2g Grief

I'm having a little trouble with the Rochester 2g on my dauntless .
starts good, runs good. Only issue is after coasting downhill with the throttle completely closed, I have a little jerk getting the throttle plates to open again. Acts like the throttle is vacuum stuck. Never sticks when idling, never sticks when engine is off, only when coasting, then getting back on the gas. Any ideas.
Thanks in advance, Tim

 

More like, start mashing on the gas pedal, a little harder, even a little harder, and finally it breaks loose and the jeep lurches.
but again, only after coasting downhill

 

Try adjusting the throttle stop screw to bring the throttle plates above closed position and reduce the spring tension on the return spring.

 

Worn throttle body/shaft allowing the throttle plate to wedge under vacuum?

 

^^ This.
I had the same problem on one of mine years ago. It idled best with the idle screw backed completely off, but it it allowed the butterflies to sorta hyperextend and jam shut. Take it in just enough to notice a difference in idle speed and see if it makes any difference.

 

“It only happens after coasting downhill.” I would suspect something is swinging in and out of the way of the linkage. Inspect everything from the pedal to the carb.

 

The earlier postings have identified your issue with the butterfly jambing/wedging and getting stuck. Normally, the butterfly is held slightly open by the idle screw to let a slight amount of air at idle. In your case, the throttle shaft is problably worn and is letting in the required amount of air for idle, even with the butterfly completely closed. This becomes an issue for you on deceleration down hill because this developing more than normal vacuum, which is wedging the butterfly tight in the venturi.
I don't believe there is any issue with your linkage other than typical wear, which would not be contributing to your problem.
-Donny

 

As a definitive diagnosis, go down the long hill and coast to a stop. Pull the air cleaner off and check out what's going on.

 

Hey, thanks for the ideas guys. I will check on this and let you know

 

My 71 was doing something similar. What it turned out to be was that the lower choke linkage was sticking out too far on the fast idle cam and catching on the throttle mechanism. The linkage has 2 notches, both notches were pushed through fast idle cam. Once I situated the linkage to where the cam was set in between the two notches everything was fine.