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Old 03-05-2010, 05:35 PM   #1
caffeineaholic
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Few questions about my Electric Q-Jet Carb

Hi all,

I have read "Common Problems and Solutions for Q-Jet Carbs" by Lars Grimsrud -- a technical article he published.

I do not know when this was published and so I wonder if my carb is supposed to be set up a little differently. The most important question I have is if my secondary throttle plates are supposed to not turn fully vertical. The article states they should instead point to the bottom of the secondary air baffle -- I'm just wondering if this depends on the year quadrajet. As far as I know no adjustments have been made to the secondary throttle plates and they by default turn fully vertical.

My next question is if the primary booster venturies (sp?) are damaged on the top (pictures are below) will this significantly affect driveability?

Also, are there some common problems that could cause my engine to die unless I force the idle speed higher (about 1,000+ rpm even when hot)?

I have a dozen+ more questions but these are the most important ones.

I appreciate any help. Thanks!


Left venturi




Right venturi




EDIT: My Q-Jet is model #: 17084201

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1985 Chevy Caprice small-block V8 305ci (5.0L) - 4-Barrel Q-Jet (E4ME) - 700R4 - 115k+ mi. - resonator and A/C components deleted.
Driven in severe weather most of the year (Arizona 100+ degrees during summer heat or in wet weather especially in harsh monsoons). About 30/70 highway/city driving.

Last edited by caffeineaholic; 03-05-2010 at 05:37 PM. Reason: forgot to add something
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