INNOVATE DLG1 Wideband O2 Oxygen Sensor Tuning Diagnostics Logging Air Fuel Ratio etc

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Originally Posted by Gregski

now when I started to go on my test run, my truck was idling at 13.5 AFR by the time I came back from the test drive it richened back down to 12.5 (???)

I recall reading somewhere that the Idle Mixture screws should be somewhere between 1/2 a turn and no more than 4 turns out, so I was approaching that lower limit of 1/2 a turn to lean it out, but before messing with the Idle Air Bleeds (which I am not even sure I can replace on my carb to be honest whichu) I decided to remove the carb and use my EyeCrometer to inspect the transfer slots (something you can't see with the carb on the truck)

My dad would drill holes in the primary butterfly's to adjust idle speed, to keep the transfer slot correct.