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Vacuum Trouble

rvest1

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Dec 19, 2009
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Location
Davison, MI
I just got this 85 K5 in a trade about 3 weeks ago now. I don't know much about it other than I have spent at least 3 full days on it now and am about to die of frustration.

Alright well I got it running nicely at idle and what not. After driving for like 30 feet it wants to die when I let off of the gas. I do not know the vacuum setup for all of it. The back of the carb (q-jet) has a metal vacuum line that goes to the brake booster. I think the air cleaner hooks in just above that. I have 2 lines that are sucking like crazy that I am not sure where they go but they come out of the intake manifold between the carb and distributor on a little tower. I have a giant black orb that has a line coming from it that has a T splitter with one going into the interior and one going to the aforementionned tower. There is a connection in the front top of the carb that has a little clear line (1" long) and a screw plugging it. There is a line coming from the driver side firewall but I do not know where it goes. There is a line coming from the trans that I do not know where it goes. I do not know where the EGR Valve is located. Basically I am lost and have no money for a manual (though I have heard that manuals do not explain Vac lines anyway). This thing is killing me. The idiot I got it from didn't even have an air filter in it (just open carb, he said he just rebuilt the carb). I wired the electric choke properly and now it starts first try every time and idles fine. All I know is that it originally came with a 305, it now has a 350 with a built cam. Any help with Vacuum lines would be appreciated. Charcoal cannister has about 7 hookups and only 2 being used.

Will it hurt that the flexplate and torque converter are exposed? I imagine that there should be a cover there, but nope!
 
I assume the vacuum diagram sticker on the core support is gone?

I can post a picture for the '85 vacuum line routing on the weekend...
 
The black "orb" is a vacuum reservoir for the interior stuff like heater controls and possibly the cruise control, it should have constant vacuum. The EGR should be hooked up to a Ported vacuum source (meaning, No vacuum at Idle, full vacuum at part throttle) Vacuum advance (on the distributor) should be hooked up to a ported source also. The purge canister should have constant vacuum also. The vacuum line coming from the Transmission should be constant also I think. Some one correct me on that one, things are a little fuzzy.
The Trans line goes to a Vacuum modulator, basically tells the transmission when to shift under load.
Hope that helps a little.
 

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