Engine stalling - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMC69 · 11-10-2007, 08:45 PM

Well after I finally got the truck on the road tonight, I discovered that when you come to a stop, then try to get going again, it wants to stall, and sometimes does.

Even after warming up it has that hesitation. I tried feathering the throttle to prevent it from stalling, but that doesn't always help. I found that when I come to a stop I have to keep the rpms up a bit and it is fine.

My guess would be a carb issue. But not sure where to start looking

and on a side not, I also discovered that my rad leaks and will most likely have to replace it.

It is a 305, carburated if that helps.

Thumpin455 · 11-10-2007, 09:26 PM

What carb does it have?

GMC69 · 11-10-2007, 09:30 PM

Quadrajet. I have one on from a friend, and I think I will put the old one back on that came with the truck, since it was the water in the old tank that was causing issues back when I bought it.

I replaced the tank and it's fresh gas, plus I emptied the carb of any water back when I did the tank.

So right now I have 3 quadrajet carbs here. the original one, one from a friend ( on the truck now), and one from the wrecking yard.

spudz · 11-10-2007, 09:41 PM

no vac leaks?? spray carb cleaner in isolated areas with the engine running, if the idle changes.. your leaking.. ALSO WEAR EYE PROTECTION! Also is your timming on? vac advance work?

chev74 · 11-11-2007, 10:25 AM

what recent changes have you made besides the carb?- even though it sounds like a carb thing. i had put a Holley 750 on my 350 and it would want to die too, found out it was dumping WAY too much gas in, so i had to change the jets.

Anyone know if all quadrajets came with the same size jets?

xtreme80 · 11-11-2007, 12:57 PM

Your carb is leaking gas into the engine. I would find it very hard to believe that a Q-Jet could be rich enough to dump too much gas. I'd bet good money that it's dumping too much gas because of a leaky carb, and that's what's causing both your hesitation and the stalling.

mhicks · 11-11-2007, 03:44 PM

Timing......

bowtier · 11-11-2007, 04:16 PM

New fuel filter on it?

chev74 · 11-11-2007, 04:54 PM

advance?

GMC69 · 11-11-2007, 05:35 PM

Filter is new. It could be a leaky carb. I find it pretty hard on gas also. mind you I am used car, but still. I don't drive that far to work ( 10 mins) and I can almost see the gauge moving as I drive.

I might try putting the original carb on it and see, or even just rebuild it first, then put it on. I have the kit to rebuild it along with a new float.

As for the stalling, it didn't stall on me once today. It did hesitate a few times, but no stalling.

11-10-2007, 08:45 PM	#1
GMC69 Registered User Join Date: Jul 2003 Location: Sudbury, Ontario, Canada Posts: 734	Engine stalling Well after I finally got the truck on the road tonight, I discovered that when you come to a stop, then try to get going again, it wants to stall, and sometimes does. Even after warming up it has that hesitation. I tried feathering the throttle to prevent it from stalling, but that doesn't always help. I found that when I come to a stop I have to keep the rpms up a bit and it is fine. My guess would be a carb issue. But not sure where to start looking and on a side not, I also discovered that my rad leaks and will most likely have to replace it. It is a 305, carburated if that helps. __________________ Mike Email: Click here to email me -- 2019 Silvedrado 4x4 1970 Chevy 3/4 ton, 396BB, on air bags

11-10-2007, 09:26 PM	#2
Thumpin455 My truck is an alcoholic Join Date: Nov 2007 Location: Marquette Mi Posts: 303	Re: Engine stalling What carb does it have? __________________ Too much stuff, too many projects to list everything. my 454 urged 76 swb beater

11-10-2007, 09:30 PM	#3
GMC69 Registered User Join Date: Jul 2003 Location: Sudbury, Ontario, Canada Posts: 734	Re: Engine stalling Quadrajet. I have one on from a friend, and I think I will put the old one back on that came with the truck, since it was the water in the old tank that was causing issues back when I bought it. I replaced the tank and it's fresh gas, plus I emptied the carb of any water back when I did the tank. So right now I have 3 quadrajet carbs here. the original one, one from a friend ( on the truck now), and one from the wrecking yard. __________________ Mike Email: Click here to email me -- 2019 Silvedrado 4x4 1970 Chevy 3/4 ton, 396BB, on air bags

11-10-2007, 09:41 PM	#4
spudz Registered User Join Date: Oct 2005 Location: Branchville SC Posts: 1,647	Re: Engine stalling no vac leaks?? spray carb cleaner in isolated areas with the engine running, if the idle changes.. your leaking.. ALSO WEAR EYE PROTECTION! Also is your timming on? vac advance work? __________________ 2004 z71, 96 z71 on 38s, 88 Chevy k5 blazer, 4in lift. 84 swb project, 82 SWB project , 84 chevy 4x4 lwb project, 88 Jimmy beater/highschool ride. 79 c30. 99 tahoe 4x4 project. and a bunch of parts trucks..

11-11-2007, 10:25 AM	#5
chev74 Addicted to Chevy Join Date: Dec 2004 Location: Tyler, Tx Posts: 857	Re: Engine stalling what recent changes have you made besides the carb?- even though it sounds like a carb thing. i had put a Holley 750 on my 350 and it would want to die too, found out it was dumping WAY too much gas in, so i had to change the jets. Anyone know if all quadrajets came with the same size jets?

11-11-2007, 12:57 PM	#6
xtreme80 Wishin' I had more money! Join Date: Feb 2007 Location: Eugene, OR Posts: 1,242	Re: Engine stalling Your carb is leaking gas into the engine. I would find it very hard to believe that a Q-Jet could be rich enough to dump too much gas. I'd bet good money that it's dumping too much gas because of a leaky carb, and that's what's causing both your hesitation and the stalling.

11-11-2007, 03:44 PM	#7
mhicks Registered User Join Date: Jan 2004 Location: Weatherford,Tx Posts: 747	Re: Engine stalling Timing......

11-11-2007, 04:16 PM	#8
bowtier Nobody rides free Join Date: May 2005 Location: PA Posts: 1,076	Re: Engine stalling New fuel filter on it? __________________ '71 C10 LWB 400SB/350TH '86 K2O LWB 350SB/400TH-6" tuff country lift, Shackle flip - plow truck '06 HHR - wifes wheels '01 Blazer - daily driver "It's better to burn out than it is to rust." -Neil Young

11-11-2007, 04:54 PM	#9
chev74 Addicted to Chevy Join Date: Dec 2004 Location: Tyler, Tx Posts: 857	Re: Engine stalling advance?

11-11-2007, 05:35 PM	#10
GMC69 Registered User Join Date: Jul 2003 Location: Sudbury, Ontario, Canada Posts: 734	Re: Engine stalling Filter is new. It could be a leaky carb. I find it pretty hard on gas also. mind you I am used car, but still. I don't drive that far to work ( 10 mins) and I can almost see the gauge moving as I drive. I might try putting the original carb on it and see, or even just rebuild it first, then put it on. I have the kit to rebuild it along with a new float. As for the stalling, it didn't stall on me once today. It did hesitate a few times, but no stalling. __________________ Mike Email: Click here to email me -- 2019 Silvedrado 4x4 1970 Chevy 3/4 ton, 396BB, on air bags

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