Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 184Get this manual

Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 184

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Vacuum Test Troubleshooting
This test is normally performed at an idle speedAs engine rpm increases, there will be slight increase in vacuumThe increase should not exceed specifi