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Author
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Topic: Carburetor swap
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clipper25usa
Journeyman Posts: 43
From: Lake Stevens, Washington
Registered: Apr 2004
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posted 04-12-2004 05:26 PM
 
I have the Autolight 4300 on a 302 that I can't seem to get operating corectly. The engine dies or almost dies just coming off of idle. It also leaks at the forward lip by the fuel filter. I'm thinking of going to a holley 4150 with the vacuum secondaries/600 cfm/electric choke. I'm open for sugestions. Thanks!
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SteveLaRiviere
Administrator Posts: 48752
From: Saco, Maine
Registered: May 99
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posted 04-12-2004 06:43 PM
Autolite 4300 carbs are famous for being hard to get running right. A Holley or an Autolite 4100 would be a great improvement.------------------
'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
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clipper25usa
Journeyman Posts: 43
From: Lake Stevens, Washington
Registered: Apr 2004
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posted 04-13-2004 09:29 AM
Thanks Steve, I rebuilt the 4300 autolite once and it didn't help much. I'm just looking for a trouble free setup as posible. I do not have any plans to do too many modifications to the car. Thanks again, Scott
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 04-13-2004 09:43 AM
4300 Autolites like to eat accelerator pumps.
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Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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clipper25usa
Journeyman Posts: 43
From: Lake Stevens, Washington
Registered: Apr 2004
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posted 04-16-2004 10:33 AM
I'm installing a holley hly-0-80457s elec choke and vacuume secondarys from the autolite 4300. Engine 302 with the C4 transmition. (1)The 3/8 od power brake or PVC vacuum port on the carb: Should this be caped since my power brakes are pulling air off the intake manifold? (2)The full manifold vacuum port: do I reconnect the exhust manifold line to this? (3) I bought the holley P/N 20-91 spring and perch kit: I installed the part but what do I hook up to it and how do I adjust the kickdown screw for proper operation? I'm trying to find the proceedure in the factory manual with no luck so far. (4) what is a good source for switched 12v for the electric choke?
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Stang72
Gearhead Posts: 326
From: Arkel,Zuid-Holland,Holland
Registered: Jan 2003
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posted 04-16-2004 11:23 AM
Hi Clipper,i have the same carb as you have, only my experience where these, the carb is running excelent now, no thanx to Hollet but to the guys on this forum, they helped me through it!!
https://mustangsandmore.com/ubb/Forum12/HTML/005491.html
https://mustangsandmore.com/ubb/Forum12/HTML/007281.html this is not to discourage you, it's working fine now ,but if it's not , you'll know where to look  greetz Ben
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