Carb replacement/emissions in 1982 720

[webbpd]

I recently was given a 1982 King Cab that somebody needed to get out of their hands. They didn't have the time to put into it and were convinced it was as good as dead.

 

It had the original carb on it, but the choke was gummed up and it had some serious issues idling and running right. I am pretty new to this whole thing, and a friend of mine helped me (or I helped him) replace it with a Weber carb. It's now running much better, but has really intense fumes.

 

My question is, by eliminating a bunch of the vacuum lines, have I compromised the emissions significantly? the fumes have been way more intense since I replaced it, to the point where driving it is really uncomfortable and I get headaches when I drive it too much. Am wondering whether it'd be worth it to clean the original carb, put it back on, and replace all the lines.

 

again, pretty new to all of this, so just wondering what some opinions might be.

 

 

[datzenmike]

Escaping fumes? The hose from the valve cover should connect somewhere between the air filter and the carb throat. This way filtered air is drawn into the engine at idle and light throttle but under heavy throttle when blow by overcomes the PCV system fumes are sucked down into the carb. This is how the PCV system is designed to work, but people can't resist those cute little blue filters.... and then wonder why the vehicle stinks. (not saying this is you) If you have the proper weber air filter on that carb there should be an opening on the bottom for an elbow for the valve cover hose.

 

This is the biggest cause of fumes in the cab.

 

There is also a charcoal canister mounted by the rad with three hoses running to it. It stored fumes that escape from the carb and the gas tank by evaporation. When warmed up a vacuum signal opens the purge valve on the canister and the carb sucks these fumes into the carb and burns them.

 

Another smaller cause of fumes.

 

 

 

 

I would rebuild the stock carb and have it handy. It will run the best because it's made to. The weber is an unknown and may be jetted for the larger Z24 or a smaller L series engine. Unless it's new you may have one that is worn out or has been rebuilt several time with parts mission... generally, someone else's problem. They are easy to rebuild if you know what to look for. The Hitachi is vastly more complex but if you take the time and prepare for a rebuild or just a good cleaning anyone can do it. It would be a good idea to have the adjustment specs for it and a camera to take pictures of parts so you can re assemble it later.

[webbpd]

all helpful information. thank you.

 

another realization is that the original catalytic converter is on it, which after a little research seems to be something that could definitely use replacing. if it is stock, it's probably doing very little at this point, right? is it hard to find a compatible catalytic converter?

[xsdg]

Given that you're not in California, you should have plenty of options.

[datzenmike]

Ifyou don't have emissions teasting or visual checks just leave it or replace with straight section of pipe.

[Charlie69]

Move to Phoenix AZ and put a Weber on it.  My 86 went through emissions testing with flying colors with a Weber 32/36 on it.