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Re: Carb series ? help
[Re: terzmo]
#3059636
07/16/22 11:23 AM
07/16/22 11:23 AM
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Joined: Jan 2003
Posts: 15,311
Omaha Ne
TJP
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I Live Here
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Omaha Ne
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Did this problem just start on an existing combination? Is it an auto or stick? If an auto have you tried slipping it into neutral when coming to a stop Another issue that will commonly cause this is the mechanical advance being set too loose (IE: coming in at or just of idle) When you say RPM makes no difference does that mean it will die even at 1500 RPM? Might also have a stiffened power valve which they will do over time. A bit a leakage around the throttle shafts is normal (to a point). The hsafts normally don't wear but rather the baseplate itself. I would start by verifying the mechanical advance is not coming in to soon. might also want to check the vacuum advance as well if your running it  
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Re: Carb series ? help
[Re: terzmo]
#3059667
07/16/22 01:12 PM
07/16/22 01:12 PM
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Joined: Aug 2003
Posts: 43,127
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,127
Bend,OR USA
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looks like an early custom made, ut the choke tower off and other mods,. That looks like a early double pumper body  Measure the throttle bores and plates and post those on here so maybe SOMEONE can look them up in Holley on line spec charts   
Last edited by Cab_Burge; 07/16/22 01:13 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Carb series ? help
[Re: TJP]
#3059679
07/16/22 02:29 PM
07/16/22 02:29 PM
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Joined: Mar 2005
Posts: 2,060
Pendleton NY
terzmo
OP
top fuel
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OP
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Joined: Mar 2005
Posts: 2,060
Pendleton NY
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It's intermittent as it runs down the road fine...no change in performance..IF you rev the motor at a light a bit constantly, it wont't stall. 8 ot of 10 times it quits without warning..other 20% it seems to load up and then die. It does not give any problems ever when warming up. Only after running a medium to large distance and then quits after like idling down to find a parking space or waiting at a light. Temp gauge is always around 185 to 190 when it stalls. And again, it is not every time....just always at a bad time...lol
it's definetely a holley dual feed double pump of some model series as I need to know what series it is because I'll either get a new base plate or buy a new carb
It's an automatic and once had it idling at 1000 rpm and it died. Reving in neutral and it won't die.
Mechanical advance.
Problem just started a few weeks ago
Last edited by terzmo; 07/16/22 02:35 PM.
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Re: Carb series ? help
[Re: terzmo]
#3059692
07/16/22 03:58 PM
07/16/22 03:58 PM
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Joined: Jun 2014
Posts: 3,163
Md.
carnut68
master
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master
Joined: Jun 2014
Posts: 3,163
Md.
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It's intermittent as it runs down the road fine...no change in performance..IF you rev the motor at a light a bit constantly, it wont't stall. 8 ot of 10 times it quits without warning..other 20% it seems to load up and then die. It does not give any problems ever when warming up. Only after running a medium to large distance and then quits after like idling down to find a parking space or waiting at a light. Temp gauge is always around 185 to 190 when it stalls. And again, it is not every time....just always at a bad time...lol
it's definetely a holley dual feed double pump of some model series as I need to know what series it is because I'll either get a new base plate or buy a new carb
It's an automatic and once had it idling at 1000 rpm and it died. Reving in neutral and it won't die.
Mechanical advance.
Problem just started a few weeks ago Have you cleaned up the advance weights? Maybe they sticking just enough to effect low engine speed. Timing could be dropping too much in gear. It looks like an old 4150. Start the engine a blow some air thru the idle bleeds, see if that helps it also. Also sounds like a vacuum leak at base of carb. Might be causing to go lean at idle after it warms up.
America First!
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Re: Carb series ? help
[Re: BSB67]
#3059699
07/16/22 04:41 PM
07/16/22 04:41 PM
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Joined: Mar 2005
Posts: 2,060
Pendleton NY
terzmo
OP
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OP
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Pendleton NY
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Drive it home starts right up...Don't believe a vapor lock issue.
Blew air throughout the entire carb..including bleders. Ran gumout directly while running...disassembled carb next day and cleaned...aired...was no visible dirt
evidence of a leak at throttle shaft as with spraying there the idle gets lower but doesn't stall. BUT.. one person said some leakage is normal there...but what is the normal amount of "some" lol. I'm going to change the entire base plate assembly Monday. A friend has a spare "parts" carb. I bought the carb years ago from a friend and it's been fine until now. My friend bought it new in 1995 so I guess an issue is to be expected after 27 years.
Last edited by terzmo; 07/16/22 04:47 PM.
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Re: Carb series ? help
[Re: Cab_Burge]
#3059779
07/17/22 12:43 AM
07/17/22 12:43 AM
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Joined: Feb 2003
Posts: 10,201
Someplace you aren't
SomeCarGuy
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I Live Here
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Someplace you aren't
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looks like an early custom made, ut the choke tower off and other mods,. That looks like a early double pumper body Measure the throttle bores and plates and post those on here so maybe SOMEONE can look them up in Holley on line spec charts I agree on what it looks like. What ignition system? Sounds like when an ecu has a bad ground. Gets worse when hot. Something like a petronix will get wonky when it’s hot wire sees lower voltage when under hood temps go up. Looks like you don’t have a voltage reg hooked up. Running a one wire? Is it charging good at low rpm?
I want my fair share
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Re: Carb series ? help
[Re: SomeCarGuy]
#3059855
07/17/22 07:22 AM
07/17/22 07:22 AM
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Joined: Mar 2005
Posts: 2,060
Pendleton NY
terzmo
OP
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OP
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Pendleton NY
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electronic orange box ignition. Internal voltage reg in alternator..(108 amp) Charges normally Haven't seen any carbs of this type with a choke tower
Last edited by terzmo; 07/17/22 07:24 AM.
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Re: Carb series ? help
[Re: terzmo]
#3059871
07/17/22 10:24 AM
07/17/22 10:24 AM
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Joined: Jan 2021
Posts: 971
rust belt
Moparite
super stock
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super stock
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Posts: 971
rust belt
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look for a list #,That will tell you what carb it is, The throttle shaft is steel and the body is cast aluminum so if anything is work it will be the body not thge shaft. You will have to have it machined for bushings to fix it. ![[Linked Image]](https://images.holley.com/tech_carb_list.jpg) Not sure where they put them on the larger carbs but the list below might help some. https://documents.holley.com/techlibrary_carb_numerical_listing.pdf
Last edited by Moparite; 07/17/22 10:31 AM.
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Re: Carb series ? help
[Re: terzmo]
#3059900
07/17/22 12:23 PM
07/17/22 12:23 PM
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Joined: Jan 2003
Posts: 15,311
Omaha Ne
TJP
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I Live Here
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Omaha Ne
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Check your voltage at the battery terminal on the alt. and battery POST not cable Should be within .2-.5 V at worst. Then check V going into the ballast at idle. Should be about the same as the battery and Alt. You can also see if it V increases with RPM. try a ballast. They are cheap and can cause these symptoms when getting ready to fail Also as SCG said VERIFY the ground on the ECU. Ideally it should be grounded directly to bare metal on the ECU & motor
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Re: Carb series ? help
[Re: TJP]
#3060270
07/18/22 03:43 PM
07/18/22 03:43 PM
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Joined: Mar 2005
Posts: 2,060
Pendleton NY
terzmo
OP
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OP
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Pendleton NY
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Just for grins I ground all the paint off both sides of the box and ground off the paint on the fender. Also installed a new ballast resistor. AND of couse it's raining out so I have to wait for it to stop to do a check ride. Before doing all that I did check continuity of the box to ground and it was a direct short.
Last edited by terzmo; 07/18/22 03:44 PM.
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Re: Carb series ? help
[Re: terzmo]
#3060383
07/18/22 09:17 PM
07/18/22 09:17 PM
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Joined: Jan 2003
Posts: 15,311
Omaha Ne
TJP
I Live Here
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I Live Here
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Omaha Ne
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Just for grins I ground all the paint off both sides of the box and ground off the paint on the fender. Also installed a new ballast resistor. AND of course it's raining out so I have to wait for it to stop to do a check ride. Before doing all that I did check continuity of the box to ground and it was a direct short. just an FYI: you can measure 0 ohms resistance but the connections ability to handle Current is another thing all together. Grounds can also sometimes be intermittent and a challenge to identify. Increasing the engines RPM may raise the alternators V and current (I) output enough to mask a bad connection or ground. A small wire braid ground strap between the motor and control box is ideal. Also I have seen more than one ballast that is on it's way out cause issues like your experiencing. The resistor is breaking down internally resulting in the issue occurring. Again raising the RPM may provide enough current to "bridge" the internal resistance. Measuring them when cold may show good Ohms wise, but hot may be another reading  keep us posted
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Re: Carb series ? help
[Re: TJP]
#3060469
07/19/22 07:53 AM
07/19/22 07:53 AM
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Joined: Mar 2005
Posts: 2,060
Pendleton NY
terzmo
OP
top fuel
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OP
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Pendleton NY
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Box is grounded for sure...new resistor.....same result....more of a fuel issue I believe as it started to stall and I caught it twice by playing with the gas peddle. Seems to be loading up at idle...today I am changing the base plate as there is a leak there that noticeably affected idle. To be continued...looking at throttle shaft as that a week or so ago I noticed the shaft was very loose and tapped it beck into place..the issue of stalling was before and after tapping the shaft back in. Pretty solid but I sprayed the shaft with gumout and the idle dropped noticeably and then came back up as the liquid vaporized.
Last edited by terzmo; 07/19/22 07:56 AM.
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Re: Carb series ? help
[Re: terzmo]
#3060535
07/19/22 12:08 PM
07/19/22 12:08 PM
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Joined: Jan 2003
Posts: 15,311
Omaha Ne
TJP
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I Live Here
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Omaha Ne
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Bummer, problems like this can be challenging to diagnose  I'm assuming you are getting good response from the mixture screws when adjusting them ? if so that would indicate the idle circuit is doing it's job and functioning as well as compensating for the suspected shaft leak. I just had another thought When idling, have you tried SLOWLY restricting the air into primary side of the carb? Think of very slowly closing a door. IF you get to a point in which the idle picks up / smooths out it indicates a small vacuum leak that is otherwise not noticeable, i had one years ago that drove me nuts for a quite a bit, I finally just checked & tightened the intake bolts, MAGICALLY all was well Keep us posted
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