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Author Topic:   Manual Choke Adjustment
rockafellz
Gearhead

Posts: 1291
From: San Lorenzo, CA, USA
Registered: Aug 2001

posted 11-21-2002 02:52 PM     Click Here to See the Profile for rockafellz   Click Here to Email rockafellz     Edit/Delete Message   Reply w/Quote
Hey Fellas,

On the new motor i've got a rebuilt 1850-2 600CFM Holley and when I start her cold (choke open), I have to hold the accelerator pedal at 1500-2000rpm until warm before I can let the pedal go or it stalls. When it's warm it idles in park at 1000-1100 and 700-900 in drive.

When I try starting it with the choke closed, it doesn't start at all, so what I did was adjust the choke screw that adjusts the butterflies/accelerator rod when the choke is closed. I closed the choke about 90% and when I started it, it starts but sputters and smokes and idles roughly.

I don't mind holding the gas pedal for a a minute or two, but I figured since I have a manual choke, I might as well learn and try.

Any suggestions?

Thanks in advance.

Erik

------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

[This message has been edited by rockafellz (edited 11-21-2002).]

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steve'66
Gearhead

Posts: 6522
From: Sonoma,CA,USA
Registered: Mar 2000

posted 11-21-2002 06:29 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Erik,

I'd mill that choke horn right off that carb.! You don't need it in sunny California.

SteveW

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rockafellz
Gearhead

Posts: 1291
From: San Lorenzo, CA, USA
Registered: Aug 2001

posted 11-22-2002 10:36 AM     Click Here to See the Profile for rockafellz   Click Here to Email rockafellz     Edit/Delete Message   Reply w/Quote
Well, it's just that I have to hold the throttle for about 2 minutes before I can let off the pedal so it can idle on it's own. I noticed when you started your '66 it fired right up with no choke. Is the idle set high or ???

Should I open my idle/fuel mixture screws a bit more? It runs and idles fine when warm though.

Erik

------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

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SteveLaRiviere
Administrator

Posts: 33371
From: Saco, Maine
Registered: May 99

posted 11-22-2002 10:41 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Try adjusting it so when it's fully choked there's a 1/8" gap between choke plate and choke housing.

------------------
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rockafellz
Gearhead

Posts: 1291
From: San Lorenzo, CA, USA
Registered: Aug 2001

posted 11-22-2002 12:40 PM     Click Here to See the Profile for rockafellz   Click Here to Email rockafellz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by SteveLaRiviere:
Try adjusting it so when it's fully choked there's a 1/8" gap between choke plate and choke housing.


Hey SteveL, I actually don't have a choke cable installed. I open my hood to adjust the choke by hand. What i'm not sure about is how to set the throttle adjusting screw on the choke side of the carb.

Thanks again.

Erik

------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 11-22-2002 12:59 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Maybe you can get a California midget mechanic to hang out under your hood and work your choke for you when you want to drive your car.

------------------
Alex Denysenko
Co-Administrator and Moderator

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Quote #1: "I never met a magazine mechanic I liked."
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Fastymz
Moderator

Posts: 11429
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 11-22-2002 01:01 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
Maybe you can get a California midget mechanic to hang out under your hood and work your choke for you when you want to drive your car.


Is a CALIFORNIA midget a better a mechanic then an east coast midget mechanic?

SCOOP

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oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

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rockafellz
Gearhead

Posts: 1291
From: San Lorenzo, CA, USA
Registered: Aug 2001

posted 11-22-2002 01:05 PM     Click Here to See the Profile for rockafellz   Click Here to Email rockafellz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
Maybe you can get a California midget mechanic to hang out under your hood and work your choke for you when you want to drive your car.


HA HA HA, I always thought that the choke could be closed or near closed when cold then opened manually when warm.

Erik

------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

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69 Sportsroof
Gearhead

Posts: 1202
From: Valley, Alabama, USA
Registered: Mar 2002

posted 11-22-2002 02:03 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by rockafellz:
What i'm not sure about is how to set the throttle adjusting screw on the choke side of the carb.

That sounds like the fast idle screw. You need to screw it inward a turn and a half or so. The choke plate just chokes the engine air. The fast idle screw is what catches on the fast idle cam to increase the rpms.

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rockafellz
Gearhead

Posts: 1291
From: San Lorenzo, CA, USA
Registered: Aug 2001

posted 11-22-2002 02:10 PM     Click Here to See the Profile for rockafellz   Click Here to Email rockafellz     Edit/Delete Message   Reply w/Quote
Yes, that's the friggin' name of it!! The fast-idle screw!! What should the rpm be when the choke is closed? And only 1/8" gap, not fully closed right?

Erik

------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

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69 Sportsroof
Gearhead

Posts: 1202
From: Valley, Alabama, USA
Registered: Mar 2002

posted 11-22-2002 02:57 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by rockafellz:
What should the rpm be when the choke is closed? And only 1/8" gap, not fully closed right?

On the highest point of the idle cam you should be at around 1800 rpm I believe. I dont have my book with me at work so let someone correct or confirm that.

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