Topic: Electric Choke Conversion

[N PRGRES]

Hey Dave So do you just use those block off plates to prevent the hot air from still traveling under the manifold?   Where is the place with the best price on those Electric chokes?  I need one for a conversion as well!  THx

No the block off plates just seal off the hole in the top of the carb,  as far as price I just bought mine from Cliff RUggles.  Not sure if he is cheapest or not but I know if I have an issue I can call for advice and honestly I am tired ou dealing with it so I went with him.

[joe d]

Plug the hole. Even a minor leak can cause a problem with your a/f ratio. You can just use a small check ball or heck mix up some JB weld.

Thanks I'll see how it goes, I will try it without and if needed plug it later.  I can always go back and plug it is needed.

hey dave, the vacuum port MUST be plugged thats the one in the front of choke housing

[N PRGRES]

Plug the hole. Even a minor leak can cause a problem with your a/f ratio. You can just use a small check ball or heck mix up some JB weld.

Thanks I'll see how it goes, I will try it without and if needed plug it later.  I can always go back and plug it is needed.

hey dave, the vacuum port MUST be plugged thats the one in the front of choke housing

on the outside or inside?

[joe d]

outside frontlower part of choke housing

[N PRGRES]

outside frontlower part of choke housing

ok

[Burd Turd]

See, sometimes it's easier to just do the stock set up, one thing leads to another.

http://www.youtube.com/watch?v=JHYIGy1dyd8&ob=av3e

[N PRGRES]

Got the electric choke in today, probably won't be able to get it till the weekend.  ALso got a really nice gasket for it, probably the same one you got Burd

[N PRGRES]

OK Electric choke is installed and has power to it.  GOt the car running but I think I have to hook up the vac line behind the choke.  It is currently set to 3 notches to the right of center.

[Corellian Corvette]

If you're running the car as shown in this picture you have all kinds of vaccum leaks. You need the Secondary pulloff connected for sure, I don't know what the metal line is - it's either the hot-air valve on the drives exhast manifold, the vaccum advance, or the transmission modulator ALL of which need to be connected. 

Set the choke to the center notch to start. Otherwise you're tuning the choke to work out of spec.

Lastly, if there is a felt gasket between the choke housing and the electric coil, remove it. The coil grounds to the houing. That gasket was only to seal the hot-air choke.

[N PRGRES]

If you're running the car as shown in this picture you have all kinds of vaccum leaks. You need the Secondary pulloff connected for sure, I don't know what the metal line is - it's either the hot-air valve on the drives exhast manifold, the vaccum advance, or the transmission modulator ALL of which need to be connected. 

Set the choke to the center notch to start. Otherwise you're tuning the choke to work out of spec.

Lastly, if there is a felt gasket between the choke housing and the electric coil, remove it. The coil grounds to the houing. That gasket was only to seal the hot-air choke.

I realize there are leaks but I have to run the car to figure out which ports are sucking in air.  I don't care about the metal line right now, that runs to the trans.  Right now the question is where does the part that is "behind" the choke with the vac canister looking thing hook up to.  I will worry about the rest in a bit and there is no felt gasket installed

[Grand73Am]

They pretty much all suck air, so I would get a pack of vinyl vacuum pipe caps from the auto parts store and plug them all, including the ones on your vacuum tree that should be coming out the back of your carb. Some will be "manifold" vacuum, which have vacuum all the time when running, and some are "ported" vacuum, which don't have vacuum until the throttle valve is at a certain angle. So, if you just plug them off now, the car will run well, and you can connect the appropriate hoses to them later. The vacuum tree behind the carb is manifold vacuum. The secondary vacuum break, which is the can on the back of the carb that you're asking about, should be connected to manifold vacuum. So, connect it to one of the ports off your vacuum tree behind the carb. Also, that black line laying loose under your choke is for vacuum to your heat/ac panel on the dash, so plug it also to one of the ports off your rear vacuum tree.

There are diagrams in the emissions section of the Pontiac service manual for your car that show where the hoses go and which ports on the carb are manifold and which are ported.

[N PRGRES]

The carb does not have a rear vac tree and is not the stock motor.... 

So manifold vac should be sucking in air as soon as the car is fired, correct?

[Corellian Corvette]

+ 1

You need to plug them all, first. Once the motor is running, remove them 1-by-1 to determine which are ported (no Vaccum at idle) or direct mainfold (will suck air at idle)

With that many leaks it's going to be hard to keep your engine running.

The Transmission line needs manifold.
The Vacuum advance is ported (this depends on you, but stock was ported)
The secondary choke valve needs full manfold after the engine is warm. If you do not have the stock vacuum temp sender on the front of the manifold, just run to manifold vaccum.

[N PRGRES]

Ok, carb is on and all ports are plugged.  The secondary is connected to what I believe is manifold pressure.  Car runs as bad as it did before I went to this electric choke.  ugh, I hate carbs

[N PRGRES]

There is a metal plate on the bottom of the carb, does this go between the gasket and carb or between the manifold and gasket?