Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Freshly rebuilt quadrajet flooding from top of carb

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Cliff Ruggles:
When you get time call the shop and I'll set you up with some metering rods that will work.....Cliff

gregcarter:
Thank you Cliff for the jet needles. I installed them and I will test the cruise mixture on the freeway on Monday.

Unfortunately my idle is still stinky rich with no adjustment on the idle screws. The more I think about it, the more I think that this carb has always had a super rich idle since I bought it.

I had changed to .035 idle tubes but went back to .032 after still having a rich stinky idle. By the way, your new .032 tube collars are .060, not .061 like the old collars, they slid right in and popped out when I blew air through the main jet.

Anyhow, running the motor at a low idle, maybe 500 rpm, I backed out the idle screw until it was loose, and rotated the primary shaft. it closed a little more, and the rpm dropped about 50 rpm but did not stall. I ran the mixture screws in and out, and watched my O2 sensor read over .9 volt the entire time.

In the forum, I saw a few ways to address this problem, looking for nozzle drip, wrong gasket etc. Well, I finally used a flashlight and saw a drip on the passenger side, about a 1 drop every ten seconds or so. The driver side was dry.

My O2 sensor is on the driver side, and it is a split manifold with no connection so the richness on the right side wouldn't show up on the meter. The drip is not the original problem of overrichness

I am going to check the bottom gasket tomorrow and see if the bypass holes line up.

In the mean time, I am hoping that Cliff can recommend opening up the bypass holes to a larger size, and what size?

Here are the current specs:

idle tubes                                .032

idle channel restriction              a .043 drill fit, a .052 did not
                                               don't know where the inbetween bits are

upper idle air bleed                    .070

lower idle air bleed                    .062

idle bypass air                          .039

mixture screw holes                  .081

main air bleeds  (horn)              .042

main air bleed (body)                .042

main well bleed tubes                .025

secondary well tubes                 .070

main jets                                 .069

rods                                        .042

sec rods                                  DR

float                                       1/4 inch

Thanks ahead,
G. Carter

gregcarter:
Ok, I'm dumb. I just looked at the manifold and both sides of the manifold feed both sides of the motor, so my O2 sensor is picking up the drip.


I am going to check the bottom gasket tomorrow (no, it is not one of yours, and I'm sorry)and see if the bypass holes line up.

If the don't line up, ( I did check them last Friday night, but my eyes could have been tricking me. One hole lined up, the other, I'm not quite positive), I'll cut the gasket larger.

Thanks ahead,
G. Carter

Cliff Ruggles:
Probably ought to check the other gaskets as well.  Doesn't sound like you ever got a kit from us, so they may not be the correct gaskets either.....Cliff

gregcarter:
You just sold me the top gasket last week, I have your accelerator pump, and needle and seat in there, as well as 4 mabs, 2 idle tubes, and a atp screw, and new bushings. The only thing I can think of that isn't yours is the base gasket, and the throttle body gasket, which looks like an excellent quality gasket, just possibly with a slightly offset hole.
gc

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