Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
No ported vacuum???
mrk3cobra:
I have a rochester quadrajet 17080229 on a 1986 chevy truck. The EGR is connected to port J on the quadrajet, according to the emissions lable on the motor this is were it should be connected. The truck will not idle because this port is manifold vacuum. I have tried all the ports on the quadrajet and they all have manifold vacuum.
Why would there be no ported vacuum on this carb. thanks,pete ???
Schurkey:
Throttle open too far?
Incorrectly rebuilt using wrong gaskets or mis-matched components?
mrk3cobra:
The Quadrajet is a new carb. The idle is at 750 RPM'S.
Is there a way to trouble shoot the problem?
69ttop:
I had a similar vac problem. My q-jet had no vacuum at the side tube because my professional
rebuilder installed the wrong throttle plate gasket which did not have the proper hole punched in
it. I had to rebuild the carb myself for it to function right. On my carb removeing the throttle plate made it much easier to see how the port channels were routed and made it much easier to use carb cleaner and blow air to clean the ports.
69ttop:
Sorry I forgot to add on the above reply that you might want to remove the throttle plate as well to troubleshoot your vacuum problem.
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