Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1988 Mercedes Benz 560SLFACTORY OEM SERVICE PROCEDURE
Vacuum Amplifier
- 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 throttle valve housing.
- 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.
- 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 vacuum amplifier.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.