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Posted by David Sherman [24.32.202.83] on Tuesday, September 15, 2009 at 17:08:59 :
In Reply to: Re: Plug in the intake manifold posted by Galen [208.12.121.254] on Tuesday, September 15, 2009 at 13:53:04 :
I doubt it's that small vacuum line. Whatever your problem is, it's something big and simple and will be obvious when you find it. First thing to check is the throttle plate. Look down in and make sure it closes like it should. Make sure the spring pulls it solidly closed. Something simple went wrong -- the throttle plate fell off the shaft, the lever that works it didn't get its set-screw tightened down so the lever's slipping on the shaft, or the spring that pulls it closed isn't hooked up. It's something of that nature, I think.
If it's a vacuum leak, it's a massive one like the 3/4" open hole I had. My situation was different though. On my chevy the engine would not run at all with the choke open, and with the choke closed it would race uncontrollably. That's because with the choke closed it sucked plenty of air through the hole to dilute the mix, but with the choke open and the throttle closed, the mix was way too lean.
In your situation, racing with the throttle "closed", I don't see how any problem with the carb itself could cause that. Even if some important part was left out when you put the carb back together, and it was pouring gobs of gas into the intake, it seems to me that a closed throttle should control the speed unless you also had a major vacuum leak downstream of it. Assuming the throttle is closing like it should, you'd need both a big air inlet downstream of the throttle AND a carb that was letting way too much gas in.