Carter AFB problems

[threeonthetree]

Truck was running great start great idle great.

the other weekend i took it off road and things got a little rough.
in the mits of it the truck would not idle i would have to press the pedal to keep it going.

tryed tuning, blowing air back through the idle circuits. playing with the choke. nothing seems to work.


Truck will run great once i press the pedal but once it drops to idle it will either die or jump up and down in rpm not at all constant. everything seems to be working good..

has a brand new fuel pump fuel filter and the carb was rebuilt cause i was having trouble with it earlier in the year.. but it was working great up and till now.


and tips advice or comments are appreciated

[threeonthetree]

and another thing to add the truck doesnt seem to hesitate when the mixture screws are turned in all the way.

could the PO have damaged the seat if he tightened it in to far.

when i thread the right side mixture screw in it whistles.

thinking i should just put a quadrajet on...

[threeonthetree]

well screw the carter picked this up lets hope it works..

[Pyrotechnic]

Make sure the floats are adjusted properly. If the carb is flooding at idle, the idle screws will do nothing and it will die.

Make sure the needle and seats are still good. Again, if they don't seal well, the carb will flood. Carter's haven't been made for a good 20+ years now, has yours ever been rebuild? Even with a good set, all it takes is a little bit of dirt/trash to hold them open so make sure they are very clean.

[greenfc]

Crack it open and clean it. I have had this happen a couple of times. Its easy for crap to get in through the bowl vents and mess up the works.

[storm9c1]

Check for vacuum leaks?

[GASoline71]

Originally Posted by threeonthetree

well screw the carter picked this up lets hope it works..

Going from a Carter to an Edelbrock is like going from a Holley to a Holley. Same thing.

I would think the floats in the AFB got banged around and were hangin' up on you. A buddy of mine had an AFB on a 350 in a 1977 K1500 that he used to beat the snot out of in the hills. After a few good hard jolts... the floats would get stuck in that AFB.

Gary

[threeonthetree]

Originally Posted by GASoline71

Going from a Carter to an Edelbrock is like going from a Holley to a Holley. Same thing.

I would think the floats in the AFB got banged around and were hangin' up on you. A buddy of mine had an AFB on a 350 in a 1977 K1500 that he used to beat the snot out of in the hills. After a few good hard jolts... the floats would get stuck in that AFB.

Gary

yeah yeah; i know
the carter is just a piece beat and been through to many winters. installing the new edelbrock tonight got new gaskets so shouldnt have any vacum problems
its a automatic


one thing is where should my dizzy hook up too
vacuum all the time or the manifold vacuum?

[oldblue1968chevy]

Dizzy should go to the port on the driver side (full manifold vacumn) But if its automatic the transmission needs to get full manfold vacumn too

[threeonthetree]

i meant to say it s a Manuel
Truck is running 100 times better with the new edelbrock 1406 cant wait to drive it tomorrow.

its purrrrring!

[GASoline71]

Originally Posted by oldblue1968chevy

Dizzy should go to the port on the driver side (full manifold vacumn) But if its automatic the transmission needs to get full manfold vacumn too

Automatics were set up from the factory with a port off of the manifold. That's the best place to source vacuum for an automatic tranny.

Originally Posted by threeonthetree

i meant to say it s a Manuel Truck is running 100 times better with the new edelbrock cant wait to drive it tomorrow.

its purrrrring!

It's named after a Spanish guy?

Gary

[threeonthetree]

Haha Auto Correct
manual transmission it's got a 5 speed


what would have caused that carter to act up?

once i put the edlebrock on the engine fired right up and sounded like a different vehicle its running at about 900 rpm and it sounds strong and when i let the clutch out and put the brake on before it would kill and if its in granny the tire just spins it wouldn't do that before.


arnt they the same carb?

what should i look for when pulling the carter apart cause i got another truck it can go on.

[GASoline71]

Age... the actual AFB's have been discontinued for awile. Your accelerator pump was probably worn out, among other things.

Gary