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Jul 21st, 2025 | | | | Joined: Jan 2020 Posts: 620 'Bolter | | 'Bolter Joined: Jan 2020 Posts: 620 | I'm fully aware of the the old adage "if one keeps trying over and over again and one gets the same results, your stupid" or something like that. I just hate to go back into a B carb on my 54-235. I took extra care and it's so pretty. So many of you have said I have a accelerator problem. It is still running rich and soot's up a new set of AC-R45's in about 20 minutes. The engine has 28'000 miles on it with great compression. The carb does not leak or shoot out fuel when running. I can't get it to idle, runs fine at 900 + rpm but with black exhaust. I'm going to order some of Bob G's capacitors and thinking of running AC-46 plugs for about 200 miles. You would expect more from an educated engine nut but alas I'm letting my education hold me back. I mean I started working with my dad and older brother with greasy engines when I was 6. Too stubborn. ed
Currently making 1954 3100 better than new and Genetics
| | | | | Joined: Jan 2001 Posts: 5,320 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,320 | Are you sure the vacuum port on the bottom of the carburetor is not being blocked by the base gasket?
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Dec 2008 Posts: 1,915 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 1,915 | one gets the same results, your stupid
Or, if at first you don't succeed try, try again
Your power circuit is on line. | | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | For a temporary test, try blocking the power piston into the lean(up) position. There's a few ways to accomplish that without doing any permanent modifications. If the plug fouling stops, then find the vacuum loss or other reason the plunger is staying down all the time. Plug fouling that bad can't be corrected with hotter plugs.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | What you are describing is what happens when a hole appears in the accelerator pump diaphragm on a Carter YF2100 (I know, nothing like looking at an apple to find out what's wrong with an orange).
I am not familiar enough with the Model B to know if a faulty accelerator pump circuit will also cause your issue.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Jan 2001 Posts: 5,320 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,320 | It’s almost always the power valve system on a “B” that is the problem.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | There is a channel that goes across the top of the airhorn on a model B carb. It has a small plug in one end that sometimes gets blown out when you do an o-haul. If that plug is missing you will get these symtoms.
George
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Dec 2018 Posts: 2,451 'Bolter | | 'Bolter Joined: Dec 2018 Posts: 2,451 | Doc Hall Listen to wrenchbender,he is right,plug is in the floor there somewhere ! | | |
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