I am currently driving a 1986 honda accord 2bl carburated with nearly 300k on the odometer. The car has had its problems like going through fuel pumps yearly but a few weeks ago after a ~90 mile round trip I noticed the car did not feel like it was doing what it was supposed to do. And soon after it began having a major problem.
The car surges or bolts when the accelerator is pushed or if its warmer and the pedal is pushed the RPMs will just start to drop, until I let off or it dies. Releasing the pedal lets it idle fine. Car starts fine, idles good, ran like a top otherwise.
If i pump the gas it will surge up to speed, and when I get to about 4grand on the RPMs it will haul ass with no problems at all no surging etc, but then when i shift it will bog down and the RPMs will drop, unless i pump the gas, and then get it back to about 4 grand.
It seems like when i am turning whether left but especially right, the problem improves for a short time until i shift, but this does not always hold true.
After driving it this way at high way speeds and teh car is at full operating temp (not going into fifth because it will bog down too much without excessive pumping) sometimes it will improve and i can drive it normally but if i push the pedal just to much and shift it without slowly letting the clutch out it will start the problem again, this especially works well when i come to a stop in traffic or a stop light and sit for a minute, this usually heats up the temp a little and allows me to drive it normally until i either give it too much gas or release the clutch too quickly.
I have changed both fuel filters.
Recently I have been playing with the choke, it seems like the choke heater coil works fine (but only opens the choke), i removed it and its clean, the linkage as far as i could see is free to move, i lubricated it and cleaned it etc.
One thing i noticed and as mentioned in my chiltons manual it states that depressing the accelerator completely and slowly releasing it should set the choke plate (the butterfly on top) when below 82 degrees it should close completely, when above to about an 1/8", but the accelerator has absolutely no effect at all on the choke plate.
I am thinking it is the linkage but i cant see under the choke if it is connected on the bottom someplace else. (like to the throttle cable plate or whatever, or if there is a spring missing etc)
The vacumn opener seems to work good, no blockage in the ports, so does the fast idle unloader.
There is no vacumn leaks I see or hear.
The fuel pump was recently replaced but i wouldnt rule it out (its a MASTER from autozone), but everything i see points to the choke because if i choke it by pushing my finger on the butterfly (holding it semi-closed) while giving it gas on the throttle cable it works like it is supposed to, no bogging down.
There is definetely a problem with the choke, im guessing, but I havent checked into fuel volume, and that pre-heater hose that connects to the exhaust and the air intake I removed seeing as it was not in the best shape anyway. (if i remember correctly this was after the fact or problem occurred, besides its the summer, so carburetor icing shouldnt be a problem) and I have no idea where the hell or what a thermovalve looks like.
I have used some spray cleaner on the surface of the carb and linkages, I have even put a can of b-12 in the gas tank. But nothing I do seems to work. If im not mistaken my father had this problem before with it jerking heavily, much worse than it is now. I don’t suppose this could be fuel pulsation by the baffle? Maybe the float bowl, I havent checked the float level?
Something also to add is that I keep thinking about the choke, and the way im thinking is that it has nothing to do with it. Just like a weed eater when its warmed up, there is no use for the choke, only when its cold, and im assuming the concept is the same on my car and is the reason for the choke coil only opening the choke.
So the problem lies in something else, as if its not getting enough gas.
I have been reading the forums here, I havent read everything or searched my problem but this is just to get my foot in the door.
I have not taken off the top hat and sprayed the bowl and ports clean, and have not checked to see if the venturi’s are loose.
I’m sure there are various other things I could do to find out what the problem is but that’s the extent I know and would greatly appreciate any insightful help, i have to drive this car daily (college, work, errands) so i'm kind of begging for help.