how to adjust fual mixture - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hjalbert · 05-01-2002, 07:20 AM

well, my old quadrajet was running rich, and the adjustment screws were cut off and filled in, so i put another carb on it (a carter) i think ive got it running good, with each screww turned out about 2 1/2 turns counter clockwise, but am wondering how do i really know? is there a set way for doing this? thanks

------------------
Harry John Albert III
located in Eastern NC
1969 GMC C-10 Cab on a 197? 4x4 frame, with a 1978 305. and 4 on the floor.

1967 C-30 dually with a 74 350 police motor(dont know if that makes it special.)4 on the floor,
and a wooden flatbed.
1990 mazda RX7 conv.
72k miles mint. white
all stock

69 longhorn · 05-01-2002, 08:35 AM

Turn them clock wise 1 at a time till you drop rpms,then cc till you get the best idle speed. Do 1 side, then the other,then go back & do the 1st side a 2nd time. Then turn them slightly clockwise to get a 50 rpm drop in idle speed........69 longhorn.

05-01-2002, 07:20 AM	#1
hjalbert cracker Join Date: Sep 2001 Location: Wilmington, NC Posts: 1,021	how to adjust fual mixture well, my old quadrajet was running rich, and the adjustment screws were cut off and filled in, so i put another carb on it (a carter) i think ive got it running good, with each screww turned out about 2 1/2 turns counter clockwise, but am wondering how do i really know? is there a set way for doing this? thanks ------------------ Harry John Albert III located in Eastern NC 1969 GMC C-10 Cab on a 197? 4x4 frame, with a 1978 305. and 4 on the floor. 1967 C-30 dually with a 74 350 police motor(dont know if that makes it special.)4 on the floor, and a wooden flatbed. 1990 mazda RX7 conv. 72k miles mint. white all stock __________________ FOUNDING MEMBER OF THE DRUM BRAKE CLUB Harry John Albert III located in Phoenix, AZ 1972 GMC JIMMY, 1969 lwb Chevy Frame, 1999 bmw k1200 ltc 1992 Kawasaki concours 1991 bmw k75 1973 cortez motorhome

05-01-2002, 08:35 AM	#2
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	Turn them clock wise 1 at a time till you drop rpms,then cc till you get the best idle speed. Do 1 side, then the other,then go back & do the 1st side a 2nd time. Then turn them slightly clockwise to get a 50 rpm drop in idle speed........69 longhorn. __________________ http://community.webshots.com/user/hotrodhorn

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