General Category > Quadrajet Carb Talk and Tips

no control of idle mixture screws

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1bad79:
hi everyone I have a 17058253 I modified for my olds 455 in a g body cutlass I got it running in the car for the first time this week I notice its very rich at idle and even if I close off the mixture screws it still idles? I don't see any dripping at looking in the primary side at idle, and it starts good cold and warm I don't have a a/f gauge but will have something today yet im sure I screwed something up not sure what and im searching for what recipe I used could it be leaking internal from some where? im working on it some today in my shop so if anybody has any ideas let me know ill check back in a while hope fully with more info thanks steve

77cruiser:
I had an issue with a carb I did & it was coming from the secondaries, I think one of the air bleeds had some crap in it. Something to check.

carmantx:
Provide some details on your modifications to the Quadrajet and your engine.

1bad79:
I can't find what I did to the carb i had a sheet I made with all the sizes of what I modified I know I opened the idle circuit slightly opened the mix screw holes up added bypass air the engine is 461 chi aluminum procomp heads 9.985-1 compression and I can't find the cam card I'm looking for it but I bet it's with the sheet I can't find the cams not to wild I can tell you that but I was looking at it tonight and noticed Leak around the acc pump rod and top gasket so I have something going on so I'm going to pull it this week and Inspect and recheck what I did to it

Cliff Ruggles:
If fuel is getting up to the accl pump hole the N/S assembly isn't holding (flooding).  I'd correct that issue first, then re-evaluate the carb.

I can't provide any help at all otherwise, without all the engine details, and exactly what was done to the carburetor.....Cliff

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