Note. If the pressure disk of the air mass meter is above the specified level, backfires occur during misfiring. With the low position of the pressure disk, it is difficult to start both a cold and a hot engine.
Check the centering of the pressure disk by inserting a feeler gauge 0.10 mm in succession at four points along the circumference. Adjust engine idle. When adjusting, it is forbidden to bend the leaf spring of the disc stop. Connect the air supply hood to the air flow meter.
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