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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#72974 02/08/2007 6:52 AM | Joined: Nov 2006 Posts: 108 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2006 Posts: 108 | This is my problem...I put a new (rebuilt) carburetor on my truck tonight...starts fine..but I have to open the choke to get it to settle down...when I push the choke in...it idles to fast...and I can't get the motor to slow down...What do I do? Somebody give me a step by step on this...Just to make it clear...the little flap inside when it's closed the choke is open and when the flap is open the choke is closed..right..I feel kind of stupid right now... | | |
#72975 02/08/2007 12:45 PM | Joined: Sep 2003 Posts: 324 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 324 | Holcomb, you have it exactly backwords. When the flap inside the carb is closed the choke is closed, chokeing the air and inriching the fuel to the engine. If when the choke is open and the engine won't settle down start looking for a vacuum leak. | | |
#72976 02/08/2007 1:08 PM | Joined: May 2005 Posts: 1,624 Shop Shark | | Shop Shark Joined: May 2005 Posts: 1,624 | If you think you may have a vacuum leak there is an easly way to check. Get some carb or brake cleaner, the good stuff not water based. Start you enging and spray in samall squirts around where you would expect a vacuum leak to be. The carb base, the thru-shafts of the carb, etc. When you hit the leak with the spray the engine RPM's will pick up for several seconds. Just be careful with the carb spray as it is hard on you and fresh paint.
Six volt guy living in a twelve volt world
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#72977 02/08/2007 3:18 PM | Joined: Nov 2006 Posts: 108 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2006 Posts: 108 | Thank you for all your suggestions....the choke part is right now....I will look for a vacuum leak.... | | |
#72978 02/08/2007 6:03 PM | Joined: Dec 2006 Posts: 1,464 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,464 | Holcomb: You say the motor runs too fast when the choke is in? (open?). There's an idle adjustment screw, the one that comes in contact with the linkage, that you can adjust to bring the idle down. | | |
#72979 02/08/2007 6:47 PM | Joined: Nov 2006 Posts: 108 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2006 Posts: 108 | I'm sorry I said that wrong...when the choke is closed....it runs to fast...can't seem to get the idle to turn down.....so I have to open the choke to get it to slow down....
maybe this has something to do with it...I did buy a new (rebuilt)...the base to the new carb didn't work so I had to take the old one off and put it on the new carb....I changed out the old butterfly at the bottom with the new butterfly from the base that didn't work...Could that be why it is running so fast? Did I put the new butterfly somehow backwards on the old base? Because the idle screw doesn't really make a difference? Which way you turn it. | | |
#72980 02/08/2007 7:14 PM | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | see this pic - "A" is the idle mixture adjustment, turned alla way in, the engine should die - "B" is the idle speed adjustment, which should control the idle speed regardless of the choke setting, except that choking it will move the cams the lever presses against ... you may have gotten the main lever [with the B adjuster] on the wrong side of the top or bottom cams ... so yes, you may have got things together wrong Bill | | |
#72981 02/08/2007 7:28 PM | Joined: Nov 2006 Posts: 108 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2006 Posts: 108 | From the picture you show me..I think I might of put the arm a little off....my idle screw doesn't really touch the throttle arm..There's the problem...I got it I think...when I get off teaching...I will check it out....thanks guys..
My throttle arm has two holes...I think if I put the arm int he higher hole this will the solve the probem because it is leaving my butterfly wide open....that makes sense... | | |
#72982 02/10/2007 4:34 AM | Joined: Jul 2005 Posts: 1,158 Shop Shark | | Shop Shark Joined: Jul 2005 Posts: 1,158 | uh...
I don't know how the Rochesters behave, but my Carter W-1 opens the throttle when you pull the choke.
This is, AFAIK, normal behavior. | | |
#72983 02/10/2007 5:20 AM | Joined: Nov 2001 Posts: 1,519 'Bolter | | 'Bolter Joined: Nov 2001 Posts: 1,519 | Nice illustration RED58. Simple and to the point!!!
But i guess thats why we all love these old trucks.
Marty | | |
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