Carb woes, help
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Senior User
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Carb woes, help
Got a new carb fitted but the mechanic is a generalist not a specialist. Now it bogs down on accelaration at any speed. For a non techie like me, is there anything ican try? 1979 2wd auto.
Laughing Gas
Joined: Dec 2007
Posts: 796
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From: Minnesota
You could try adjusting the accelerator pump so it comes on sooner or later. On my 750 holley its two nuts to adjust. Either it is getting too much fuel or not enough. Unless your timing isn't correct or you vacuum advance isn't working correctly
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And in english for the non techie?!!??
Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
Assuming it ran OK before the new carb, it should be pretty easy to setup. Also assuming the replacement carb is the right size. Did Mr. Generalist pick out the new carb?
In fact that's part of the job, did this person charge you money? If they did, you should maybe ask for a refund or at least kick them in the nuts, if they didn't set it up.
First thing, is make sure the nuts (speaking of) securing the carburetor aren't too tight. Read the instructions that came with the carb. Also make sure that the mechanical linkage is not binding, this is important. Have an assistant press the pedal down while you watch down the throat of the carb. When the pedal is floored, the butterflies should be perfectly vertical. Follow the instructions for adjusting the "pump shot". This will cause flat spots or bogging if weak.
Have a fire extinguisher handy while checking and setting the float level. This is a critical adjustment as well. Finally adjust the idle mixture "lean drop" and idle RPM. Go for a beer.
In fact that's part of the job, did this person charge you money? If they did, you should maybe ask for a refund or at least kick them in the nuts, if they didn't set it up.
First thing, is make sure the nuts (speaking of) securing the carburetor aren't too tight. Read the instructions that came with the carb. Also make sure that the mechanical linkage is not binding, this is important. Have an assistant press the pedal down while you watch down the throat of the carb. When the pedal is floored, the butterflies should be perfectly vertical. Follow the instructions for adjusting the "pump shot". This will cause flat spots or bogging if weak.
Have a fire extinguisher handy while checking and setting the float level. This is a critical adjustment as well. Finally adjust the idle mixture "lean drop" and idle RPM. Go for a beer.
Hotshot
Joined: Feb 2004
Posts: 10,847
Likes: 2,615
From: The Shenandoah Valley
Either find (and maybe even pay) someone to diagnose and either repair or simply adjust it ..... or go to the Library o Amazon or Books A Million and get some book learning on whatever kind of carb you have. Basic theory is similar, but the mechanical aspects differ slightly. Holley uses power valves and diaphragm accelerator pumps to fatten mixtures for acceeration, Edelbrock uses step up springs, metering rods, and a plunger accelerator pump.
I've got books on carbs I've had since I was 16 when I did my fist rebuild and was reading /absorbing what I could about cars .... and a bunch more gathered since then .... and the number is now reversed. Not to say it'll take that long (it doesn't.
You might have some trash in the carb, maybe a defective accelerator pump, a missing check ball spring someplace, or maybe just maladjusted linkage.
I've got books on carbs I've had since I was 16 when I did my fist rebuild and was reading /absorbing what I could about cars .... and a bunch more gathered since then .... and the number is now reversed. Not to say it'll take that long (it doesn't.
You might have some trash in the carb, maybe a defective accelerator pump, a missing check ball spring someplace, or maybe just maladjusted linkage.
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Thanks everyone, I dont think its a holley but I have no idea to be honest. I'll start reading up and get some self education.
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Elder User
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You can post a picture and someone can identify it I assumed it was a motor craft for what it's worth
I agree with the fire extinguisher there's a big black spot on the hood above my carburetor
I agree with the fire extinguisher there's a big black spot on the hood above my carburetor
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Ok, its actually a Oreilly parts special TMC 2-889. I just fitted new wheels and tires and the guy at the shop says its the float, based on my descn of it bogging down when the accelerator is pressed.
Hopefully get it to a knowledgable chap soon to fix.
Hopefully get it to a knowledgable chap soon to fix.
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Spoke to a ford truck guru who says its probably the jets so I'll change these first
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Bogging down, hesitating, stumbling from a dead stop or when accelerating at speed is indicative of a defective accelerator pump (9B559) and check valve (9576).
351W is Econoline related. 351M/400 use a similar carb.
Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
I was gonna say, you might want to find another guru. Guess everyone here is wasting their time trying to help?
It's your money, but with all the wonderful web pages and YouTube videos, downloadable .pdf manuals and such (including FTE) there isn't any reason to pay anyone to do this simple stuff, although if I recall correctly you paid someone to install the carb and then had trouble.
Then somebody else told you it's the float. Now yet another guru says it's jetting. Jetting should have been part of the installation anyway. You should at least listen to the advice given here, or try to fake it anyway. Good luck.
It's your money, but with all the wonderful web pages and YouTube videos, downloadable .pdf manuals and such (including FTE) there isn't any reason to pay anyone to do this simple stuff, although if I recall correctly you paid someone to install the carb and then had trouble.
Then somebody else told you it's the float. Now yet another guru says it's jetting. Jetting should have been part of the installation anyway. You should at least listen to the advice given here, or try to fake it anyway. Good luck.
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Senior User
Joined: Jul 2015
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I was gonna say, you might want to find another guru. Guess everyone here is wasting their time trying to help?
It's your money, but with all the wonderful web pages and YouTube videos, downloadable .pdf manuals and such (including FTE) there isn't any reason to pay anyone to do this simple stuff, although if I recall correctly you paid someone to install the carb and then had trouble.
Then somebody else told you it's the float. Now yet another guru says it's jetting. Jetting should have been part of the installation anyway. You should at least listen to the advice given here, or try to fake it anyway. Good luck.
It's your money, but with all the wonderful web pages and YouTube videos, downloadable .pdf manuals and such (including FTE) there isn't any reason to pay anyone to do this simple stuff, although if I recall correctly you paid someone to install the carb and then had trouble.
Then somebody else told you it's the float. Now yet another guru says it's jetting. Jetting should have been part of the installation anyway. You should at least listen to the advice given here, or try to fake it anyway. Good luck.
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