Q-jet idle problems - Team Camaro Tech
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post #1 of 4 (permalink) Old Apr 28th, 02, 04:53 PM Thread Starter
Join Date: Feb 2002
Location: Missoula, MT USA
Posts: 6
My 69 quadrajet will run but the idle will not change, no matter what. I put a basic kit in and there's no difference. There's almost no play in the throttle shaft. The car's an auto. and the idle won't go below 1,300 in park. This carb was on the shelf for a while. Any ideas?
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post #2 of 4 (permalink) Old Apr 28th, 02, 06:22 PM
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Join Date: Mar 2002
Posts: 73
Fast idle screw? Also check to make sure your linkage isn't hanging up.

I just remembered...make sure your fast idle screw is on the proper stop when you adjust it.
[This message has been edited by Glenn1018 (edited 04-28-2002).]

[This message has been edited by Glenn1018 (edited 04-28-2002).]
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post #3 of 4 (permalink) Old Apr 28th, 02, 06:31 PM
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Join Date: May 2001
Location: Ashby,MN, USA
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all the vacuum hoses hooked up and in good shape? is the choke fully operatonal and properly adjusted, including the fast idle screw? unhook the throttle cable(or rod), and see if it idles down then. maybe the timing is too far advanced, or something stupid like that.

1971 Nova(looks like 69 camaro from underneath!)
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post #4 of 4 (permalink) Old Apr 29th, 02, 10:01 AM
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Join Date: May 2001
Location: Austin TX USA
Posts: 501
Yes, I'd first look at the fast idle screw.

Next, is your timing way advanced? You say it runs fine otherwise so perhaps your timing is ok.

Here's what I'd do...take the carb off. Inspect the primary throttle plates (butterflies). You'll probably see they aren't completely shut as they should be with the idle screw not touching the throttle lever. See if you can determine what's preventing them from closing. Perhaps, the geometry between the two primary butterflies on the throttle shaft and the carb base has changed. If you suspect this, remove the carb base (the lower part of the carb), and carefully loosen the four screws the that attach the throttle butterflies to the throttle shaft and allow the plates to re-seat themselves (DO NOT REMOVE THESE SCREWS...only loosen, with WD-40) about 3/4 of a turn. Once they've 'centered' themselves, retighten the screws.

Upon the above inspection you determine the butterflies are completely closed, I'd look for a stuck power piston...stuck open, which can elevate your idle...also makes things rich.

See if the above works...if not, e-mail me...I have a few more ideas if these don't work.
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