I have an idling issue with my 1992 Accord
16v manual transmission 2.0l carburettor engine 110hp w/manual choke

Idling
The engine dies quickly at idle when both engine and weather is cold, at sub-zero temperatures the idle will chase approx. from 0 to 1100rpm back and forth. There will be a lot of smoke at freezing temperatures.

Normal idle a couple of years ago:
6800rpm when warm, and up to 2300rpm when cold, where it gradually regulates itself down

After 3-5 minutes of driving in the cold (as the car is starting to warm up) the idle speed up to typically 3-3.500 rpm and after another 5 mins when fully warm) it calms down to normal idle speed of approx. 6800 with only a bit poor idle. Right after the revs have calmed down and the car has warmed up, there is a risk that it may die at idle, this does not happen while driving. It has a rough start afterwards as it doesn't seem to get enough fuel, it usually starts while I hold the throttle/choke all the way down for a few seconds

While driving
The engine hesitates at low throttle while driving when it's cold outside, especially with a cold engine, noticeably better with a warm engine

Starting
The car is easy to start, but after this problem accured it requires more choke/throttle to do so

What has already been replaced without any improvement:

Replaced air filter
New spark plugs
Cleaned distributor cap
New fuel filter
Carburetor spray + cleaned most of the carburettor with compressed air + fuel system cleaner mixed in the tank
Replaced battery
Verified that the primary slow cutoff solenoid valve works, cleaned transition so that grounding works + blew inside the hole here
Functionally tested the air intake valve
Cleaned the PVC valve (the one on top of the engine block) + changed the hose to this one that were leaking
Replaced thermostat
Changed several vacuum hoses that were leaking
Replaced Fuel Cutoff relay (controls the fuel pump)

Any thoughts are appreciated

 

I didn't even know that there was a carb made for Honda's in1992. If your car has flip up headlights, than it is a 1989 or older Accord, though Accura used the same motor in 1990.

I have seen this issue a few times in the 1980's Honda's.

*I had checked for vacuum leaks, broken hoses, automatic choke issues, many have water lines to them to help them warm up as well as there can be an idle sensor (I think this has one wire going to it).

I mostly owned the fuel injected versions but I did have one carb and it had major idle issues. This would have been the lX/DX model and the LXI had the fuel injection.
I tried everything externally to repair the carb, the only way I was ever able to fix the carb was to tear it down and put a full carb kit in it.

I used Napa parts cleaner, you can get by with 1 gallon if you put it into a different container to soak the carburetor for 30 min (was acid off with dawn/warm water and compressed air) as the carb won't fit into the 1 gallon paint can that the acid comes in. You can use the cleaner in a plastic container, but the acid eats rubber. I used the 5 gallon dip tank with basket so that i could soak the whole carb at one time. The spray carb/choke cleaner makes the outside look nice, but in my opinion is pretty worthless.

Some people say it is a difficult carb to rebuild. While it is more difficult to remove on a Honda than on a V8, it is not any more difficult to rebuild than any other carburetor I have worked on.
I have seen some people say that they just replaced the carb with a factory original carb and that fixed the issue. I don't know about aftermarket carbs.

So no, I don't know what was actually wrong with the carb, but i did get mine fixed.

https://www.napaonline.com/en/p/MAC6402

 

Thank you for the response, the car does indeed have a carburator like the 80’s models, but registed in 92, which made the troubleshooting more difficult for me.. The car does not have flip up headlights like they did in the 80’s, so it is indeed a 90’s model. Maybe its different because it was sold in europe.

I belive I have dealt with most of the bad vaccum hoses, when I spray them with startgas there is not an impact on the idle, which should be a good sign.

There might be a choke issue like you say, I was hoping anyone knew about a weakness in these model causing this problem because I have no clue.
Maybe a bad thermostat attached to the carb that I have not located yet? The carb might also be plugged like you say, maybe I can open it up and put it in diesel for example, I have no idea where to get new gaskets, so I dont want to ruin them..

I checked the primary slow cutoff solenoid valve on the back of the carb, I thought this worked like an idle sensor? It has a wire going into it like you said. Have not heard of any other sensors that may be relaited.