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Old 05-14-2017, 01:19 PM
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Default Engine Stalling

Was hoping to get some help with this one.

All of a sudden yesterday my 79 started running pretty rough at the stop light. Then today is stalled completely at a stop light. Happened over and over again when I started it in the parking lot and when I let it idle it would cough until it died. It would not start unless I was pushing on the gas pedal.

Once I'm on the pedal at all speeds it runs fine, no issues. We checked the carb when I started it and it was dry. It wasn't squirting fuel until I pushed on the gas pedal.

What could be causing the issue? Fuel pump? Carb? Throttle? It's a stock goodwrench 350 with a 4 barrel. This is my first chevy so I'm not too familiar with it yet. Any advice would be awesome as it is my daily driver.
I'm going to try and clean it up because the car was sitting when I bought it and it has more spider webs on the carb than I've ever seen.
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  #2  
Old 05-14-2017, 02:23 PM
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welcome Ben

did you check for vacuum leaks yet??
check all the vacuum hoses??
maybe a EGR vacuum leak??

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Old 05-14-2017, 08:41 PM
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Quote:
Originally Posted by JJLT1 View Post
welcome Ben

did you check for vacuum leaks yet??
check all the vacuum hoses??
maybe a EGR vacuum leak??

I have not yet. The mechanics where I work said the carb wasnt getting fuel until I pressed the pedal. Which hoses are those on the motor? What would I be looking for?
I'm still learning how to work on cars, brakes and suspension I can do but motor work, I have a lot to learn
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Old 05-14-2017, 09:06 PM
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Hi Ben, welcome from Idaho. You might check your carbs accelerator pump.
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Old 05-14-2017, 09:27 PM
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the vacuum hoses are all the small black rubber hoses connected to the carb
and other things on the intake..
if they leak it wont want to idle.. look for cracks, leaks, missing hoses on open ports...

could be the idle mixture circuits are dirty

normally you wont see fuel till you hit the accelerator and the accelerator pump squirts,
it should idle without that.. sounds like its working tho..

what kind of carb is it??
what kind of mechanics are they??

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Old 05-15-2017, 12:57 PM
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Quote:
Originally Posted by JJLT1 View Post
the vacuum hoses are all the small black rubber hoses connected to the carb
and other things on the intake..
if they leak it wont want to idle.. look for cracks, leaks, missing hoses on open ports...

could be the idle mixture circuits are dirty

normally you wont see fuel till you hit the accelerator and the accelerator pump squirts,
it should idle without that.. sounds like its working tho..

what kind of carb is it??
what kind of mechanics are they??

I'm not sure what kind of carb it is. Like I said I'm still getting familiar with the car. I'll check the hoses and everything and see if I can visually see anything. I gave it a good cleaning with just some carb cleaner. It helped a little, but I still have to rev it up to keep it from stalling at stop lights. I haven't done anything to the motor aside from an oil change and air filter.
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Old 05-15-2017, 04:51 PM
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bend the small hoses over/double, if they crack or split
replace them all, ONE AT A TIME, dont mix them up..

could be a carb choke problem too?? maybe??

does it look like this
http://www.carbkitsource.com/carbs/p...7040200lfq.jpg
or
http://www.carbkitsource.com/carbs/p...H4150G-534.jpg
or
http://www.carbkitsource.com/carbs/p...anti-3588S.jpg

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Old 05-15-2017, 07:59 PM
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I would check the idling jets at the base of the carb. Unscrew them all the way out. Use a straight pin and check the jet opening. Leaking vacuum lines is also a good possibility, but you noted it accelerated ok. That would state your acceleration pump is ok, just starving at idle. Assuming the choke is open, look down the throats if the primaries are slightly open. It could be as simple as a dirty fuel filter. Hard to say without looking at it. The first carb shown is a Rochester Quadrajet - a real challenge to overhaul. I would suggest an expert. The second is a Holly, a more reliable card and easier to adjust. The third, I am not familiar with. Good luck


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Old 05-15-2017, 10:29 PM
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So the carb is definitely the first one, the Quadrajet. The carb was absolutely filthy, most of it was obscured by the spider webs. Cleaning made a difference, it's no dying. But still stumbling a lot. My day off is tomorrow so I'll be going through all the hoses and I'll look for those idling jets. Where would the fuel filter be located, it took two of us looking for it and couldn't find it.
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Old 05-15-2017, 10:51 PM
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fuel filter is inside the big fuel inlet nut,
but if it runs good at mid/full throttle, the filter wont usually keep it from idleing..

there idle mixture screws
check everything else before you start turning screws, IF you dont know how to adjust it right...

can you tell if the carb is rich or lean??
any black smoke out the tail pipe??
what do the sparkplugs look like??

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Old 05-16-2017, 07:02 AM
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Don't touch the carb. 90% OF THE TIME IT'S SOMETHING ELSE. Turning the idle mixture screws will only cause you problems at this point.
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Old 05-16-2017, 02:43 PM
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Quote:
Originally Posted by HKDUP87 View Post
Don't touch the carb. 90% OF THE TIME IT'S SOMETHING ELSE. Turning the idle mixture screws will only cause you problems at this point.
So what else could it be? Should I adjust the idle?
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Old 05-16-2017, 02:46 PM
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Quote:
Originally Posted by Meta79 View Post
So what else could it be? Should I adjust the idle?
Do you have a vacuum gauge and a tach? It's great when you can tune by ear but numbers will be more accurate.
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Old 05-16-2017, 03:22 PM
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I've got it now where as long as I'm pressing the gas pedal it'll run. As soon as I take my foot off the pedal it cuts out. The top butterfly (I guess the choke) is really loose and I can't see where anything is able to move it. Also I noticed there is about an inch of play in the accelerator cable.
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Old 05-16-2017, 04:28 PM
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vacuum leak will do that..

can you post a pic of the choke and cable??

put the pics in the Garage,, goto USERCP/garage,, easy to upload there...

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