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DANIEL TINDER
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Rough running/exhaust popping/hard starting after warmup, plus bubbling sound from carb area (eventually dies down, but returns upon throttle fully opened). Starts & runs normally when cold though. Carb mod has power valve continuously open, btw. Ideas?
6 VOLTS/POS. GRD. NW INDIANA
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Robs36Ford
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Sounds like lean, Check fuel pump for weak pressure or flow .... ?
1936 Ford 3W Coupe : 56 T-Bird 312, 47 Packard 3 speed, 40 juice brakes.
1968 Merc Cyclone FB GT 390, Getting a better front clip!
1977 Ford F-250 Supercab RWD Explorer Long box.
1976 Chev Camaro RS LT
Future rebuild : 1949 Ford F-1
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Ted
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The vacuum for the power valve on the model 4000 Holley is independent of the spark advance valve. The power valve is the brass valve between the main jets in the fuel bowl while the spark advance valve is located on the side of the carburetor. What carb modification are you referring to? Are the idle mixture screws responsive? Screwing them all the way shuts off the engine? One to one and half turns out on each is normal for a stock camshaft. Any vacuum leaks will upset the idle and cause the popping noise you mention.
  Lorena, Texas (South of Waco)
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DANIEL TINDER
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Robs36Ford (8/25/2025)
Sounds like lean, Check fuel pump for weak pressure or flow .... ? No change when I switch on the electric auxiliary pump.
6 VOLTS/POS. GRD. NW INDIANA
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DANIEL TINDER
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Ted (8/25/2025)
The vacuum for the power valve on the model 4000 Holley is independent of the spark advance valve. The power valve is the brass valve between the main jets in the fuel bowl while the spark advance valve is located on the side of the carburetor. What carb modification are you referring to? Are the idle mixture screws responsive? Screwing them all the way shuts off the engine? One to one and half turns out on each is normal for a stock camshaft. Any vacuum leaks will upset the idle and cause the popping noise you mention. Carb mod: Oversized AC stud attached to the float cover (threads in body stripped), but not sealed, thus no vacuum to close the power valve. Normal running when cold, and bubbling noise from carb area (returning when throttle floored) after warm shutdown is what’s puzzling.
6 VOLTS/POS. GRD. NW INDIANA
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Ted
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Looks like we are back to the engine running lean when it’s hot. You might try disconnecting the distributor vacuum line and see if that helps. Beyond that, then low carburetor float level, vacuum leak(s), idle mixture screws improperly set, valve lash, ignition timing are just a few other things to look at.
Lorena, Texas (South of Waco)
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paul2748
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Sounds like you need another carb. Shouldn't be that hard to locate another 55 teapot DANIEL TINDER (8/26/2025)
Carb mod: Oversized AC stud attached to the float cover (threads in body stripped), but not sealed, thus no vacuum to close the power valve. Normal running when cold, and bubbling noise from carb area (returning when throttle floored) after warm shutdown is what’s puzzling. [/quote]
54 Victoria 312; 48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ
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DANIEL TINDER
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paul2748 (8/26/2025)
Sounds like you need another carb. Shouldn't be that hard to locate another 55 teapot.
I’ll likely just finally install the modern Holley I have put aside, and leave the teapot issue to whatever restorer ends up with my car 😁 (after I check the possibilities that shouldn’t only occur when engine warms, or causes a bubbling sound).
P.S. I wonder, if anyone has filled the market void left when PONY went out of business? Seems like most current rebuilders lack that same level of tech sophistication.
6 VOLTS/POS. GRD. NW INDIANA
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DANIEL TINDER
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My quoted post text disappeared (go figure).
Was just curious if anybody has filled the market void left when PONY went out of business? (Same level of tech sophistication).
6 VOLTS/POS. GRD. NW INDIANA
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paul2748
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Are you looking for a rebuilder for your teapot ? These guys specialize in teapots: Sal Cicala 586-612-1650 David Arey 610-837-6146 DANIEL TINDER (8/27/2025)
My quoted post text disappeared (go figure). Was just curious if anybody has filled the market void left when PONY went out of business? (Same level of tech sophistication).
54 Victoria 312; 48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ
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