Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Setting Up and Adjusting Idle
defiant1:
Good info on the PCV valve above.
Update to my situation:
Well I tried just installing 2 breathers and I had a lot of blow by. So, I installed 1 breather passenger side and one breather with a tube on the drivers side. I installed the PCV valve in line between base of carb and breather w/tube.
Instead of focusing on initial timing I set the timing based on mechanical advance. I set it at 33 degress all in before 3100 rpm. I checked my initial timing at this point and was at 13* @ 1100 rpm. It did not want to idle well at this point. So, I increased the timing to 15* and adjusted the fast idle and idle mixtures screw accordingly. So now I am at 35* all in before 3100 rpm. The only thing I don't know is the vacuum reading at this setting (still working on installing a permanent vacuum gauge).
Oh, and I wound up using the stock mechanical advance springs (sort of heavy-but not as heavy as the after market ones) and the aftermarket mechanical weights.
It runs the best at this setting, I still have an erratic idle while in drive with brake depressed and also while going reverse at slow speed. It idles around 750 rpm while in drive or reverse.
So I will keep tinkering with idle mixture screws and the throttle flaps.
d1
defiant1:
I am still trying to figure this carb out >:(
Pulled the plugs and they are very white, indicating a lean condition. The plugs have over 300 miles on them. What can I adjust to rectify this issue? What setting needs to change to richen up the mixture?
I am still having idle issues, but no nozzle drip. Which is good I guess.
d1
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