can hear the air rushing past a restriction.

When the throttle starts to open the lower butterfly valve (drivers side) mechanically the engine will roar back to life. That is if it doesn't die at the restricted part.

Questions:
Is the lower butterfly valve supposed to open sooner than when it is contacted by the throttle linkage at the spring?
Is there a problem with the lower butterfly valve?
Is there a problem with the choke?
What is the problem?


I will post a video soon.

 

Click the pic to get to the video

 

Check the accererator pump circuit. Simple test- look down the carb with the engine off and fully open the throttle you should see a squirt of gasoline in the throat of the carb everytime you snap the throttle full open. That would be my best guess.

 

yep it squirts gas

 

help!

 

hey guy yall seem to know what yall are doing i need some help. i have a stok 85 22r xtra cab that im tring to get running right. the carb wont stop fluding and it will spit out black smoke out the tall pipe. it seems that every time i go to start it i have to hold the gas down. i dont know what to do.....
the guy that had it before the butter fly wired open

 

Trying to steal my thread for you problem, are you?!
I still need my carb problem to be answered

 

We share threads wherever possible.

To answer your question... Hold on let me think of some ideas....

Ok, if you manually hold open the butterfly closest to the engine, it will rev fine, no problem?
And all of your vacuum lines are routed properly? It looks as though the choke isn't pulling off... If that is the valve closest to the engine... I can't remember. I can look at my old engine this weekend though. My carb worked fine for higher rpm, just idled high. I got tired of the carb and put in a 3RZ....