Re: new Carb options for J-20 with an AMC 401 ??
This is actually my dads truck, but me and him basically share it and he hasn't the time to do a lot of work on it, so its up to me I guess.
The symptoms I'm seeing are as follows:
Starting the engine can be a bit hard, as it will sometimes stall out. to keep engine going I need to hold the throttle down for a while until it warms up a bit.
Once warmed up, it seems to run ok for a bit, but after the engine is at or above normal operating temps, it will sputter and die at low RPM when under load. Seems to idle properly in neutral, but if you try to put it in gear it will sputter and die. To start off from a red light I have to rev the engine a little and drop into gear to keep from stalling. While driving, if I try to accelerate quickly up a hill, or even on flat ground, the engine will stutter and loose power until I reduce throttle. When reversing the truck, the problem is magnified substantially. I have to hold the RPM quite high while reversing to keep from stalling out.
I've tried some troubleshooting, although I'm not a mechanic myself. I've taken it to the shop to have the timing and carb adjusted, and this seemed help a little (and I mean barely noticeable).
I was planning on replacing the carburetor as it is in piss poor shape. I've also read a lot and it's been suggested that a fuel pump could cause similar problems, but this doesn't explain why the problem gets worse as the engine gets hotter. I've also replaced components in the EGR system but they just keep failing. Which is one of the reasons I wanted to scrap it and go to a new carb with an electric choke.