Next Noob Question- secondary's not opening

[dave silva]

The coach starts easy and runs smooth, takes off nicely but when i put my foot in it very little happens-

I ran it with the cover off and watched the carb- secondary not opening. I poked around a bit and i understand it has something to with the choke
being fully open.

And there's a vacuum diaphragm in front that does something?

If someone could explain what normal operation looks like i can probably form a more intelligent question.
--
Dave & Ellen Silva
Hertford, NC

76 Birchaven, 1-ton and other stuff

Currently planning the Great american Road Trip Summer 2021

It's gonna take a lot of Adderall to get this thing right.

 

[LQQKatJon]

1. Some q-jets have a little tag on far passenger side of choke that blocks the secondary from opening. When choke is fully open that should push
the tang in and allow the secondary to open. Try opening the secondary by pushing open with screwdriver. You should see how that works.

2. Secondarys open when vacuum is low. Basically a vacuum
Plunger holds them
Closed. As you hammer
The has vacuum drops and the plunger no longer has ability to hold them closed. Think opposite of how your cruise
Control
Works.

Having a vacuum gauge to diagnose is helpful. They rarely open in normal driving. You have to be smashing the throttle down. Just putzing normally
you may not see them
Open.
--
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/

 

[john r. lebetski]

If the choke is fully open, the lockout tab clear and they still don’t open try this test. Push down on the larger rear part with your finger and
the air valves should not touch or scrape the air horn. If they do, just loosen the air valve screws about 3/4 turn and recenter the air valve plates
on the shaft so they do not touch anything, then resnug the 2 screws on each. Do not loosen more than a turn or you risk dropping them into the carb
and engine. The screws are thinner than the holes in plates to allow adjustment.
--
John Lebetski
Woodstock, IL
77 Eleganza II