idle speed

74CHEVYC20 · 05-22-2006, 11:16 PM

i have a c20 and i just rebuilt a 283 to put in it. my problem is that the engine seems to run fine during idle in park, but when i put the truck into gear the engine drops in rpms and sounds like it wants to die. if i shift it back into park the rpms jump back up to normal. also when i drive it slowly it does alright, but if i mash the gas it hesistates and seems to make a popping sound inside the carb, and sometimes dies. i have messed with the fuel mixture on the carb and i checked all vacuums. im running out of things to check, any ideas would be great. thanks

chevyguy · 05-23-2006, 10:45 AM

First timing is if it is popping thru the carb. Set the timing correctly. Second why are you messing with the fuel air screws? Are you using a vacuum gauge to tune it? if not then your just guessing . Set the timing and then set the fuel air scres back to the highest vacuum you can get out of it and it will probally run like a top.

74CHEVYC20 · 05-23-2006, 12:22 PM

i know this sounds stupid, but where is the best place to hook up the vacuum gauge and how can i tell if i might have a intake manifold or other leak? i also cant seem to adjust the timing correctly, i am using a timing light. the engine seems to idle too high. what is the best way to get correct timing.

chevyguy · 05-23-2006, 04:05 PM

Correct timing by turning the distribuitor with the vacuum advance disconnected.Best place to hook up a vacuum gauge is a nonj essential vacuum port. Something that goes to a non essential place with constant vacuum. Adjust idle with idle screws not with fuel/air mix screws.

05-22-2006, 11:16 PM	#1
74CHEVYC20 Junior Member Join Date: Feb 2006 Posts: 4	idle speed i have a c20 and i just rebuilt a 283 to put in it. my problem is that the engine seems to run fine during idle in park, but when i put the truck into gear the engine drops in rpms and sounds like it wants to die. if i shift it back into park the rpms jump back up to normal. also when i drive it slowly it does alright, but if i mash the gas it hesistates and seems to make a popping sound inside the carb, and sometimes dies. i have messed with the fuel mixture on the carb and i checked all vacuums. im running out of things to check, any ideas would be great. thanks

05-23-2006, 10:45 AM	#2
chevyguy Senior Member Join Date: Sep 2005 Location: ALABAMA Posts: 3,370	First timing is if it is popping thru the carb. Set the timing correctly. Second why are you messing with the fuel air screws? Are you using a vacuum gauge to tune it? if not then your just guessing . Set the timing and then set the fuel air scres back to the highest vacuum you can get out of it and it will probally run like a top. __________________ Friends dont let friends use body lifts USMC 92-96 USCG 98 to present

05-23-2006, 04:05 PM	#4
chevyguy Senior Member Join Date: Sep 2005 Location: ALABAMA Posts: 3,370	Correct timing by turning the distribuitor with the vacuum advance disconnected.Best place to hook up a vacuum gauge is a nonj essential vacuum port. Something that goes to a non essential place with constant vacuum. Adjust idle with idle screws not with fuel/air mix screws. __________________ Friends dont let friends use body lifts USMC 92-96 USCG 98 to present

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
1987 Silverado 350 TBI Auto., hard start, won't idle	87Silverado	Chevy Truck Forum	8	07-08-2007 07:20 PM
3 speed automatic to 5 speed manual help	torino	Ford Truck Forum	12	02-25-2006 06:17 PM
Speed Channel Truck Stop: Bill Lester (Speed TV)	trucknews	Truck News (headlines)	0	07-20-2005 01:30 PM
SPEED Channel Continues to be the Exclusive Home of the NASCAR Craftsman Truck Series (Speed TV)	trucknews	Truck News (headlines)	0	01-25-2005 09:30 PM
ASA Speed Truck Challenge Renewed for 2005 (Speed TV)	trucknews	Truck News (headlines)	0	12-15-2004 03:30 PM

05-23-2006, 12:22 PM	#3
74CHEVYC20 Junior Member Join Date: Feb 2006 Posts: 4	i know this sounds stupid, but where is the best place to hook up the vacuum gauge and how can i tell if i might have a intake manifold or other leak? i also cant seem to adjust the timing correctly, i am using a timing light. the engine seems to idle too high. what is the best way to get correct timing.