General Category > Quadrajet Carb Talk and Tips
Idle Bypass Air ??
beertracker:
If my fast idle is caused by a vacuum leak some where wouldn't adding idle bypass air only make the idle faster since the bypass air enters under the throttle plates?
429bbf:
yes you are correct in your thinking. but there has to be another problem . idle bypass the way i understand it . is a controlled vacumn leak . if all 4 throttle plates are indexed .spot on and totally closed . i still believe you would have to drill the holes a heck of a lot bigger to get it to run.fwiw
beertracker:
The idle system is per recipe 3. Wondering if I should consider changing it to recipe 2? Does this make sense? Recipe 2 would lean it out.
The search continues.
429bbf:
bt whats the part no. on your base plate? maybe i got an old one laying around here i can send you that you can drill out as large as you like that way you don't ruin a good one for you specific carb.iv got a pile of junk carbs and if i have what you need i will give it to you.as far as your question about going back to receipe 2 cliff would be the one to answer that. he's worked on more pontiacs then I've seen.
beertracker:
429bbf, lets hold off on the base plate for now but thank you for the offer. I looked on the sides and bottom of the base plate and couldn't find a number. Attached is a photo of the base plate it has two screw holes.
I did find a air leak at the air horn. After adding a second gasket on top of the first the engine idle speed dropped to 790 rpm. So I am making progress. More work to do.
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