General Category > Quadrajet Carb Talk and Tips

choke pulloff linkage question and - 17080213

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Kenth:
Yes, flip the air valve link so the 90 degree bend will hang at the air valve. This link will hold the air valves closed in high vacuum as with low load on engine. At WOT it dampens the opening speed of the air valves and reduces fluctuations on the valves.

I have never seen a 1979 and later Truck Quadrajet using the rear dual purpose choke pull-off using also a front pull-off of any kind. Nowhere to hook it up.
1975 and later M-style Passenger Quadrajets on the other hand uses both front and rear pull-off

Kenth:
For some unknown reason i am having a hard time to post on this site, only parts of my posting will show.

I will try again.

Yes, flip the air valve link so the 90 degree bend will hang at the air valve. This link will hold the air valves closed in high vacuum as with low load on engine. At WOT it dampens the opening speed of the air valves and reduces fluctuations on the valves.

I have never seen a 1979 and later Truck Quadrajet using the rear dual purpose choke pull-off using also a front pull-off of any kind. Nowhere to hook it up.
1975 and later M-style Passenger Quadrajets on the other hand uses both front and rear pull-offs, and always with the front as the primary unit. The rear secondary p-o on these carbs works for faster opening of the choke-blade at hot engine starts to hold down emissions. The secondary p-o is really not needed on a modified engine and with the front primary unit properly adjusted.

tayto:
My 1986 non-CCC truck qjet only came with the front pull off, no rear pull off, also cliff only sent me a front pull off because mine didn't pass vac test.

Is that throttle lever actuator for anti-dieseling at shutdown? vs the electric ones for A/C idle?

Cliff Ruggles:
Kenth, LOTS of later 1980's truck Q-jets used a front pull-off as the "secondary" pull-off.  The rear has two links, the front one engages with the choke linkage to unload the choke only and is adjustable via the spring loaded screw on it.......FWIW......Cliff

Kenth:

--- Quote from: tayto on May 10, 2020, 04:38:34 PM ---My 1986 non-CCC truck qjet only came with the front pull off, no rear pull off, also cliff only sent me a front pull off because mine didn't pass vac test.

Is that throttle lever actuator for anti-dieseling at shutdown? vs the electric ones for A/C idle?

--- End quote ---

Some of the very latest made truck Qjets uses only the front/primary pull-off.
The throttle actuator on the truck units was aimed to reduce emissions by opening the throttle blades slightly at deceleration.

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