something broke!

by driveit Sun Mar 08, 2015 10:56 pm

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!

by 77mali Mon Mar 09, 2015 5:53 am

I can't picture this part- post a picture.

by Wallyuph Mon Mar 09, 2015 11:44 am

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?

by Wallyuph Mon Mar 09, 2015 11:50 am

Show us what part you are talking about?
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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?

by driveit Mon Mar 09, 2015 12:41 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.

by thatfnthing Mon Mar 09, 2015 1:49 pm

That sounds like the accelerator pump...

by Dinomyte Mon Mar 09, 2015 4:14 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.

by Wallyuph Mon Mar 09, 2015 5:12 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.

by 77mali Mon Mar 09, 2015 5:43 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.

by Wallyuph Mon Mar 09, 2015 6:20 pm

If he put the one on I had on it its a Edelbrock Performer Carburetors 1407. 750 cfm electric choke.

by 77mali Mon Mar 09, 2015 6:30 pm

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

by driveit Mon Mar 09, 2015 6:48 pm

I think it is the pump. I am pretty sure that something is bent inside.

by chevellelaguna Mon Mar 09, 2015 7:58 pm

The plunger on the pump shaft is probably hanging up in the bore, just needs rebuilt, new accelerator pump assembly.

by driveit Mon Mar 09, 2015 8:10 pm

Do u think I need the whole kit or can I just get that part?

by chevellelaguna Tue Mar 10, 2015 8:44 am

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

by driveit Tue Mar 10, 2015 5:01 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.

by chevellelaguna Tue Mar 10, 2015 7:25 pm

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...

by bracketchev1221 Wed Mar 11, 2015 6:58 am

Take the carburetor off and see if it is still binding. Check the butterflies for interference on the base gaskets, look everywhere.

by 77mali Wed Mar 11, 2015 7:30 am

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.

by driveit Wed Mar 11, 2015 11:25 am

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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