How Do I adjust the...

[CenValyCali]

Originally Posted by ray_mcavoy

Q-Jet carbs have a mechanical linkage connecting the primary (front) throttle blades to the rear (secondary) throttle blades. But there is a lockout mechanism that keeps the secondaries from opening if the choke isn't fully open. So make sure your choke mechanism is hooked up correctly and fully opening.

Q-Jet carbs also have secondary air doors above the secondary throttle blades. The air doors are spring loaded and only open based on engine airflow demand. So it's perfectly normal for the secondary air doors (at the top/rear of the carb) to stay closed or only open a tiny bit if you simply rev the engine with the trans in park/neutral.

Is the backfiring something new since the carb rebuild? Or was it doing that before too?

It's something new. I've never ran this carb on my truck before either. I found it at a junk yard and rebuilt it. I've tried to adjust mostly everything but have no ****ing clue what a good starting point is.

I've got my jets set a 2 and a half turns
I'll be setting my idle adjuster on top of the carb to four turns tomorrow.

I've got to fix that choke. It's suppose to open all the way up right(up and down)? Right not it opens up at it's fullest at about 100 degree angle. I feel like it should be more of a 90 degree angle. Please help. I need to get this think Smogged