I've got an issue with my 37 Hudson 212ci engine not idling. She starts & runs but once warm & choke opens it will not stay running but immediately dies.
Yesterday the choke stuck closed (1/8" open) & when the engine was completely warm it ran with the choke in that position albeit at a high rpm. I flipped the pedal to rev the engine & the choke opened completely, then as the engine came down to an idle it died. I started it again & even would hold the choke completely shut for up to 6 seconds and it still ran without stumbling at all.
I've been assuming it's an intake leak & had both the wiper & electric hand lines blocked off during the running of the engine as I discribed above. I am at my wits end trying to figure this out, please help!
You got a piece of debris in the idle jet or circut
I had a retired mechanic & Hudson guy go thru the carb again looking for something before my original post & he didn't find anything.
I'm thinking I've got air leaking in somewhere, otherwise holding the choke (butterfly at top of carb) closed would kill it.
When the car starts to die spray some carb cleaner at the carb gaskets and intake manifold. If it starts to smooth out, then you found your leak. If not, then start spraying around the vacuum lines.
Suggest not to spray starting fluid or carb cleaner. A spark will set it on fire.
SUGGEST using a butane tank with a flexible hose to find the vacuum leak.
You are looking for an increase in RPM when the gas is sucked into the manifold.
Also, keep your hand on the butane tank valve.
Brian,
I cured a Hudson Jet carburetor (a single barrel carburetor, very similar to yours) with exactly the same problem. The difficulty was that a passage in the idle circuit was completely plugged up. Before taking it apart I had substituted another carburetor, which worked fine, just to eliminate the chance that there was a big air leak somewhere.
Per
Brian,
I should add that the carburetor had been "rebuilt" several years before, but this small plugged passage had not been noticed by the rebuilder.
Per
Gotta be going super lean, and vac leak is a good place to start. Agree to use flammable substance. An unlit propane torch, blowing gas, works well. First plug off ALL vacuum ports to carb and intake including dizzy. See if this changes anything about the way it runs. If not, start it, keep it running, even if have to hold choke mostly closed, then go around intake and carb gaskets. If no change then go after idle fuel issue. Closing the choke increases fuel delivery and lowers air/fuel ratio.
[quote="Richard Dryman" post=17991]Suggest not to spray starting fluid or carb cleaner. A spark will set it on fire.
SUGGEST using a butane tank with a flexible hose to find the vacuum leak.
You are looking for an increase in RPM when the gas is sucked into the manifold.
Also, keep your hand on the butane tank valve.
If you do decide to use butane, be extra careful. If you inhale too much, it could get you an instant HEART ATTACK.
Then use MAPP gas; you buy it at the same place !! Or Propane. Guess it depends on whether you might die or burn your car up--lol.
tks~~
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