Vacuum Control

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Connect vacuum tester (116 589 25 21 00) with "Y" fitting to EGR valve. Check vacuum values and position of vacuum control flap. Vacuum values are: At 750 RPM, 0 in. Hg; at 1200 RPM, 4-9 in. Hg; at 3000 RPM, 0 in. Hg. If vacuum test values are OK, go to next test. If vacuum test values are not OK, check vacuum supply and individual components.