Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Idle Air Bypass

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carmantx:

--- Quote from: DrSpencer on March 05, 2016, 01:42:59 PM ---Hello Cliff-The high temp RTV that I initially used to plug the idle bypass holes has softened over time, causing the carb not to idle properly, once again.

What material do you suggest I use to plug the idle bypass holes? Would JB Weld be sufficient?

Thanks

--- End quote ---

Use Marine Tex epoxy.

von:
I've used Marine-Tex for reducing idle air bypass openings. Plug the hole then drill to desired diameter. JB Weld would work too since it's air only. If you want to experiment with different diameters, you could measure the hole dia before plugging so you could later go back to original, then plug the holes and start with a small dia drill bit and increase til you find the "sweet spot" or re-plug to back up to a smaller dia.

bry593:
I was going to plug my bypass, but then noticed the lower gasket blocks this passage.  Gee, that was easy. 

Moral of the story is ask Cliff if a gasket is available that will block off the idle bypass air holes.

bry593:

--- Quote from: von on March 06, 2016, 02:31:37 AM ---I've used Marine-Tex for reducing idle air bypass openings. Plug the hole then drill to desired diameter. JB Weld would work too since it's air only. If you want to experiment with different diameters, you could measure the hole dia before plugging so you could later go back to original, then plug the holes and start with a small dia drill bit and increase til you find the "sweet spot" or re-plug to back up to a smaller dia.

--- End quote ---

It is not fuel that causes JB weld to unstick.  It is the constant heat cycles.  However, it should work for awhile, just as it works for awhile on the well plugs.  Be sure to clean the metal well and etch the surface (a diluted acid followed by rinse) so it has the best chance of sticking.

bry593:

--- Quote from: bry593 on March 06, 2016, 01:29:49 PM ---I was going to plug my bypass, but then noticed the lower gasket blocks this passage.  Gee, that was easy. 

Moral of the story is ask Cliff if a gasket is available that will block off the idle bypass air holes.

--- End quote ---

I was wrong, my gasket does not cover these holes.  Will be plugging with brass setscrew.

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