and should idle @ 12-1400 rpm's for warmup
engine warm up
Thread Starter
Intermediate
Joined: Dec 2005
Posts: 33
Likes: 0
From: Waukesha Wisconsin
engine warm up
hey probably a stupid ? but when you warm your cars up do you have to kick it down to make it idle lower after running a while or dose it kick down automatically and dose it usally idle high at first 73 L-48 carb was rebuilt full frame off just a ? thanks
Drifting
Joined: Mar 2005
Posts: 1,806
Likes: 3
From: Burlington WI
Originally Posted by jrl1973vette
yeah mine will idle really high for a long time i almost am afraid to let it go sometimes becuse it seems like it is never going to kick down
Its hard to see but there is a screw on it for adjustment.
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
the high idle cam will reset itself when the car is warm and you step onthe gas....if yours is not doing this try cleaning the linkage and see it the choke setting is correct
Burning Brakes
Joined: Aug 2005
Posts: 1,126
Likes: 0
From: Hudson Falls, N.Y. 76 Vette Modified L-48
Originally Posted by jrl1973vette
hey probably a stupid ? but when you warm your cars up do you have to kick it down to make it idle lower after running a while or dose it kick down automatically and dose it usally idle high at first 73 L-48 carb was rebuilt full frame off just a ? thanks
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Drifting
Joined: Nov 2002
Posts: 1,665
Likes: 1
From: Ontario
If you only have to 'kick it down' once (after the engine is warmed up) then its just your choke. If you find you are kicking it down at every stoplight it may be something else...
Sometimes what can happen on older carbs is they get worn in the primary throttle plate shaft holes in the carb base plate. The throttle plates end up being just slightly twisted so they don't close all the way UNLESS you hit the gas pedal and take your foot off real fast. This makes the plates move closed fast, with enough momentum to close all the way.
To verify this is the problem take your throttle return springs off and see how nicely the throttle plates close by hand. Compare with the springs back on. If your throttle plate shaft holes are worn the plates will 'bind' due to the pulling of the springs.
The most common fix for this is to have a carb repair guy install bushings in the baseplate to firm up the shaft.
corvettefaq qjet info links
Sometimes what can happen on older carbs is they get worn in the primary throttle plate shaft holes in the carb base plate. The throttle plates end up being just slightly twisted so they don't close all the way UNLESS you hit the gas pedal and take your foot off real fast. This makes the plates move closed fast, with enough momentum to close all the way.
To verify this is the problem take your throttle return springs off and see how nicely the throttle plates close by hand. Compare with the springs back on. If your throttle plate shaft holes are worn the plates will 'bind' due to the pulling of the springs.
The most common fix for this is to have a carb repair guy install bushings in the baseplate to firm up the shaft.
corvettefaq qjet info links
Last edited by Boofers; Jan 17, 2006 at 10:46 AM.
