I've got the typical carter problem of stalling on decel, and I want to check my idle pickup tubes
(that's what my Chiltons manual calls them}, and stepper motor. It describes their removal while
talking about a complete rebuild. Can I remove them without any dismantling of the carb?
Also, I have a crack in my exhaust manifold, just downstream from the O2 sensor. Could air get
sucked in with backpressure while in decel and affect the O2 reading, causing me to stall? The engine
is starved for fuel when I start it again. Idle screw is cranked almost all the way in.
Thanks for any help!
It's actually pretty easy. First check it out by looking down the carb with the engine idling, if there is a problem with the tubes, u will see a slow dripping from the venturi. Then, Remove choke plate, look down carb, and remove screw holding down venturi, pull venturi straight up, and clean tubes real good with carb cleaner and wire. Re-install, and start her up.
Make sure you dont blow out the check ball that remains in the carb after removing the venturies/idle tubes. If it falls in the carb and you start the motor you wont have to worry about your dirty carb anymore! If the crack in your manifold is sucking in air on decel (it shouldn't...there is still positive pressure in the exhaust system) then your O2 sensor would read a lean condition, causing the carb to go rich. Hope this helps!
Please let me know what you find. I'm in the exact same situation, but I've already checked the venturi tubes..My question was whether or not the O2 sensor, If not functioning properly, could cause the same problem (stalling at every stop light). I also had a crack in my intake, and was able to pick up a used (and guaranteed) from All-American Auto Salvage in Rahway, NJ. I've been stuck on this problem for days....my idle screw is all the way in, and when the engine does decide to idle it does so at about 1700 RPM.