Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

weird off-idle hesitation

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Marx3:
found an air horn with .026 discharge holes and installed it. This seemed to help some. The off-idle hsesitation is still there. I tried different settings for the APT... turning it down for a leaner jetting didn't really hange the hesitation. Raising the APT for a richer jetting didn't either.
I backed up the APT adjustment with a wideband ( mostly because I wanted to see if I could log the data and maybe spot a lean or rich situation when accelarating ). at 17:1 car runs fine but hesitates, at 14.8-15:1 the car runs a bit stronger, bit still hesitates. At 14-14.2:1 the car runs fine, but still hesitates.

What the heck?
What do you think about a 214/224@050 cam against a 2.41 gearing? potential trouble?

Jeffs68:
If the hesitation is right OFF idle, can you monitor what the A/F is doing at that moment? Might be a longshot, but maybe you can tell if it's a lean or rich problem.

Maybe the secondary air flaps are coming in too quick???

77cruiser:
Open up the DCR a few thou.

Marx3:
I haven't been able to log my runs, but it seems that the AFR takes a quick dive from 15:1 to around 12:1, when touching the accelerator. The secondaries are adjusted real well. Loosened them to the point of bogging and backed up a little. They are at about 3/4 of a turn. (3800 lbs car with 2.41 rear )
The engine performs excellent in every area, except for this off-idle hesitation.
I don't get it... Discharge is at .025-.026... Not exactly huge...
Why open up the DCR?
I am completely open to trying anything, but why?
 :-)

77cruiser:
Thought you had a lean hesitation, but I doesn't look to be.
Is the accel. pump giving a shot as soon as you touch the throttle?

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