The Ford Barn

wa4ko · 07-07-2010, 09:39 AM

Bought a 55 Bird that has a 302 in it and was barely running, and not idling at all.
Compression is good all around, First I removed all vacuum lines and blocked them, replaced the pcv valve. All plugs look good.
Replaced fuel pump 7 lbs pressure and good flow, Rebuilt the Motorcraft 2150 ( 108 ) carb with 48 jets, Replaced the entire ignition system, distributor, coil, wires. drained and replaced the gas.
Start the car with the choke closed runs great, knock it down one notch still runs great 19 inches of vacuum solid. After about 5 minutes the choke starts to open and it starts fluttering and missing, if I hold the choke almost closed it will run great, but when it opens it will not keep running. I took the carb apart again, all clean and open. Nothing I have done has changed the problem at all?? It does not seem to be getting enough fuel to the idle setup in the carb, the screws start at 1 1/2 out and tried from 0 to 4 turns only slight changes. Don't want to buy a carb if I do not need it but do you have any other ideas I missed??
Larry

wa4ko · 07-07-2010, 12:45 PM

I think I found the problem, the throttle shaft is loose and sucking in air.
I will let you know if this does not work out
Larry

fbcoach68 · 07-12-2010, 02:13 PM

Did the throttle shaft fix the problem?

Frank The Plumber · 07-12-2010, 04:16 PM

7 psi fuel pressure is too high, you should back it down to 5, or even 4.5, did your carb have screens on the opposite side of the float needle valves? When you were settings the mixture screws were you watching your vac ? What did the vac do when the choke opened? Can you rag the shaft to get a seal?

wa4ko · 07-23-2010, 03:00 PM

OK Guys
I determined the problem was with the carb leaking air around the throttle shaft
and traded it for a rebuilt carb. Guess I was right, purring like a kitten now no
problems left. Just wanted all to know and thanks
Larry

Marshall57 · 12-01-2017, 01:50 PM

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where would you attach the vac gauge when setting the idle mixture screws?
Thanks.

KULTULZ · 12-01-2017, 02:09 PM

Quote:

Originally Posted by wa4ko

Bought a 55 Bird that has a 302 in it and was barely running, and not idling at all.

Start the car with the choke closed runs great, knock it down one notch still runs great 19 inches of vacuum solid. After about 5 minutes the choke starts to open and it starts fluttering and missing, if I hold the choke almost closed it will run great, but when it opens it will not keep running.

Larry

Running Too lean and you found the cause.

Quote:

Originally Posted by Marshall57

where would you attach the vac gauge when setting the idle mixture screws?

Thanks.

To any full manifold vacuum outlet. The vacuum gauge reading would have informed you of a too lean condition from the start.

dmsfrr · 12-02-2017, 02:17 PM

Quote:

Originally Posted by KULTULZ

Running Too lean and you found the cause.

To any full manifold vacuum outlet. The vacuum gauge reading would have informed you of a too lean condition from the start.

KULTULZ...

Marshall57 asked a new question on a resurrected old post by someone else, that originally ended 07-23-2010.

.

KULTULZ · 12-02-2017, 07:00 PM

Quote:

Originally Posted by dmsfrr

KULTULZ...

Marshall57 asked a new question on a resurrected old post by someone else, that originally ended 07-23-2010.

Just trying to help the guy.

Why aren't old posts archived?

07-07-2010, 09:39 AM	#1
wa4ko Member Join Date: May 2010 Location: Okeechobee, FL Posts: 41	Help carb problem Bought a 55 Bird that has a 302 in it and was barely running, and not idling at all. Compression is good all around, First I removed all vacuum lines and blocked them, replaced the pcv valve. All plugs look good. Replaced fuel pump 7 lbs pressure and good flow, Rebuilt the Motorcraft 2150 ( 108 ) carb with 48 jets, Replaced the entire ignition system, distributor, coil, wires. drained and replaced the gas. Start the car with the choke closed runs great, knock it down one notch still runs great 19 inches of vacuum solid. After about 5 minutes the choke starts to open and it starts fluttering and missing, if I hold the choke almost closed it will run great, but when it opens it will not keep running. I took the carb apart again, all clean and open. Nothing I have done has changed the problem at all?? It does not seem to be getting enough fuel to the idle setup in the carb, the screws start at 1 1/2 out and tried from 0 to 4 turns only slight changes. Don't want to buy a carb if I do not need it but do you have any other ideas I missed?? Larry

07-07-2010, 12:45 PM	#2
wa4ko Member Join Date: May 2010 Location: Okeechobee, FL Posts: 41	Re: Help carb problem I think I found the problem, the throttle shaft is loose and sucking in air. I will let you know if this does not work out Larry

07-12-2010, 02:13 PM	#3
fbcoach68 Member Join Date: Jun 2010 Location: SOCAL Posts: 35	Re: Help carb problem Did the throttle shaft fix the problem?

07-12-2010, 04:16 PM	#4
Frank The Plumber Senior Member Join Date: May 2010 Posts: 693	Re: Help carb problem 7 psi fuel pressure is too high, you should back it down to 5, or even 4.5, did your carb have screens on the opposite side of the float needle valves? When you were settings the mixture screws were you watching your vac ? What did the vac do when the choke opened? Can you rag the shaft to get a seal?

07-23-2010, 03:00 PM	#5
wa4ko Member Join Date: May 2010 Location: Okeechobee, FL Posts: 41	Re: Help carb problem OK Guys I determined the problem was with the carb leaking air around the throttle shaft and traded it for a rebuilt carb. Guess I was right, purring like a kitten now no problems left. Just wanted all to know and thanks Larry

12-01-2017, 01:50 PM	#6
Marshall57 Senior Member Join Date: Jul 2011 Location: Elko Nevada Posts: 217	Re: Help carb problem Sponsored Links (Register now to hide all advertisements) where would you attach the vac gauge when setting the idle mixture screws? Thanks.