carb question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

matt69 · 12-14-2002, 12:37 AM

got a question about a carb that i put on. i switched the stock 2bbl on my 307 to a 4bbl quadrajet. question is when i give it gas it hesitates really bad and sometimes stalls out and when i drive it will hesitate and sometimes stall, any ideas?

Blackhawkdc · 12-14-2002, 12:45 AM

Have you had the carb cleaned and rebuilt? New Fuel filter? If not, those are probably the first places to look. Also, how's the tune-up?

matt69 · 12-14-2002, 01:00 AM

i haven't done anything to it. i got it for free and it worked with no problems for the person that i got it from.

dion · 12-14-2002, 02:25 PM

Probably just needs some fine tuning by someone who really knows Q Jets, I put a new Q Jet on my truck and still had to spend some time with my Mechanic tuning it. Very sensitive carbs but once you dial them in they kick ass.

tai · 12-14-2002, 03:52 PM

try adjusting your primary jets to add or sutract fuel from the venturis

when your under the hood with the air cleaner off, and shes warmed up adjust the choke.
you may need more or less air

also try manualy turning the throtle at the carb ounce she is warmed up. if you throttle it and she begins to cut out you'er probly running fuel rich
turn your primary jets down until you have just a very slight stall. this means you're running a little wet(fuel rich) and helps the life of your valves

also if you get some cold rain your truck will **** and git.
tw71roid
good luck

mikep · 12-14-2002, 04:03 PM

huh

12-14-2002, 12:37 AM	#1
matt69 Registered User Join Date: Nov 2002 Location: spring lake, mi Posts: 58	carb question got a question about a carb that i put on. i switched the stock 2bbl on my 307 to a 4bbl quadrajet. question is when i give it gas it hesitates really bad and sometimes stalls out and when i drive it will hesitate and sometimes stall, any ideas?

12-14-2002, 12:45 AM	#2
Blackhawkdc 440 american Horses Join Date: Mar 2001 Location: Anoka, MN USA Posts: 470	Have you had the carb cleaned and rebuilt? New Fuel filter? If not, those are probably the first places to look. Also, how's the tune-up? __________________ Seth Petro 1969 Chev Short Step 425hp 350, TH400, big tires, fast truck 1979 Pontiac Trans Am 1991 Saturn SL1 - gas mileage! (and free) 1977 Buick LeSabre - for sale May America bless God, and may God bless America

12-14-2002, 02:25 PM	#4
dion 72 Cheyenne Join Date: Oct 2001 Location: San Diego Posts: 2,086	Probably just needs some fine tuning by someone who really knows Q Jets, I put a new Q Jet on my truck and still had to spend some time with my Mechanic tuning it. Very sensitive carbs but once you dial them in they kick ass. __________________ Burnout Idle 1972Cheyenne 1966/67Stouts

12-14-2002, 03:52 PM	#5
tai Registered User Join Date: Dec 2002 Location: bend oregon Posts: 32	check primarys try adjusting your primary jets to add or sutract fuel from the venturis when your under the hood with the air cleaner off, and shes warmed up adjust the choke. you may need more or less air also try manualy turning the throtle at the carb ounce she is warmed up. if you throttle it and she begins to cut out you'er probly running fuel rich turn your primary jets down until you have just a very slight stall. this means you're running a little wet(fuel rich) and helps the life of your valves also if you get some cold rain your truck will **** and git. tw71roid good luck

12-14-2002, 04:03 PM	#6
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	huh __________________ No truck :-(

12-14-2002, 01:00 AM	#3
matt69 Registered User Join Date: Nov 2002 Location: spring lake, mi Posts: 58	i haven't done anything to it. i got it for free and it worked with no problems for the person that i got it from.



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