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Re: Re: Re: Re: '78 Chevy K-10 blues (Roch. Carb)
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Posted by Loren on December 24, 2004 at 18:11:47 from (12.108.31.11):
In Reply to: Re: Re: Re: '78 Chevy K-10 blues (Roch. Carb) posted by Bob S. on December 21, 2004 at 17:29:23:
Bob S. Do a little test and see if when you start it up and it begins to load up, open the choke a bit. If the choke is the problem that'll tell you. Bob is right on the pull-off connection, it's a little arm that sticks out and catches on the linkage to the rear. The arm points down from the pull-off.
Leave the air cleaner off and plug the hose. If I remember right should be from a port pointing UP from the #8(passenger's side rear)intake runner. Either there or from the pass. side lower rear corner of the carb. This port should have vacumm with throttle closed. The choke pull-off hose will come from directly below the fuel inlet on the carb(pass. side front lower corner of carb). Do ALL final adjustments with a cold engine. If it runs 5 or 10 minutes it's too warm to be accurate. Push the throttle to the floor and check to see that the choke is all the way closed. Pump it 2-3 times and it should start. If it doesn't and the choke is closed you've got other issues. When it starts watch the choke pul-off diaphram, should pull all the way back. If it starts loading up pull back on the pull-off and see if clears up a bit. If it needs help it's bad. If it's in all the way(towards the front of the truck)then it's an adjustment there or another issue. The adjustment is a screwhead facing the front of the truck either below the pull-off and tough to see, or above and in plain sight. For a leaner mix move the screw and watch the adjuster link, needs to move towards the front of the truck more. The choke stat(heat element) acts more of a timer. Don't try to adjust the amount of choke with it. Set it so it closes the choke well, but not hard. Q-Jets are a real good carb, very adjustable and the adjustments WORK. On a 71 there should only be one 3/8ths hose from the bottom of the carb to the PCV valve, a very short small hose from the front pass. side lower to the choke diaphram, and vacumm advance hose from the drivers lower front corner to the dist. It's a simple but reliable system. Email's visible if you need it. Loren
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