Quadrajet issue

buzzinhalfdozen · 10-03-2013, 09:51 AM

Have a freind with a big block, mildly cammed with a Q-jet that will not idle. Has a rebuilt carb can turn mixture screws in all the way engine still runs, says it's very rich, has completely closed throttle blades then just cracked open, still idles rich. Since the mixture screws seem to have no effect on how it idles can we assume it's bringing in fuel elsewhere? Could the pri. metering be the issue? Been a while since I've even seen a Q-jet, but doesn't it have a piston and hanger that pulls down with vacuum to seat the metering rods? Really can't come up with any other explanation. I've not personally seen the car merely going off what the owner is saying

10-03-2013, 09:51 AM	#1
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 984 Likes: 0 Liked 11 Times in 8 Posts	Quadrajet issue Have a freind with a big block, mildly cammed with a Q-jet that will not idle. Has a rebuilt carb can turn mixture screws in all the way engine still runs, says it's very rich, has completely closed throttle blades then just cracked open, still idles rich. Since the mixture screws seem to have no effect on how it idles can we assume it's bringing in fuel elsewhere? Could the pri. metering be the issue? Been a while since I've even seen a Q-jet, but doesn't it have a piston and hanger that pulls down with vacuum to seat the metering rods? Really can't come up with any other explanation. I've not personally seen the car merely going off what the owner is saying __________________ Joe Buchanan SS/BX 3117