idle
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Junior User
Joined: Jul 2001
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idle
Ok i've got a question for all of you. My idle while in park is perfect but when I shift in to drive there is barely enought idle to keep it alive, so my question is how do I raise the idle in drive but not in park? The carb is a motorcraft 2100 sitting on top of a stock 390.
Posting Guru
Joined: Jun 1999
Posts: 2,415
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From: Comox Valley, Canada
idle
I always thought that you set the idle while the truck is in gear, of course you need help doing this 
What is the idle in rpm in park and drive on your truck now?? Is it possible for the torque converter to drag down the engine in idle by not "freewheeling" enough??
Sparky
What is the idle in rpm in park and drive on your truck now?? Is it possible for the torque converter to drag down the engine in idle by not "freewheeling" enough??
Sparky
Moderator
Joined: Jan 2001
Posts: 56,965
Likes: 2,725
From: Virginia
idle
I usually have this problem when I try to run the vacuum advance on the distributor on manifold vacuum. While it is idling, pull the hose off the dist and see if you have vacuum. If you do, find the port on the carb that has vacuum only when you rev the engine. This will help the flare up in rpm you are experiencing.
Now, there is a chance that you have the vacuum line hooked to the correct port, and you can't find a port that doesn't have vacuum at idle. If this is the case, you have other problems. If all the ports have vacuum at idle, the idle screw on the carb is turned in too much. It is probably turned in too much to keep the truck running because:
A vacuum leak somewhere
timing is retarded
egr is leaking
probably some other stuff I can't think of.
Now, there is a chance that you have the vacuum line hooked to the correct port, and you can't find a port that doesn't have vacuum at idle. If this is the case, you have other problems. If all the ports have vacuum at idle, the idle screw on the carb is turned in too much. It is probably turned in too much to keep the truck running because:
A vacuum leak somewhere
timing is retarded
egr is leaking
probably some other stuff I can't think of.
