Aisin carb 35210 stuck on high idle

[Lwilliams]

New to the forum and have used the search function but have not come up with an answer.  I recently purchased a 1983 Toyota truck.  Drove great for the first 100 miles then while driving the carburetor stuck on high idle.  Stomping the footfeet has little effect on reducing the idle.  I've checked for vacuum leaks and have found none.  Wondering if it's rebuild time/Weber swap or possibly something more obvious.  Thanks for any help I get.

[Lewis Hein]

Check your auxiliary acceleration pump diaphragm. Mine suddenly started idling around 2000 RPM one day and that was the cause. When it gets torn it can start leaking extra fuel into the engine continuously.

[Gnarly4X]

Welcome aboard.

Before tearing into that carb, you might want to verify exactly what is causing the fast idle. 

How many RPMs is it fast idling at?  Does the fast idle RPM change?

Does it fast idle at cold start?

That carb is a fairly complex design so there could be a number of issues causing a fast idle.

As you know, there are other things that can cause a fast idle.

Are you completely satisfied there are no vacuum leaks – tubing, carb gasket, intake manifold gasket, loose nuts and bolts?

Have you checked the ignition timing and the entire throttle linkage?

Has the engine been recently tuned?

Are you driving the vehicle in a big change in elevation?

Have you recently added any kind of fuel additive or carb cleaner?

Please let us know what you discover.

Gnarls.

[Lwilliams]

Well, I decided to look at the diaphragm on the accelerator pump and got a little ham fisted.  The cap would not come loose so I smacked it with a screwdriver breaking part of the carburetor itself.  Long story short is I ordered a 32/36 and will learn how to tune one of those instead of this aisin.