OK so i rebuilt my carb' (2bl rochester 2gv) and put it on the engine (71' 350). I am having trouble to get it to idle correctly. It is constantly loping and when i advanced the timing a little this helped some with the loping but not my main problem. On the high side of the lope i get unburned raw fuel gushing out of the top of my carb. It gushes in a pulsing mannor with the lope of the engine. Do not have money for a new carb so any help would be appreciated. PLEASE HELP!!!!!!!!
Possible that the float and fuel valve are occasionally binding. Did you install the retainer on the fuel valve that affixs it to the float? If so did you ascertain that the float would move from full open to full closed? Often, there is a pair of small holes in the float arm that appear to be where the retainer would be affixed, but this is not the case, and will cause the fuel valve to bind in the seat. If using the retainer, always slide it over the float arm from either front or back (different floats different spots), but never in one of the holes. After checking the position of the retainer, gently move the float from full open to full closed, and make absolutely sure there is no bind. Jon.
Most times this happens on a fresh rebuild Take a wooden hammer handle and tap on the bowl and inlet area. Also as you remount the carb, give the carb a shake straight up and down just in case the needle and float are bound. 2G I have had in the past would even do this if you got off in the ditch at an angle (snow, yuck) and would require getting level again and doing the hammer handle trick.
To see if the carb was re-assembled correctly, check out my thread on rebuilding a Rochester 2GV: http://www.v8buick.com/showthread.php?t=86177 A loping idle may not be a carb problem (how was the car running before you did this work? Is it all stock?). Maybe you have a stuck lifter? Is the cam stock? A vacuum leak (hose missing or broken)? How about running a compression test? Do all 8 spark plugs fire? How do they look (color, condition)? Give us a little history of the work up to this point - we should be able to nail this problem down.
thanks guys Well as it all turns out it was just the float being improperly adjusted. It was allowing too much fuel into the bowl. So after many many tries of bending the float arm i finally hit the nail on the head. As for the loping i just wound up resetting my points and its pretty dang good now. It does run a tad on the rich side but nowhere near what it was so as for just getting it running and this being my first rebuild/resto I'd have to say its good enough for me. But anyway THANKS guys and kudos to the sight for all the inclusive help you have all provided. :TU:
