General Category > Quadrajet Carb Talk and Tips

67 GTO 7027262 Fast Idle

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rickmpontiac:
I have a recently restored 7027262 on my 67 GTO that idles at about 1,000 rpm. I

rickmpontiac:
My previous post was truncated.

I have a recently restored 7027262 on my 67 GTO that idles at about 1,000 rpm. I adjusted the idle mixture screws and running at operating temperature with choke fully disengaged I cannot adjust the idle speed. The stop on the throttle arm is not touching the idle speed adjustment screw. It is actually backed out all the way. I can put pressure on the throttle arm and get the idle speed down to about 800-850 rpm. I removed the carburetor to look for anything obvious like damaged throttle plates, throttle shaft binding, etc. I checked for vacuum leaks and ignition timing.

Any thoughts or suggestions?

Thanks,

Rick

WideTrack:
Twisted throttle shaft?  Or the plates weren't closing all the way when they were torqued down on the shaft during assembly?  Or too much idle bypass?

77cruiser:
Are the secondarys closing all the way?

Cliff Ruggles:
If you are using the 1967 factory intake check to make sure the correct gasket is used under the carb with the stainless steel shim gasket on top of it directly against the carburetor.

Check the timing to make sure it's not too advanced.

Assuming no vacuum leaks anyplace check the throttle plates in the baseplate to make sure they are closing all the way and sealing tight in the bores.....

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