74` chevy 6 cyl perfect idle with choke closed, and no vacum leaks .what should i do? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-25-2004, 04:12 PM
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Red face 74` chevy 6 cyl perfect idle with choke closed, and no vacum leaks .what should i do?

my 250 6cyl, runs fione when the choke is shut closed about 3/4 of the way, when i open it all the way it wants to off idle and get choppy..sptts out the tailpipe, when choke is open misfires,when choke is open rmp respnse if perfect, when steady rpm id set., krackle and pops out the tailpipe. when choke is closed ****ty response and no krackle or pop. IT NEEDs TO GET THROWED AWAY! i have checked and rechecked everything on the carb, even though i have just rebuilt it, it`s a rochester monojet off of a nova 6 cyl., if anyone knows what vacuum lines go where please let me know .. and/ or please give me some advice on what i can do to fix this problem.

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Old 07-25-2004, 04:53 PM
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with the choke closed your killing the air to the engine, what happens with the choke closed is your getting the air just about right with the ratio of fuel, which tells you quickly the idle circuits are almost stopped up or the mixture is severly out of adjustment. if adjusting it makes no changes you`ll need to strip the carb and have it dipped likely to get them clear. that or clean it the best you can with carb cleaner and get into every passage, then go in behind it with high pressure compressed air, then hit them again with carb cleaner.
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Old 07-25-2004, 05:06 PM
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How did it run before you rebuilt the carb?
Was it pretty dirty inside when you first took it apart?

You could put that crap in the gas that cleans out your fuel line and the insides of your carb, but if the ports are 100% clogged it won't work. That crap has to flow through the ports in order to clean them.

I don't know if this is a good idea or not, but in my truck I put two 16 gallon treatments in about 5 gallons of gas, then drove around till the tank was completely empty. After that, I treated the other tank, then changed the fuel filter. Didn't hurt anything, but I don't believe any of the ports in my carb were clogged either.
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Old 07-25-2004, 10:19 PM
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see the thing is, i have cleaned the carburetor completely, every passage is cleared, i sprayed through them wiht carburetor cleaner and every passageway squirts, but does that mean wiht the hgih pressure is WILL spray, but while the engine is running it doesn`t have enough vaccum for the gas to be PULLED THROUGH?, should i dissasemble the carberetor adn spray every passage wiht cleaner and shoot through wiht compressed air tomorrow. i will get back to you. i am going to try and find some cans of DIp to clean the carb completely. do u know of any convenient auto parts dealers that sell a kind of dip u r tlaking about?
thank you very much for adding some insight to my forum.. scott
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