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Occasional rough running and part indentity question... 200 1984

posted by  brickbear240 on  Sun Mar 20 17:02 CST 2011
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last visit: Thu May 8 14:40 CST 2014
[RELATED]

IAC motor sticks on occasion even after cleaning so needs to be replaced. What is the correct part number for the late 84 B23F with 3 wire Oxygen Sensor? 501 or 520? Also there is a little black box on the firewall with the word UP and an arrow on it, also an adjustment knob on the top. It has a blue/red wire going to the harness and a black wire grounded to the firewall. Any idea what it does?
--
Harold Thompson '84 245 Virgos






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