Fast Idle Adjustment
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 1,089
Likes: 43
From: Native Californian CALIFORNIA
Army
Fast Idle Adjustment
I have a rochester carburetor 69 stock on a 350/300 and adjusted the fast idle to specifications and now my curb idle has increased by 300 rpm's. Are the two related? Should the curb idle be affected by the fast idle adjustment?
Racer
Joined: Mar 2006
Posts: 366
Likes: 1
From: Houston Texas
It should not be, but it is possible.
If the fast idle was set on the wrong choke cam lobe, you could see this effect. I also wait until my engine is completely warmed up before making the fast idle adjustment. My fast idle will climb 200-400 rpm between the initial start and start +2 minutes. The choke flap should probably be set in the 'cold start' position while making the adjustment too as it also changes the a/f mixture.
Lots of papers here:
http://wiki.corvettefaq.com/index.php?title=Engine
If the fast idle was set on the wrong choke cam lobe, you could see this effect. I also wait until my engine is completely warmed up before making the fast idle adjustment. My fast idle will climb 200-400 rpm between the initial start and start +2 minutes. The choke flap should probably be set in the 'cold start' position while making the adjustment too as it also changes the a/f mixture.
Lots of papers here:
http://wiki.corvettefaq.com/index.php?title=Engine
