crappy idle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

srv8800 · 01-10-2006, 06:02 PM

sometimes when it's cold (60*) outside my truck will idle weird. it will start up fine and idle good for a minute or so then all of a sudden the idle drops to around 400 rpm. after a while it will just die. it will do this til the truck is at normal operating temp. not a degree below. i'm assuming the cold idle is set too low but that doesn't explain why it doesn't do it right off. if it is the cold idle, how do you adjust the cold idle on a stock 2bbl carb on a 307. thanks alot

ChevLoRay · 01-10-2006, 07:02 PM

Check your choke pull-off. It may not be working right and could cause such a problem. If it has to be warmed up to run, the pull-off may be letting the choke open up, which could cause it to run poorly until it is warmed up.

Also, if the choke is not set properly, it may not be working like you want it to do.

Which carburetor are you running on your engine?

Where in Texas?

70rs/ss · 01-10-2006, 08:34 PM

Cold, huh it was 3 degrees here! I'd like some of the 60 degree cold here, I might have to pull out my shorts! Yeah, it just sounds like the idle (choke is not staying on long enough). Good luck!

srv8800 · 01-10-2006, 11:39 PM

yes.. 60* is cold here. i'll check out the choke deal tomorrow. thanks for the help. i'm in sw houston.

srv8800 · 01-11-2006, 06:01 PM

how do you adjust the choke? thanks alot

srv8800 · 01-11-2006, 08:40 PM

nvm, i got it figured out. the spring in the choke thermostat was dead. thanks

01-10-2006, 06:02 PM	#1
srv8800 Registered User Join Date: Oct 2005 Location: Texas Posts: 22	crappy idle sometimes when it's cold (60*) outside my truck will idle weird. it will start up fine and idle good for a minute or so then all of a sudden the idle drops to around 400 rpm. after a while it will just die. it will do this til the truck is at normal operating temp. not a degree below. i'm assuming the cold idle is set too low but that doesn't explain why it doesn't do it right off. if it is the cold idle, how do you adjust the cold idle on a stock 2bbl carb on a 307. thanks alot __________________ '72 lwb pickup daily driver

01-10-2006, 07:02 PM	#2
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: crappy idle Check your choke pull-off. It may not be working right and could cause such a problem. If it has to be warmed up to run, the pull-off may be letting the choke open up, which could cause it to run poorly until it is warmed up. Also, if the choke is not set properly, it may not be working like you want it to do. Which carburetor are you running on your engine? Where in Texas? __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. Last edited by ChevLoRay; 01-10-2006 at 07:04 PM.

01-10-2006, 08:34 PM	#3
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,271	Re: crappy idle Cold, huh it was 3 degrees here! I'd like some of the 60 degree cold here, I might have to pull out my shorts! Yeah, it just sounds like the idle (choke is not staying on long enough). Good luck!

01-10-2006, 11:39 PM	#4
srv8800 Registered User Join Date: Oct 2005 Location: Texas Posts: 22	Re: crappy idle yes.. 60* is cold here. i'll check out the choke deal tomorrow. thanks for the help. i'm in sw houston. __________________ '72 lwb pickup daily driver

01-11-2006, 06:01 PM	#5
srv8800 Registered User Join Date: Oct 2005 Location: Texas Posts: 22	Re: crappy idle how do you adjust the choke? thanks alot __________________ '72 lwb pickup daily driver

01-11-2006, 08:40 PM	#6
srv8800 Registered User Join Date: Oct 2005 Location: Texas Posts: 22	Re: crappy idle nvm, i got it figured out. the spring in the choke thermostat was dead. thanks __________________ '72 lwb pickup daily driver



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