General Category > Quadrajet Carb Talk and Tips
help with 17082224
bruno:
mods feel free to move this post if it should be in another topic.
Cliff Ruggles:
I've been away for a few days, BURIED in orders and trying to finish up a few things.
Do you have control with both mixture screws after the clean-up?
I'd also make sure you don't have any leaks at the exhaust "channel" under the carb. That looks like one of those older intakes with the "hot-slot". There can be issues using a later carb on those intakes not sealing at the "U" shaped channel in the baseplate.....
bruno:
it is a “hot slot” manifold, but i did follow your directions a few years ago and plugged the holes at the ends of the slots with pipe plugs. i do have a metal spacer with a thin gasket under it, then the 1/4” gasket above.
i currently do not have control with the idle screws, or atleast very little. it will run decent with both seated. checked for coil bind, and that’s not an issue. will double check for vacuum leaks with some propane shortly.
bruno:
just confirmed there is not any vacuum leaks i can find. sprayed carb cleaner all around base of carb, throttle shafts, and intake. no reaction. i do get an immediate reaction with a tiny shot over the primaries though, so i assume i’d get same reaction if there was a leak somewhere.
vacuum at idle now is 16.5”. timing is set at 5 degrees btdc, and VA is adding 19 more for total of 24 at idle. seems to idle very smooth, but still only get about a 30 rpm drop with both mixture screws seated. when i cover the air horn, it does sound better. if i pull off a vacuum line, it immediately revs up 100 rpm. so maybe i’m closer than i thought?
still have no idea where timing “should” be.
bruno:
sorry for all the questions, but wondering about my throttle angle. i can turn down the idle to 450 ish, then any lower and it won’t stay running. is it possible too much of the transfer slot is exposed, not giving me control with the idle screws? i have the idle set at 750 in park right now. i don’t see any nozzle drip, but also have never seen it before, so maybe i’m missing it?
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