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Joined: Jun 2003
Posts: 20
Grease Monkey
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OP
Grease Monkey
Joined: Jun 2003
Posts: 20 |
Hi,
I've been experiencing hesitation and spitting through the caburetor. Also, had a problem with starting after driving approximately 40 miles.
Any suggestions would be greatly appreciated.
Thanks,
Woody
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
Hi woodeemail, Sounds like the accelerator pump circuit is stopped up. 
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Jun 2003
Posts: 20
Grease Monkey
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OP
Grease Monkey
Joined: Jun 2003
Posts: 20 |
Hi Ray,
Not sure what you mean by "stopped up". What do you suggest?
Woody
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
Popping is most often due to a lean fuel mixture. It can be the accelerator pump but with problems starting likely due to intake leak, reduced fuel flow (vapor formation in fuel pump), vaporizing fuel in carb bowl or other problem getting enough fuel through carb to mix with air.
How Sweet the roar of a Chevy four!
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
Hi woodeemail, When you depress the accelerator pedal quickly, the carburetor squirts a shot of raw gas into the throat and directly into the intake manifold. This shot of gas covers the transition period of the change in the setting of the throttle plate. If the engine doesn't get this shot of raw gas it will stumble (starve) for sufficient gas for that short period of time. You can check the operation of the accelerator pump by removing the air cleaner; with a flashlight look directly into the throat of the carburetor as you give the lever a quick turn. You should see raw gas injected into the carburetor throat. If not, you may have a restricted circuit in the carburetor that prevents this action from taking place. The remedy, is a complete disassembly of the carburetor and thorough cleaning and perhaps, the installation of a new carburetor kit. (It would be helpful if we had some of the history of the problem. Has it just appeared recently, an ongoing problem, now and then, or? What action finally resulted in starting of the engine, ect.)
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Jun 2003
Posts: 20
Grease Monkey
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OP
Grease Monkey
Joined: Jun 2003
Posts: 20 |
Hi guys,
In the way of history, I did rebuild the carburetor over the winter when I re-did my engine compartment. After getting it running again, I did have problem with accelerator pump, but disassembled it again, checked everything, and thought I had the problem solved. It seemed to be starting ok, but I had the hesitation, and thought I could get through the next month of shows/etc., before working on it again. Unfortunately, it didn't want to start after driving to a show yesterday (about 40 miles). I checked starting, after I got home at the end of the day, and it started right up. I still had the hesitation and spitting,on the way home.
Thanks again for your time.
Woody
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Joined: Jan 2002
Posts: 85
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Jan 2002
Posts: 85 |
Check for a vaccuum leak and check the valve lash.
'40 - 1/2 ton , daily driver. ![[Linked Image from i60.tinypic.com]](http://i60.tinypic.com/15cy620.jpg)
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