National carb install advice needed

VanWelder · Aug 19, 2018

Need direction on Reman National carb. Bolted it down hooked up linkage and fuel line. Started right up wide open. Can get it to idle. Disconnected linkage and backed out the idle adjustment screw, still full throttle.
1968 Bronco
289 V8/3 sp manual
Electric choke
Mechanical fuel pump
All vac ports are closed
Any advice will be appreciated.
BV

jagbucket · Aug 19, 2018

disconnect your linkage look down at throttle plates make sure they are closed, start again what is the result?

jagbucket · Aug 19, 2018

sorry i see u did disconnect are the throttle plates open ?

VanWelder · Aug 19, 2018

Plates are closed

oldiron · Aug 19, 2018

Is the throttle return spring installed?

VanWelder · Aug 19, 2018

Yes, spring is on and not too tight where it holds the throttle.

75MIKE · Aug 19, 2018

And you backed the idle screw off the choke linkage cam,as well?

jagbucket · Aug 19, 2018

what rpm do you think its running? if plates are closed you must have an open vacuum source, plug all manifold vacuum ports to test. if not that take the carb off and inspect that the throttle plates are indeed closed with a light. if they removed the butterflys they may not be centered correctly on the shaft btw is there play in the shaft? at that point i would return it. check the gasket that it is correct for your carb/manifold not leaving an open chamber under the throttle plate good luck hope you find it

VanWelder · Aug 20, 2018

I’ll be back at it this evening. I give it a try. Thanks and stay tuned

Rustytruck · Aug 20, 2018

Make sure your choke cam isnt keeping the throttle open.

National carb install advice needed

VanWelder

Newbie

jagbucket

Full Member

jagbucket

Full Member

VanWelder

Newbie

oldiron

Bronco Guru

VanWelder

Newbie

75MIKE

Sr. Member

jagbucket

Full Member

VanWelder

Newbie

Rustytruck

Bronco Guru

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