LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mercedes Benz >> 1987 >> 560SL >> Repair and Diagnosis >> Engine Performance >> System >> EGR System >> Testing - Gasoline System >> Vacuum Amplifier
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Vacuum Amplifier

  1. Connect vacuum tester to White-Slate/Brown vacuum line with "Y" connector. Run engine at 1500 RPM. Vacuum should be less than 2.7 in. Hg. If vacuum is zero or more than 10 in. Hg ensure that vacuum lines are connected correctly to the throttle valve housing.
  2. Increase engine speed to 3200 RPM. Vacuum should be greater than 10 in. Hg. Decrease engine speed to below 3000 RPM. Vacuum should drop. If vacuum does not drop replace vacuum amplifier.
  3. If vacuum is not 10 in. Hg at 3200 RPM, connect vacuum tester to White-Slate/Blue vacuum line at vacuum amplifier. Increase engine speed slowly to 1500 RPM. If vacuum is less than 2.7 in. Hg, increase engine speed to 3200 RPM. If vacuum drops to 10 in. Hg replace amplifier.
scientia non olet · About LEMON Manuals