The Ford Barn

Old Redneck · 04-18-2020, 12:24 PM

I got my 56 Thunderbird running today. I know the engine is a57 and I though the carb was a 2 barrel being so small but it a 4 barrel. The idle is very fast and how do I adjust the darn thing.It a Holly, can you show me where the adjustments are? Sure hope so.I put some MMO in the oil and gas tank. With the automatic choke I am lost. THE ENGINE IS RUNNING WAY TO FAST.

39deluxecp · 04-18-2020, 06:57 PM

If the choke is not opening all the way, it may be stuck on high idle cam

paul2748 · 04-18-2020, 07:40 PM

If it's a Teapot carb, the idle adjustment screw is on the left side of the carb. Screwdriver slot facing toward the rear.

scicala · 04-19-2020, 10:37 AM

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If the choke isn't opened all the way, or the fast idle cam is sticking and not dropping down, then it's probably idling fast off of the fast idle cam n the passenger's side of the carb. (A 2nd speed screw for fast idle when on the choke only).

Sal

04-18-2020, 12:24 PM	#1
Old Redneck Senior Member Join Date: May 2010 Location: Waynesburg,Pa. Posts: 1,909	How to adjust a HOLLY 4 BARREL CARB I got my 56 Thunderbird running today. I know the engine is a57 and I though the carb was a 2 barrel being so small but it a 4 barrel. The idle is very fast and how do I adjust the darn thing.It a Holly, can you show me where the adjustments are? Sure hope so.I put some MMO in the oil and gas tank. With the automatic choke I am lost. THE ENGINE IS RUNNING WAY TO FAST.

04-18-2020, 06:57 PM	#2
39deluxecp Senior Member Join Date: Oct 2015 Location: s/w Iowa Posts: 111	Re: How to adjust a HOLLY 4 BARREL CARB If the choke is not opening all the way, it may be stuck on high idle cam

04-18-2020, 07:40 PM	#3
paul2748 Senior Member Join Date: May 2010 Location: Midland Park, NJ Posts: 3,979	Re: How to adjust a HOLLY 4 BARREL CARB If it's a Teapot carb, the idle adjustment screw is on the left side of the carb. Screwdriver slot facing toward the rear. __________________ 48 Ford Conv 56 Tbird 54 Ford Victoria

04-19-2020, 10:37 AM	#4
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,698	Re: How to adjust a HOLLY 4 BARREL CARB Sponsored Links (Register now to hide all advertisements) If the choke isn't opened all the way, or the fast idle cam is sticking and not dropping down, then it's probably idling fast off of the fast idle cam n the passenger's side of the carb. (A 2nd speed screw for fast idle when on the choke only). Sal