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  adjusting carb problems!!

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Author Topic:   adjusting carb problems!!
rjs68stang
Journeyman

Posts: 27
From: South Bend, Indiana
Registered: Feb 2006

posted 05-14-2006 03:27 PM     Click Here to See the Profile for rjs68stang   Click Here to Email rjs68stang     Edit/Delete Message   Reply w/Quote
Hey everyone,
Something I'm not that familiar with are carburators!
I have a 68 coupe w/ 289 2v autolite 2100 carb.
It is idling high after it gets hot and is hard to stop when braking. I think that the gas mixture is off because I have tried to adjust the idle and it almost dies with just the slightest adjustment of idle speed.

It idles high after its been driven and when I go to stop. Then, if i put it in parks, it idles so high that when i put it in gear, it really slams into gear which cant be good on the car.

Can anyone give me some help on adjusting this carb??
Thanks ahead of time!!

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Scott H
Gearhead

Posts: 1106
From: Chicago area
Registered: Mar 2005

posted 05-14-2006 03:39 PM     Click Here to See the Profile for Scott H   Click Here to Email Scott H     Edit/Delete Message   Reply w/Quote
I would first look at the the choke linkage maybe hanging up and keeping the throttle linkage at high idle.

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Aussie XAXB
Journeyman

Posts: 49
From: North Olmsted, Ohio
Registered: Jan 2006

posted 05-15-2006 05:13 PM     Click Here to See the Profile for Aussie XAXB   Click Here to Email Aussie XAXB     Edit/Delete Message   Reply w/Quote
After checking to see that your fast idle linkage and slow idle linkage are not interfered with and also that your choke is openning all the way properly you can adjust your idle mixture with a vacuum gauge. Hook it up to a manifold vacuum source and adjust each (presuming 2 idle screws) idle screw 1/4 turn at a time and watch the affect on vacuum. Adjust each screw the same amount. You want the engine to produce as much vacuum as possible. Once you reach that adjustment you are done.

Afterwards try re-adjusting your idle speed and then set timing again. You may have to tweak your idle speed again after resetting timing.

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