Hot Start Issue Choke stuck?
Rebuilt carb same problem.
Runsruns well until it starts to get warm hundred 40 degrees or so and then just wants to stall out. I can start it and keep it running by getting on the gas but it won't idle.
I fixed the wire. Same problem. I tried getting it going, using a bottle with a tiny pin hole in the cap to keep it going with gas. Still stalled eventually.
From this, it sounds like the choke and fast idle are opening too soon. As part of the rebuilding, did you set everything to the factory dry (bench) specs?
Then once its warm, did you try adjusting everything to spec the best you could?
What do the spark plugs look like? Anything seriously out of line? If so, theres a clue.
The ballast resistor had a drop of about 1.5 volts compared to the battery.
Which side? If there is resistance in the black alternator feed or the blue ignition wire, any place before it gets to the ballast, that's bad. If its on the other side of the ballast, then that's normal.
Electrical is certainly my weakest skill. I'm trying to run through basic how to off of forum for checking all the ignition parts.
I agree with Dana, not likely ignition, since it starts and runs, and the fact you can keep it running by opening the throttle and giving it some pump shot. If the ECU is failing warm, changing throttle position and fueling wouldn't likely help.
Have you checked base timing yet? Although honestly don't think thats the main issue.
Having said all that ^^^^^^, There are some altered systems we see in the photos. Maybe those all need to be fixed or disponnected and plugged.
for example:
The EGR with braid covered hose to radiator. Even if you keep EGR, usually its not open when the engine is cold, or any time at idle or wide open throttle. So plug its vac source for now.
By the brake's vacuum booster it looks like there are two hoses with nothing attached to them.
'74 may have a spark delay module. I forget the details. OSAC or something.
Look for any temperature controlled switch. Could be in the air cleaner. Could be in the intake manifold's coolant passage. If there is a vacuum source attached to one of these, and the equipment is no longer attached, there will be a vacu leak when the valve opens. Someplace there is/was a diagram of the vacuum hoses for most of this stuff. Mightbe in the owners manual, sometimes in the shop manual. Later vehicles had stickers in the engine compartment. I dont remember when they started doing that.
