holley question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

misfits · 05-19-2002, 10:29 AM

Does anyone know what would cause a holley no to go strait to fast idle when the engine is started cold. Everything works fine and is adjusted right. The choke closes and the fast idle cam goes up when the choke is set, the choke opens properly but when the engine is started it starts at 1000 to 1400 RPMs and slowly rises to fast idle it usually takes about 3 or 4 minutes on a warm day. Also the fast idle cam is new and I put new gaskets in the carb recently.

misfits · 05-19-2002, 10:29 AM

Also its a 4160 model.

*Zkast* · 05-19-2002, 10:34 AM

There is a adjustment screw mounted on the throttle shaft on the choke side of the carb. Its a pain to get to, but this is what you will need to adjust if indeed your choke fast idle cam is moving up.

Look between the vacuum secondary pod and the choke housing, open the throttle all the way and you will see the lever attached to the shaft. There will be the adjusting screw. Screw it in to raise the idle speed.

------------------
Pictures and more...
piston@zkast.com
'71 LWB
350/350T, PS/PB
Special options? Yes, RUST... Need some?
------------------------------------------
Webmaster/Team owner
www.zkast.com
Garrett - Olathe, Kansas

misfits · 05-19-2002, 10:37 AM

The idle speed is set fine but it wont go to fast idle when it is started. I'm positive the fast idle cam set right too.

misfits · 05-19-2002, 10:40 AM

As the engine warms up it slowly rises to 1800 RPMs. I'm trying to figure out why it does that.

*Zkast* · 05-19-2002, 10:44 AM

Verify that your engine is running good before adjusting anything on the idle speed....

Sounds like its running rich or lean (need more info)if it is hitting 1800 eventually. Can you lower the cam lever and lower the idle?

------------------
Pictures and more...
piston@zkast.com
'71 LWB
350/350T, PS/PB
Special options? Yes, RUST... Need some?
------------------------------------------
Webmaster/Team owner
www.zkast.com
Garrett - Olathe, Kansas

misfits · 05-19-2002, 10:51 AM

I think its a little rich. Yes the cam lever can be lowered. its not stuck or anything. I had the engine rebuilt a few months ago so its not the engine. Its been doing this for over a year now. It worked when i put the carb on but started doing that a couple months later. its very bad in winter, it won't stay running and wants to start at about 400 or 500 RPMs.

misfits · 05-19-2002, 10:54 AM

After it gets to fast idle you can bring the idle speed down to normal idle and it works fine after that.

*Zkast* · 05-19-2002, 11:04 AM

When you start the engine (cold) pull the air cleaner off and verify that you have aprox 1/4 of gap(or slightly less) in the choke air valve. If the choke pull-off (located inside teh choke housing) isnt getting vacuum or is damaged, it will cause it to run very rich. If this is the case, try opening the valve with your finger or use a pencil and see if your rpm doesnt raise immediatly

------------------
Pictures and more...
piston@zkast.com
'71 LWB
350/350T, PS/PB
Special options? Yes, RUST... Need some?
------------------------------------------
Webmaster/Team owner
www.zkast.com
Garrett - Olathe, Kansas

misfits · 05-19-2002, 11:20 AM

The choke is opening about 1/4". It dosen't raise the idle if it is opened more than that.

*Zkast* · 05-19-2002, 11:31 AM

Start with the basics:
Make sure base timing is good
verify no vacuum leaks

Sounds like the choke is working like it should, its only an indicator of another problem. If the things I mentioned above are ok and you know for 100% there are no vacuum leaks, there is an internal problem inside the carb (plugged air bleed) causing it to run bad when cold.

Did you also try to close the air valve just a bit to see if it would raise the idel?
Tough to diagnose running problems through a keyboard LOL.

------------------
Pictures and more...
piston@zkast.com
'71 LWB
350/350T, PS/PB
Special options? Yes, RUST... Need some?
------------------------------------------
Webmaster/Team owner
www.zkast.com
Garrett - Olathe, Kansas

O'l Buck · 05-19-2002, 12:02 PM

maybe the float level is a little high and it's running over into the venturies??...I don't know much about holleys.

------------------
"In the words of Motley Crue, This will always be my home sweet home"

Ol' Buck: '72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84
ralleys and 31/10.5s

Angel girl: 67 Cutlass convertible
330, 3spd stick

Greener: 90 GMC Jimmy
350/auto
Chad Stephens
Orleans,NE

no name yet: 72 442 under serious construction
my site:
http://communities.msn.com/Beastonabudget/homepage

mark25 · 05-19-2002, 08:03 PM

make the Holley into a door stop and buy an Edelbrock, problem solved!!

misfits · 05-20-2002, 03:07 PM

I was thinking about using it as a boat anchor. LOL.

Blazer1970 · 05-20-2002, 03:37 PM

That is normal for cold weather. That is what fast idle is for. It just plain takes a lot more fuel to keep the engine running when it is cold.

------------------
Tim

05-19-2002, 10:29 AM	#1
misfits Registered User Join Date: Feb 2001 Location: Sturgeon Bay , WI USA Posts: 375	holley question Does anyone know what would cause a holley no to go strait to fast idle when the engine is started cold. Everything works fine and is adjusted right. The choke closes and the fast idle cam goes up when the choke is set, the choke opens properly but when the engine is started it starts at 1000 to 1400 RPMs and slowly rises to fast idle it usually takes about 3 or 4 minutes on a warm day. Also the fast idle cam is new and I put new gaskets in the carb recently.

05-19-2002, 12:02 PM	#12
O'l Buck Recovering Truck Driver Join Date: Mar 2002 Location: Orleans, NE USA Posts: 1,883	maybe the float level is a little high and it's running over into the venturies??...I don't know much about holleys. ------------------ "In the words of Motley Crue, This will always be my home sweet home" Ol' Buck: '72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84 ralleys and 31/10.5s Angel girl: 67 Cutlass convertible 330, 3spd stick Greener: 90 GMC Jimmy 350/auto Chad Stephens Orleans,NE no name yet: 72 442 under serious construction my site: http://communities.msn.com/Beastonabudget/homepage __________________ 67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska

05-19-2002, 08:03 PM	#13
mark25 Registered User Join Date: Feb 2000 Location: Vassar,Ks 66543 Posts: 375	make the Holley into a door stop and buy an Edelbrock, problem solved!! __________________ '72 C-10 Cheyenne Super, 402/TH400, Bucket Seats, tilt, tach, AM/FM & shoulder harnesses and a ground up restoration

05-20-2002, 03:37 PM	#15
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	That is normal for cold weather. That is what fast idle is for. It just plain takes a lot more fuel to keep the engine running when it is cold. ------------------ Tim __________________ Tim

05-19-2002, 10:34 AM	#3
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	There is a adjustment screw mounted on the throttle shaft on the choke side of the carb. Its a pain to get to, but this is what you will need to adjust if indeed your choke fast idle cam is moving up. Look between the vacuum secondary pod and the choke housing, open the throttle all the way and you will see the lever attached to the shaft. There will be the adjusting screw. Screw it in to raise the idle speed. ------------------ Pictures and more... piston@zkast.com '71 LWB 350/350T, PS/PB Special options? Yes, RUST... Need some? ------------------------------------------ Webmaster/Team owner www.zkast.com Garrett - Olathe, Kansas

05-19-2002, 10:37 AM	#4
misfits Registered User Join Date: Feb 2001 Location: Sturgeon Bay , WI USA Posts: 375	The idle speed is set fine but it wont go to fast idle when it is started. I'm positive the fast idle cam set right too.

05-19-2002, 10:40 AM	#5
misfits Registered User Join Date: Feb 2001 Location: Sturgeon Bay , WI USA Posts: 375	As the engine warms up it slowly rises to 1800 RPMs. I'm trying to figure out why it does that.

05-19-2002, 10:44 AM	#6
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	Verify that your engine is running good before adjusting anything on the idle speed.... Sounds like its running rich or lean (need more info)if it is hitting 1800 eventually. Can you lower the cam lever and lower the idle? ------------------ Pictures and more... piston@zkast.com '71 LWB 350/350T, PS/PB Special options? Yes, RUST... Need some? ------------------------------------------ Webmaster/Team owner www.zkast.com Garrett - Olathe, Kansas

05-19-2002, 10:51 AM	#7
misfits Registered User Join Date: Feb 2001 Location: Sturgeon Bay , WI USA Posts: 375	I think its a little rich. Yes the cam lever can be lowered. its not stuck or anything. I had the engine rebuilt a few months ago so its not the engine. Its been doing this for over a year now. It worked when i put the carb on but started doing that a couple months later. its very bad in winter, it won't stay running and wants to start at about 400 or 500 RPMs.

05-19-2002, 10:54 AM	#8
misfits Registered User Join Date: Feb 2001 Location: Sturgeon Bay , WI USA Posts: 375	After it gets to fast idle you can bring the idle speed down to normal idle and it works fine after that.

05-19-2002, 11:04 AM	#9
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	When you start the engine (cold) pull the air cleaner off and verify that you have aprox 1/4 of gap(or slightly less) in the choke air valve. If the choke pull-off (located inside teh choke housing) isnt getting vacuum or is damaged, it will cause it to run very rich. If this is the case, try opening the valve with your finger or use a pencil and see if your rpm doesnt raise immediatly ------------------ Pictures and more... piston@zkast.com '71 LWB 350/350T, PS/PB Special options? Yes, RUST... Need some? ------------------------------------------ Webmaster/Team owner www.zkast.com Garrett - Olathe, Kansas

05-19-2002, 11:20 AM	#10
misfits Registered User Join Date: Feb 2001 Location: Sturgeon Bay , WI USA Posts: 375	The choke is opening about 1/4". It dosen't raise the idle if it is opened more than that.

05-19-2002, 11:31 AM	#11
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	Start with the basics: Make sure base timing is good verify no vacuum leaks Sounds like the choke is working like it should, its only an indicator of another problem. If the things I mentioned above are ok and you know for 100% there are no vacuum leaks, there is an internal problem inside the carb (plugged air bleed) causing it to run bad when cold. Did you also try to close the air valve just a bit to see if it would raise the idel? Tough to diagnose running problems through a keyboard LOL. ------------------ Pictures and more... piston@zkast.com '71 LWB 350/350T, PS/PB Special options? Yes, RUST... Need some? ------------------------------------------ Webmaster/Team owner www.zkast.com Garrett - Olathe, Kansas

05-20-2002, 03:07 PM	#14
misfits Registered User Join Date: Feb 2001 Location: Sturgeon Bay , WI USA Posts: 375	I was thinking about using it as a boat anchor. LOL.



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