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 Control
- Connect vacuum tester with "Y" fitting to EGR valve. Check vacuum values and position of vacuum control flap. Vacuum values should be zero in. Hg at 700 RPM when vacuum control flap is not activated.
- With vacuum control flap fully activated, vacuum values should be (8-12 in. Hg at 1200 RPM). If test is not okay, check vacuum supply and individual components. If test is okay, test is complete.
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.