Warm up the engine with a drive. Disconnect the oxygen sensor(s) if equiped.

With the engine idling, turn the adjustment in the lean direction in small amounts, like a quarter turn at a time, and wait for a minute between each turn in order to let the engine settle in to the new adjustment. Typically on Bosch injection, "inward" is rich and "outward" is lean.

Continue making these minor adjustments until you just hear the subtle lean misfire in the exhaust note....you may also hear/see the engine begin to miss slightlly. At this point, you've found the "too lean" spot. Stop adjusting.

Now turn the mixture screw back "in" in smaller increments, waiting between each movement, until you just notice the miss go away. Stop. That's rich enough.

If the engine already has a lean misfire, then it's probably too lean already, so instead of doing this proceedure by heading toward "too lean" first, start off by heading toward "too rich" until you find the point where the engine suddenly runs really nice....then come back lean until you get the misfire, and then go back in the smaller increments until you're at that first good idle spot.

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