Ok here's what i have. 1971 electra 225 455, accel point elem kit, other than that 99% stock 120000 miles. Timing at about 8 deg. Ported vaccum no trans vac thing "I am looking for one." Not that I need it but just want that stock look. New fuel pump. New fuel line from pump to carb. New plugs, wires cap etc. I Just installed a rebuilt carb Rochester correct numbers matching unit. The car runs pretty smooth at idle but has a hesitation off Idle not WOT. I moves but like its choking! At WOT it runs like a rat on fire. I set the mixture with a vaccum gauge and it did not stop. On the old carb "a 71 buick 350 carb not 2 old" the car ran smooth until WOT and would then bog badly, but the old fuel line had a crimp in it due to the old owner F'n with it. So I think that caused a lean bog. The new carb runs alot better than the old one at WOT, but that may be the new line. Now i think that the new/rebuilt carb has been sitting a while. It was in a Holley rebuild box that looks quite old, with instructions and gaskets ETC. I know its alot to take in but I wanted to paint the true picture. Thanks in advance for the help.
Check the tension on the secondary butterfly valves, the spring could be too loose opening up and dumping too much air at low rpm. Pretty easy fix if they open and there is little or no tension. D.
Check the accelerator pump....ESPECIALLY if the carb has been idle for a prolonged period of time. :TU: Tom Mooney
I've seen this from time to time on this model, found the float level is very important and clean run ways to the accl nozzles. Also have seen sealing problems at the top cover and I use the thicker top gasket to fix that problem, AL.
Well sounds like a starting point. I will make those checks in the morning. Could not get to it today had to throw money away, oh I mean had to go Christmas Shopping with my wife today.
On some of those carbs there's a choke pull off type gizmo on the passenger side of the carb that acts as a "damper" for the sec air valves. If that's no good that will certainly cause a bog. It should hold vacuum and not leak down. Also, stumble from a dead stop can be the result of retarded timing or a bad vac advance aside from a bad accelerator pump plunger. I'd check those things first before tinkering with the sec air valve spring. If I'm not mistaken, those should be set to about 1/2 to 3/4 turn from closed, but any looser could cause your problem. :idea2:
:gp: Its very funny you would say timing! Yesterday it occured to me that the timing chain has 120000 on it. I checked the timing and it was at about 8 deg were I set it last time. Then "just for kicks" I advanced it up to about 14. The hesitation was almost 100% gone. I then advanced it to about 20 with no problem. I did put it back to 14, thats were the motor ran the best. Stock on this car is 4 deg. Guess its allmost new chain set time, but not yet the boat now hauls a$$. If the site had not been down I might have beat you to the punch. Thanks everone for the help.
