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Adjusting the DME in 1985 1/2 944

Electrical

Vehicle Information: Year: 1985; Engine (type, size, modifications): headers, intake, europarts chip, konis, weltmeister springs/sway bars; Total Mileage: 143000;

Since I've put a chip and headers in the car, it seems to run lean. One of my local mechanics told me to adjust the computer module by the small triangular shaped switch on the side of the box. I have a screw driver I shaved down to adjust it but i don't know which place on the switch is '1' and what each click means. Does it retards the timing or fuel or what? How can I tell where I am, and what does each click mean?

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