196 Running Rich

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   I recently purchased a 1963 AMC rambler with a 196 l6 engine. The carburetor on the car is a Carter 1520. The problem that I am having is that the car is running rich. You can see the black smoke out of the exhaust. Also when changing the oil there was gas in the oil.

What I have done
I have changed the spark plugs. The old ones were black
I did a compression test on the cylinders. 5 of the cylinders got up to 130-140 and held. The last cylinder only made it to 120 and held. 

Are there any adjustments on the carb or engine that I can make to help the car from running so rich? Thank you in advance. 

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Ramb1963 Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Fan Joined: Feb/05/2023 Location: USA Status: Offline Points: 10	Post Options Post Reply Quote Ramb1963 Report Post Thanks(0) Quote Reply Topic: 196 Running Rich Posted: Feb/05/2023 at 9:37pm
	I recently purchased a 1963 AMC rambler with a 196 l6 engine. The carburetor on the car is a Carter 1520. The problem that I am having is that the car is running rich. You can see the black smoke out of the exhaust. Also when changing the oil there was gas in the oil. What I have done I have changed the spark plugs. The old ones were black I did a compression test on the cylinders. 5 of the cylinders got up to 130-140 and held. The last cylinder only made it to 120 and held. Are there any adjustments on the carb or engine that I can make to help the car from running so rich? Thank you in advance.

Trader Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6884	Post Options Post Reply Quote Trader Report Post Thanks(0) Quote Reply Posted: Feb/06/2023 at 5:19am
	There could be so many things on that old of carburetor that could be wrong, from stuck butterfly valves, bad float, poor adjustment, dirt, seized parts or damaged parts. You should get the TSM for the vehicle. Would also suggest getting a rebuild kit and rebuilding the carburetor - the only way of finding out what's really wrong with it and likely by now more then one thing. If not your comfort level to rebuild the carburetor, replace it as they are still readily available. The carburetor should come with basic adjustment procedures but the TSM will have procedures specific to the car.