Posted by Steve@Advance on June 29, 2022 at 18:06:15 from (99.190.215.237):
In Reply to: Need a Quadrajet guy posted by Fritz Maurer on June 29, 2022 at 17:40:44:
The dashpot is vacuum controlled to let the throttle ease closed for whatever reason, possibly to prevent exhaust backfire if it had a smog pump or AIR emissions on the manifolds.
Chances are the dash pot is stuck or the diaphragm bad. I wouldn't worry about it. The idle is set by the screw down below, the fast idle set by the choke cam, so the dash pot not really necessary.
There is also a choke pull off servo, did you check or replace it? That is important.
Float should be replaced too, they would sink.
If the fuel filter has the check valve spring in the end, take the spring out. Useless and can restrict the fuel flow.
I don't know how available tuning parts are for Q jets anymore, used to have boxes of that stuff. That's what made Q jets so good! They were tune able, could keep my OCDC going for days! LOL
It's common to connect the vacuum advance to manifold vacuum. Did you check the vacuum advance? Did you check the centrifugal advance? Both are very common to need attention regularly.
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