A little background on Ahstray's car: A year ago June, the car ran fine after installing a chain and gear, back when the fuel pump eccentric was loose, not allowing the pump to pump gas.
Later, it developed a hesitation. The first thing we checked was the accelerator pump--of course after breaking the fuel line and verifying that the pump pumped enough volume, plus a full bowl--and it didn't even sputter.
Installed a new acc/pump, test drove the car, and it still hesitated although Ashtray said that the car accelerated stronger than ever before.
We replaced the boarderline points/condensor and set the dewll a hair under 30'. We set the dwell a nanohair under 30' because we were using a Mickey Mouse hex wrench. We also replaced the cap and rotor, moreso because Ash had a new one, than because it was bad.
(IF ANYONE HAS A LINK FOR A POINTS SETTING TOOL, A HEX KEY ON A FLEX SHAFT, PLEASE POST. I used to have one until a whistelbritches punk kid stole it a few years back.)
The mechanical advance was sticking, so we weasel piSSed it up with wd-40. We put it back together, and it still had a hesitation, but Ashtray said that--hesitation notwithstanding--the car was running even stronger. At least we're making some headway and not going backwards.
On the next and latest bout, I rechecked the advance, wondering whether or not it was still sticking, but the advance was freed up and working fine.
Of course there can be other issues causing the hesitation, but it's acting like an accelerator pump issue. Light throttle is okay, but a slight rap or more on the gas, and it hesitates, even stalling.
I rechecked the acc/pump shot, and as I had origionally wondered when we put the cab back together, the shot wasn't/isn't what I consider a sufficient shot of gas. We verified the pump volume by crnking/disconnecting the gas line. Ran the engine to ensure a full bowl, then checked the acc/pump shot.
The problem with this diganosis is a case of wheter or not my opinion is accurate. (It's a rod 2bbl.) Yes, the pump provides a shot, but I don't know what is considered a healty shot from a 2bbl. If it were a quadrajet, the pump shot is unsatisfactory, but it's not a quad, so it's a different ballgame, and the acc/pump shot just may be VOTS (vehicle operating to specifications).
With a quadrajet, when you crack a quad throttle, in addition to a hard stream of gas, and you can feel the pump's resitance. If you continue to pump the throttle to the point where the pump cannot shoot, you can feel the lack of resistance as the pump goes dry.
With the 2bbl, there is a shot of gas; the question whether or not it's sufficient. Another thing that I'm unfamiliar with is, unilike the quad, you cannot feel resistance when you crack the throttle, meaning that you cannot feel a difference in the resistance as the pump goes dry.
Of course there are other issues that could cause hesitation, but we're pi$$!ng in the wind if we cannot determine whether or not it's a sufficient acc/pump shot.
Does a 2bbl have a similar shot as a quad? I would think that a 2bbl would have a similar shot as a quad, perhaps even more because the larger venturies would require a larger shot.
