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something broke!

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Post by driveit Mon Mar 09, 2015 4:56 am

Headed home Friday and my throttle kept sticking closed. The same thing happened when I first installed this engine. I recently swapped back to make use of the electric choke which I love BTW. So we found when installing it that where the throttle connects to the top of the carb to this small black plunger. This plunger is binding up when the throttle is pressed. On my way home it got stuck and the engine died. I had to press the gas Dow about half way to get it started back. When I did I felt something give king carb. Now it is stuck at nearly full throttle. Help!
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Post by 77mali Mon Mar 09, 2015 11:53 am

I can't picture this part- post a picture.
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Post by Wallyuph Mon Mar 09, 2015 5:44 pm

I think he is talking about choke butterfly I believe. If its stuck shut did you hook up the ignition wire that is hot with key on to the round black coil on the Passenger side. One wire is to ground one wire is to hot with key on.

There are also 3 torx screws on the side of the round black choke that you can adjust it.

Or are you talking about the linkage on drivers side that goes to the accelerator pump?
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Post by Wallyuph Mon Mar 09, 2015 5:50 pm

Show us what part you are talking about?
something broke! <a href=something broke! 350car10" />

Undo you throttle linkage from the gas pedal to carb and make sure carb operates freely. If not then you know its in the carb area. If it works freely then your linkage is binding.


Did you use the 1" black phonalic spacer that was under the carb between intake and carb that was on it?
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Post by driveit Mon Mar 09, 2015 6:41 pm

If you are looking at the front right side from the previous image posted it is where the throttle linkage connects to a small s shaped clip to a black plastic rod coming out of the top of the carb. Tried to upload a photo from my phone but had no luck.
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Post by thatfnthing Mon Mar 09, 2015 7:49 pm

That sounds like the accelerator pump...
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Post by Dinomyte Mon Mar 09, 2015 10:14 pm

Sounds like accelerator pump to me too. Try some WD-40 after removing the throttle cable and see if things loosen up and work freely. hopefully you haven't bent something which will be a whole lot harder to figure out.

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Post by Wallyuph Mon Mar 09, 2015 11:12 pm

Dinomyte wrote:Sounds like accelerator pump to me too.  Try some WD-40 after removing the throttle cable and see if things loosen up and work freely.  hopefully you haven't bent something which will be a whole lot harder to figure out.


Yep that sounds correct.
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Post by 77mali Mon Mar 09, 2015 11:43 pm

What model carb is it?

Check your throttle return springs too. That's the only time I've ever been stuck @ wide open. Darn thing broke.
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Post by Wallyuph Tue Mar 10, 2015 12:20 am

If he put the one on I had on it its a Edelbrock Performer Carburetors 1407. 750 cfm electric choke.
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Post by 77mali Tue Mar 10, 2015 12:30 am

Those are nice ones.

If you don't have this info- these are the manuals.  

http://www.edelbrock.com/automotive/misc/tech-center/install/1000/1407_manual.pdf

http://www.edelbrock.com/automotive/misc/tech-center/install/1000/Performer_Thunder_Carburetors_130815.pdf
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Post by driveit Tue Mar 10, 2015 12:48 am

I think it is the pump. I am pretty sure that something is bent inside.
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Post by chevellelaguna Tue Mar 10, 2015 1:58 am

The plunger on the pump shaft is probably hanging up in the bore, just needs rebuilt, new accelerator pump assembly.
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Post by driveit Tue Mar 10, 2015 2:10 am

Do u think I need the whole kit or can I just get that part?
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Post by chevellelaguna Tue Mar 10, 2015 2:44 pm

Once you open the top air horn the gasket may be compromised so I would say the whole kit. Take the arm off of the accelerator pump rod and see if the rod goes up and down without binding in the bore, if it's hanging up then that's the issue
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Post by driveit Tue Mar 10, 2015 11:01 pm

It was binding and got stuck when driving. Usually I could tap on the pedal and it would free up. That last time it felt like something gave inside the carb.
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Post by chevellelaguna Wed Mar 11, 2015 1:25 am

So what's binding? You need to find out whether it's the accelerator pump, the throttle cable or the carb linkage.....I just don't know what else to say...
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Post by bracketchev1221 Wed Mar 11, 2015 12:58 pm

Take the carburetor off and see if it is still binding. Check the butterflies for interference on the base gaskets, look everywhere.
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Post by 77mali Wed Mar 11, 2015 1:30 pm

x2

"Performer and Thunder Series AVS Carburetors
Rev. 8/15/13- QT/mc
Page 8
©2013 Edelbrock LLC
Brochure #63-0061
CALIBRATING THE PUMP
The pump plunger is not driven directly by the throttle, but
through an intermediate Pump Drive Spring that extends the
duration of the “pump shot” past the time the throttle stops
moving. The Edelbrock Performer and Thunder Series AVS
carburetors have an external pump lever with three hole
locations for link attachment providing three distinct pump
delivery curves (Figure A).
If you encounter any hesitations or stumbles that do not seem
to be related to the basic metering or have not responded
to changes in the basic metering, move the pump drive link
to one of the holes closer to the carburetor body. This will
increase the stroke length of the plunger and result in more
pump delivery. See page 11 for factory Pump Drive Link
Locations."

Check to see if your location is correct on that linkage from the throttle assembly to the pump arm.  On the #1407, it s/b placed in the top hole.  If it is in the correct location then maybe the pump is somehow broken or stuck.
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Post by driveit Wed Mar 11, 2015 5:25 pm

Pretty positive that its the pump. Hope to teat it soon. Wishing I had a garage so I wouldn't have to work in the rain.
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