Cliff's Quadrajet Parts and Rebuild Kits
Quadrajet Problem Solving => Diagnose a Quadrajet carburetor problem => Topic started by: benbuff on April 09, 2019, 05:40:32 PM
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I got my carb back from cliff and installed it. Starts right up but even with the engine hot it stays on fast idle. My question is theres a vacuum looking port coming off the front of the choke housing, is it supposed to have vacuum? Its just open now. Its an electric choke with 12 v power running to it. Thanks, Ben
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The choke is adjustable as for "how long" it stays on. If you loosen up the three screws holding the electric choke unit and turn it a bit clockwise, that should shorten the time it stays on.
Are you positive you have 12 v to the choke while the ignition switch is on ? I'm guessing you do but never a bad idea to double check.
What is the carb number ?
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I'll have to look I don't remember. It is on a 79 k5 blazer if that helps. I checked it with a test light, but didn't actually test it to see how many volts. It worked before I had it rebuilt.
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We test them before shipping to verify the choke works with a 12 volt source, and dial in all the basic settings.
Haven't had any defective electric chokes to date, but if we installed a new one an you can verify it isn't heating up we'll replace it on our dime......Cliff
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Is the port coming off the front of the choke housing supposed to be open?
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Doesn't matter, the vacuum to the housing is blocked off.......Cliff
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Ok. Thank you.
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Try working the plates/flaps a few times with your fingers.
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I'll give that a try too. Thanks
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Fuse was blown for the choke. On a different note what should I set my pressure regulator at? I have a vortec block, so I am running a carter electric fuel pump.
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6 to 6.5 psi will work fine with the later carburetors. If you are running a return even better, to take some load off the pump.......Cliff