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Username Post: Setting Edelbrock Carb Electric Choke ???        (Topic#101102)
dschribs 
Member
Posts: 25

Loc: USA
Reg: 01-05-05
05-17-05 07:20 AM - Post#698299    

I have a an Edlebrock 600 cfm carb with an electric choke and I am having problems with the engine running smoothly when starting the car after sitting for a few days. When it's warm, it runs perfect.
When I start the car cold, I get a very low (too low) idle and some white smoke out the tail pipes.
Can someone tell me what the first step I would take in adjusting the choke would be? Would I first try and adjust the fast idle linkage screw so that it idles higher when cold or is there another "first step" when calibrating the choke??

Thanks!

Dan

 
hotwheels57 
Senior Member
Posts: 8602
hotwheels57
Reg: 11-20-02
Re: Setting Edelbrock Carb Electric Choke ???
05-17-05 07:29 AM - Post#698300    
    In response to dschribs

Your owners manual has a full description on tuning your carburetor's features. You can go online to EDELBROCK's website and download the same manual. Click on "carburetor" and scroll down to the "manual" section.
http://www.edelbrock.com/automotive/index.html
Karma is the universal equalizer. The Ignore User feature comes in a close second.


 
dschribs 
Member
Posts: 25

Loc: USA
Reg: 01-05-05
Re: Setting Edelbrock Carb Electric Choke ???
05-17-05 07:56 AM - Post#698301    
    In response to hotwheels57

Hotwheels...
I did that and honestly, I am looking for something more like a step by step thing...

What do I check first - The choke position linkage or the fast idle linkage? or - something else...

Would be step one?????

Should the stop screw be on the top step of the fast idle cam with the choke closed???

 
hotwheels57 
Senior Member
Posts: 8602
hotwheels57
Reg: 11-20-02
Re: Setting Edelbrock Carb Electric Choke ???
05-17-05 08:27 AM - Post#698302    
    In response to dschribs

I have never had to adjust the "choke position linkage" on any EDELBROCK. There only adjustment I've ever had to make was to set the choke either a little leaner or a little richer by loosening the black choke cover and turning it clockwise or counter clockwise. The newer choke covers are marked with an arrow indicating the lean direction. The newer choke covers are marked with index marks for reference. The manual has pretty basic step by step directions to adjust for any condition you encounter.
Those EDELBROCK carburetors come from the factory set up pretty darn close for any application.
The mistake that I've made in the past with my HOLLEY type carburetors is setting the "fast idle screw" to deep into the notch on the linkage. That will cause a binding. On the EDELBROCK type carburetors, that cam is metal and no damage occurred, but on the HOLLEY type carburetors, the "fast idle cam" is plastic and setting the "fast idle screw" to deep into the notch will deform the plastic.
The "white smoke" (steam) you see when you start the car is an indication of moisture in the combustion process or more than likely, condensation in the exhaust system...that's pretty normal and once the moisture burns off from the heat generated, it should disappear. There's usually some residual moisture left in the exhaust system that doesn't get burned off completely, especially if you don't drive the car long enough, take only short trips, or only warm the car up (idling) in the garage/shop during the winter months. It'll usually show up on your concrete floor with a very wet dark sooty residue. If the "white smoke" is still visible after a lengthy drive (with engine up to operating temperature), you might have other issues to deal with in the motor.
These are the directions from the manual regarding the "fast idle linkage" and the "fast idle screw".




Quote:

To adjust the fast idle linkage (Figure 11) place the fast idle screw A between the two notches on the cam. Close the choke valve as far as possible without forcing it. The dimension C should be 3/64" between the choke valve and the air horn. To adjust bend rod D.

Fast idle may be adjusted to manufacturers specifications (usually 1500 rpm) during normal choke cold operation. The fast idle screw A can be adjusted with engine off and throttle held open to allow screw head access. Recheck fast idle speed after each adjustment.

The length of time during which the choke will stay closed is determined by the position of the choke cap. As the choke cap is turned clockwise the choke will stay closed longer. To properly set the choke turn the choke cap to the leanest notch on the choke housing, tighten the choke housing retaining screws, and run the engine until normal operating temperature is reached. With the engine running, slowly turn the choke cap clockwise until the choke valve begins to close. Now turn the choke housing one notch counterclockwise (LEAN) and tighten the choke housing retaining screws. Periodic readjustment of the choke will be required as the temperature changes throughout the year. After each adjustment verify that the choke valve opens fully after the engine is warm.






 
dschribs 
Member
Posts: 25

Loc: USA
Reg: 01-05-05
Re: Setting Edelbrock Carb Electric Choke ???
05-17-05 09:20 AM - Post#698303    
    In response to hotwheels57

I do have the "marks" on my cap. Turning it will only adjust the amount of time that the choke stays on - correct?? If my choke isn't setting properly, in other words, if it won't idle when cold, wouldn't that be more the linkage and the idle screw rather than a "cap" adjustment??

Really confused

 
hotwheels57 
Senior Member
Posts: 8602
hotwheels57
Reg: 11-20-02
Re: Setting Edelbrock Carb Electric Choke ???
05-17-05 09:46 AM - Post#698304    
    In response to dschribs

It might help if you provide some additional information about your application.
What year/make/model of Chevy are you working on? What motor displacement? What transmission? Is the motor stock or modified? Does the motor have any (other) "performance" modifications? What is the carburetor number you have? Is this a new carburetor, a used carburetor (inherited, from a friend or EBAY), an EDELBROCK remanufactured carburetor, an EGR equipped carburetor? The carburetor number will be stamped on the mounting flange, something along the lines of #1406. If this is a used carburetor, it may have been altered by the previous owner and you need to start any calibration from the basics.
You should pick up a book from SUMMIT RACING, JEG'S or your favorite source on the basics of carburetors, how they function and how they can be tuned for maximum performance or economy.
You may be addressing the wrong problem if the low idle is your goal to improve. The "idle mixture screws" (IMS) may need to adjusted (the owners manual provides full details on this procedure), your curb idle speed may need to be adjusted up slightly, your timing may need to be adjusted, you may have a vacuum leak, your carburetor could be incorrect or to big for your specific application. The carburetor could have some debris blocking the idle circuit...do you have an inline filter? Did you just install this carburetor and begin to experience the problems afterwards? What type of manifold do you have this carburetor installed on? Are the heat passages blocked or does the manifold have any provisions for heat passages? Did you install some type of adapter under the carburetor to mount to the manifold? What voltage did you hook the choke wire up to? What source did you use for the voltage? What fuel pressure does your fuel pump provide? Do you have a fuel pressure regulator/gauge to regulate the pressure down to the recommended 5.5-6#?
All of this information would be helpful. If I can't help provide you a solution, someone else will need this information to assist you.
Karma is the universal equalizer. The Ignore User feature comes in a close second.


 
Todcom 
Member
Posts: 15

Loc: New Zealand
Reg: 04-07-02
Re: Setting Edelbrock Carb Electric Choke ???
05-17-05 10:41 AM - Post#698305    
    In response to dschribs

My 1406 choke would play up from time to time so I ran an earth wire to the carb body and its been ok since.
86 C10 SWB 305/350
74 LT Camaro 350/350


 
305Chevy 
Member
Posts: 76

Loc: Lincoln, Nebraska
Reg: 08-02-04
Re: Setting Edelbrock Carb Electric Choke ???
05-17-05 10:54 AM - Post#698306    
    In response to dschribs

I've got an Eddy on my 305. I live in Lincoln, and in the winters it routinely drops below 0 farenheight. I've got my choke on the 3rd notch from "lean" and my fast idle cam is set on the very lowest setting so it fast idles around 1500rpm and I've never had any problems with it. If you run manifold vacuum advance, it might help.
'84 Caprice: 600cfm Eddy, RPM intake, ported 416 heads, rear frame brace, 9C1 police swaybars, Monroe Sensa-tracs


 
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