Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Idle Circuit Recipie Problems

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Novarolla05:

--- Quote from: TommyK on May 01, 2013, 03:42:57 AM ---What size are the idle mixture screw holes?

--- End quote ---

Mixture screw holes are .089

TommyK:

--- Quote from: Novarolla05 on May 01, 2013, 05:25:36 AM ---Mixture screw holes are .089

--- End quote ---

The 72 jet and 52M rod equal a very lean .00195  metering area. Does this carb have APT? If it does have you tried adjusting it to see if the idle improves?

Novarolla05:

--- Quote from: TommyK on May 01, 2013, 02:48:34 PM ---The 72 jet and 52M rod equal a very lean .00195  metering area. Does this carb have APT? If it does have you tried adjusting it to see if the idle improves?

--- End quote ---
It has an APT. I guess I forgot to mention when I increased the main bleed size, I also put in 74/52M. My bad. I can screw the APT out almost all the way, and there's no difference.

Today I went up to .064 on the idle channel which didn't do anything noticable. I tried driving with the accel pump diconnected, and there was no change in behavior. Seems to me that would mean its too rich because the pump definately squirts fuel instantly and strong. I feel like I need to start over, but I'm not sure what a good baseline would be. I'm open to any suggestions beacause I'm definately no expert on this  :)

Shark Racer:
What are the symptoms?

My car would shake and stutter at low RPM events, like moving in and out of a parking spot. (RPMS a few hundred Rs over idle)

Going down the road, passing, etc was all fine. Idle(no throttle) was smooth as well.

Novarolla05:
At low RPMs and idling in gear, it sounds like there is a misfire. Out of gear, the idle is really smooth. Sometimes when I'm driving and pull up to a stop sign, it idles fine for a few seconds then starts to get rough. When I slowly pull away from the stop, the engine sputters like crazy. Harder accelerations from a stop behave perfectly. Also. like you said Shark Racer, all other driving conditions seem fine.

I got to thinking yesterday (usually pretty dangerous  ;D) I'm running the stock torque converter, so could it be a bit too tight?

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