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Topic: Binding in carb linkage

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

Binding in carb linkage

Posted: 2/1/12 6:29pm Message 1 of 21
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Pittsburgh, PA - USA
Joined: 12/4/2002
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Vette(s): 1979 L-82, 3 spd auto, car was originally Lt. Beige currently painted Sportsman Red, Doeskin leather interior, 103,000 miles......
I replaced that pesky accelerator pump and now I have what appears to be a tight spot or bind in the linkage....I took it apart and put it right back together.
 
has anyone encountered such a thing?? or have a sugguestion??
 
It feels like a knot right at the top of the accelerator pedal.......
 
Should that carb linkage be that tight, or should I be able to rev the motor by moving the linkage by hand?
 
 
 
 
 



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Re: Binding in carb linkage

Posted: 2/1/12 7:13pm Message 2 of 21
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Sykesville, MD - USA
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You should be able to move the linkage at the carb. If it's that tight, something's wrong! That's why I kept the quadrajet!
 
Barry
 
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Re: Binding in carb linkage

Posted: 2/1/12 8:13pm Message 3 of 21
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York, PA - USA
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Vette(s): 1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top
Looking at Barry's response makes me think you don't have the q jet anymore..but.. No carb should bind at all when hitting the gas pedal or by hand with the linkage at the carb.. is it possible one of those rods got bent a little when you took it apart?? It doesn't take much to bend those..maybe try and in hook the pedal linkage and see if the carb has free movement..if it does then maybe something from the pedal out is messed up.. if it doesn't then its the carb linkage itself..not knowing what type of carb you got will change things a little but most all carbs have little linkage bars on them that bend really easy.. maybe the pump you put in is suspect also..could be getting jammed up inside too..



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Re: Binding in carb linkage

Posted: 2/1/12 8:41pm Message 4 of 21
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Ya..what carby are we discussin here?
If it's an AFB/Edelbrock, it's possible you got the little "S" linkage on the acc pump upside down/flipped.
If it's a Quadrapuke, you may have put the roll pin in the wrong hole on the pump linkage arm, or may have slightly bent the carb tangs the linkage slips into to pivot on.
If it's a Holley.....ain't much you could do to screw that up, unless you put the spring on the wrong side of the diaphragm.



Joel Adams
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Re: Binding in carb linkage

Posted: 2/2/12 2:24pm Message 5 of 21
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Pittsburgh, PA - USA
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Vette(s): 1979 L-82, 3 spd auto, car was originally Lt. Beige currently painted Sportsman Red, Doeskin leather interior, 103,000 miles......
It is indeed a Edelbrock.....
 
The 'S' clip can be upside down??? Never gave that a thought.....
 
Maybe I didnt pay attention to that.  I'll try to flip it.
 
I did put on a new acclerator cable over the summer and everything was smooth until I did the pump.......
 
Thanks for the input...
 
 
What the best way to remove the S clip? I do recall it being a bear to remove......


|UPDATED|2/2/2012 2:24:45 PM (AZT)|/UPDATED|



Re: Binding in carb linkage

Posted: 2/2/12 8:59pm Message 6 of 21
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Duncanville, TX - USA
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Dan, if ya look at the "S" linkage, you'll notice that it is not completely flat, or straight. It has a slight bend in the middle. Hard to describe. In other words, if you lay it flat on a bench, it won't sit flat. If you flip the linkage around the wrong way, it can cause weird stuff to happen. If it is off-centered on the pump, it can bind a wee bit. Just a thought. Might not be the problem, but I've seen it happen many times on these things.





Joel Adams
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Re: Binding in carb linkage

Posted: 2/3/12 6:43am Message 7 of 21
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Pittsburgh, PA - USA
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Vette(s): 1979 L-82, 3 spd auto, car was originally Lt. Beige currently painted Sportsman Red, Doeskin leather interior, 103,000 miles......
Joel I see what youre talking about in the above photo...
 
Which way is up? (LOL probably opposite of how it is now)
 
Do I need to unscrew this here device to remove the 'S' clip properly??????


|UPDATED|2/3/2012 6:43:48 AM (AZT)|/UPDATED|



Re: Binding in carb linkage

Posted: 2/3/12 11:15am Message 8 of 21
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Dan, it's really more of a "bend toward the front, or bend toward the back" deal. The linkage itself is the same as far as which end goes up...it's how the bend in it is that matters. I would suggest just removing it, and turning it around. For instance, when you remove it, you'll have to move it either toward the carb, or away from the carb. Whichever way it comes out, just flip it around, and put it back the other way.
And yes, you'll need to remove the screw to do it.
Also, make sure your linkage from the throttle shaft is in the same hole as it was originally. There are three holes you can use, to change the geometry of the linkage, and pump output. Just use the same hole it was originally in.





|UPDATED|2/3/2012 11:15:57 AM (AZT)|/UPDATED|



Joel Adams
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Re: Binding in carb linkage

Posted: 2/3/12 2:47pm Message 9 of 21
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Pittsburgh, PA - USA
Joined: 12/4/2002
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Vette(s): 1979 L-82, 3 spd auto, car was originally Lt. Beige currently painted Sportsman Red, Doeskin leather interior, 103,000 miles......
I shall give it a try.....
 
One other question, I did advance the hole and the car ran better, no hesistation, still binding though.....Whats the proper hole, I had it the middle and got lots of hesiatation I currently have it in the hole closest to the carb itself......or shall I get rid of the bind and try each hole to see where it runs better....
 
Im a bit of an idjuit but doesnt the accelerator pump control the fuel flow to the secondaries when they open up? and the further out form the carb the linkage is make it depress quicker?
 
 
Im the Rook and I know just enough to be dangerous.....or start a fire.


|UPDATED|2/3/2012 2:47:32 PM (AZT)|/UPDATED|



Re: Binding in carb linkage

Posted: 2/4/12 8:13am Message 10 of 21
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Duncanville, TX - USA
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
The accelerator pump is only for adding a metered amount of fuel when accelerating from a stop, or while cruizing. It does not control the amount of fuel to the secondaries, or even the primaries...it simply adds an extra shot to overcome any leanness caused when opening the throttle. The position of the linkage on the lever(which hole it is in) changes the volume of fuel introduced at a specific throttle opening. The inner hole will give you a quicker shot, but for a shorter duration. The outer hole will give you a slower, steady shot throughout the throttle opening. Moving the linkage to different holes on the lever can help eliminate a "bog/stumble" on takeoff, depending on if the carb is putting too much, or too little fuel out.
I would first try to determine the exact reason for the bind, then play with the linkage in the 3 holes, to see which one gives the best overall gain. You can get it to where it feels great on takeoff, but bogs when trying to pass someone on the road...it's a balancing act.
hth



Joel Adams
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in Forum: C3 Fuel, Emission Control, and Exhaust Systems


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