C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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some carb help please

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Old Aug 17, 2006 | 07:02 AM
  #21  
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Originally Posted by TheMongoose
yes, i can get more by hand. it goes full open.
Your throttle cable needs to be replaced or "shortened" or your pedal inside car is bent-if you want to shorten your cable--inside on the end of throttle cable is a farrel above pedal-if you make the cable shorter by putting a shim between farrel and pedal lever this will get you more throttle opening---one way is to put a nylon zip tie around cable next to farrel-between farrel and pedal lever---dont screw with bending your carb linkage at this point you already said you can get wide open by hand.

Last edited by ...Roger...; Aug 17, 2006 at 07:06 AM.
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Old Aug 17, 2006 | 07:13 AM
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Originally Posted by dwncchs
Your throttle cable needs to be replaced or "shortened" ---dont screw with bending your carb linkage at this point you already said you can get wide open by hand.
No adjustment on that setup dwncchs?
I cant see much from the pic but I believe Mongoose will be turning a few more RPM soon
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Old Aug 17, 2006 | 05:16 PM
  #23  
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Originally Posted by Bob Onit
No adjustment on that setup dwncchs?
I cant see much from the pic but I believe Mongoose will be turning a few more RPM soon
Yeah! Let me tell you my stupid Eclipse daily driver that the wife loves is faster than this thing on only 2 barrels
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Old Aug 17, 2006 | 06:25 PM
  #24  
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Originally Posted by Bob Onit
No adjustment on that setup dwncchs?
I cant see much from the pic but I believe Mongoose will be turning a few more RPM soon
No adjustment I can think of Bob unless there would be some kind of lever adjustment inside on the pedal-but I have never seen one.I have used the nylon tie shortening method and in some cases I have removed the pedal assembly -put it in the vise and bent the lever.Which might be best on Mongoose's car because he has a plastic guide between the feral and the lever.Mongoose check to see if pedal mount is broken.(anyone know how to spell feral ?)edit-also because the cable is of fixed length you might want to check anything that would effect the "engine to body relationship"-if they get closer together the cable will be less effective-things like engine or body mounts.

Last edited by ...Roger...; Aug 17, 2006 at 06:34 PM.
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Old Aug 17, 2006 | 07:45 PM
  #25  
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ok, I believe I understand how this works so far. What I can't figure out is how to make the arm in red closer to the arm in blue? If I shorten the throttle cable any more the idle on the car goes up. The two arms do contact each other with the gas pedal to the floor but they only travel together for maybe 1/8" before WOT. The other set of directions that indicated adjusting the screw for the air blades on the PS of the car does not appear to be my problem (at the moment). There is plenty of travel there for the blades to go open if there is sufficient vacuum. Right now my problem seems ot be mechanical in nature. the 2 arms need to contac tsooner. I would rather not bend the arm. Do you know how to adjust it?
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Old Aug 17, 2006 | 09:11 PM
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just a note, you have the stud/pin the throttle cable attached to in the outer holeof the throttle arm. if you move the stud/pin to the hole more towards the center of the arm/throttle shaft center line it will take less throttle pedal movement to actuate the throttle. (the shorter throw may solve your problem if i understand the problem correctly).

henry @ oles carb
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Old Aug 17, 2006 | 10:07 PM
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Well....... If it were me and a new cable was needed I would "Bubba" the current throttle cable while waiting for the new one
I would release the cable from the mount (Looks like the square 4 prong plastic type)

Then I would pull the cable towards the firewall and use a small hose clamp to lock it against the bracket to where there is just the slightest bit of slack in the cable which should give you WOT .........
It wont hurt anything and it's totally reversable.
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Old Aug 17, 2006 | 11:05 PM
  #28  
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Mongoose-is the trans downshift cable restricting the travel?Olescarb mentioned moving the pin closer to throttle shaft-not sure if it is movable-but you can measure it.I went out and measured one I have here.The pin is 1@1/2 inch from center of throttle shaft and the pin would have to be pulled back by cable 2 inches for full throttle.I would suggest removing throttle cable and operating by hand to see if you get full throttle-if not remove trans downshift and try again.
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Old Aug 18, 2006 | 06:25 AM
  #29  
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good thoughts. I'll try these tponight wen I get home. Dang, I feel like I'm close to 'going loud'!
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Old Aug 18, 2006 | 05:17 PM
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Originally Posted by olescarb
just a note, you have the stud/pin the throttle cable attached to in the outer holeof the throttle arm. if you move the stud/pin to the hole more towards the center of the arm/throttle shaft center line it will take less throttle pedal movement to actuate the throttle. (the shorter throw may solve your problem if i understand the problem correctly).

henry @ oles carb
EUREKA!!!!!!!!!!!!!

I now have a Quadrajet! I moved the pin to the outer hole and that has it working again. It needs tuned for sure. Now I have the quadrajet bog as the secondaries go open. Not too bad but noticeable. I'll get a jet and rod kit and go through the instructions. Damn you should have seen all the brown smoke come out when I hit WOT the 1st time! What a cloud I left behind. By the time I got back home it was clean again so I figure it was just junk laying in there, etc.

While I was there I took a chance and put the tranny kick down pin in the outer hole also because it wouldn't hold past 3000 rpm at WOT before. Now it pulls all the way to redline before shifting.

There goes my gas mileage...not that 12mpg was good anyway
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Old Aug 18, 2006 | 05:46 PM
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Originally Posted by TheMongoose
EUREKA!!!!!!!!!!!!!

I now have a Quadrajet! I moved the pin to the outer hole and that has it working again. It needs tuned for sure. Now I have the quadrajet bog as the secondaries go open. Not too bad but noticeable. I'll get a jet and rod kit and go through the instructions. Damn you should have seen all the brown smoke come out when I hit WOT the 1st time! What a cloud I left behind. By the time I got back home it was clean again so I figure it was just junk laying in there, etc.

While I was there I took a chance and put the tranny kick down pin in the outer hole also because it wouldn't hold past 3000 rpm at WOT before. Now it pulls all the way to redline before shifting.

There goes my gas mileage...not that 12mpg was good anyway
Thats good news for sure
The rods and jets dont wear out so I am curious as to why you need a jet/rod kit?
Did you make changes to the engine? Headers, performance upgrade ect?

12 MPG is not optimum but now that the secondary circuit is working you may see a milage improvement

What are the symptoms that would lead you to believe a rebuild is in order other than the "Bog" ?
The bog can sometimes be cured with a simple adjustment of the secondary air valve.

Fill us in please
And congrats on getting your QJ working almost the way it should be.

You can always trust olsecarb, sixfooter, dwncchs, Big Blockk, Rockn-Roll and Lars (even if he was to busy to reply to your post) as these are the guys (among others) that have guided me through my quest to understand and the QJ

It really is a great Carb......
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Old Aug 18, 2006 | 05:52 PM
  #32  
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Originally Posted by dwncchs
(anyone know how to spell feral ?)
Ferrule... and dont you forget it!
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Old Aug 18, 2006 | 06:02 PM
  #33  
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Originally Posted by Bob Onit
Thats good news for sure
The rods and jets dont wear out so I am curious as to why you need a jet/rod kit?
Did you make changes to the engine? Headers, performance upgrade ect?

12 MPG is not optimum but now that the secondary circuit is working you may see a milage improvement

What are the symptoms that would lead you to believe a rebuild is in order other than the "Bog" ?
The bog can sometimes be cured with a simple adjustment of the secondary air valve.

Fill us in please
And congrats on getting your QJ working almost the way it should be.

You can always trust olsecarb, sixfooter, dwncchs, Big Blockk, Rockn-Roll and Lars (even if he was to busy to reply to your post) as these are the guys (among others) that have guided me through my quest to understand and the QJ

It really is a great Carb......
I have a set of long tube headers and sidepipes waiting to go on! I also have a 30yr old cat waiting to come off!!
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Old Aug 18, 2006 | 07:48 PM
  #34  
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Originally Posted by Bob Onit
Ferrule... and dont you forget it!
Thanks Bob-I knew it was wrong but couldnt find it in the diktaonary !!
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Old Aug 18, 2006 | 07:56 PM
  #35  
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Originally Posted by dwncchs
Thanks Bob-I knew it was wrong but couldnt find it in the diktaonary !!
Thats acuz you spelt it rong wile lokin it up in a dickshinary.... stoopit
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Old Aug 18, 2006 | 08:11 PM
  #36  
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Originally Posted by TheMongoose
I have a set of long tube headers and sidepipes waiting to go on! I also have a 30yr old cat waiting to come off!!
Well I would try and get the current carb running great before you do any mods
If it ran fine at one time it will run fine again without any changes as long as no mods were made.

I would take it apart, clean it and reassemble it ... with a new kit of course
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