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.
1979 BMW 528i Automatic TransFACTORY OEM SERVICE PROCEDURE
Diverter Valve
- Check all hoses to diverter valve for cracks, bends or improper routing. Repair or replace hoses as necessary. Pull vacuum hose from diverter valve. With engine running, vacuum must be felt at end of hose.
- Reattach hose to diverter valve. At idle, no air should be coming from diverter valve atmospheric outlet. Open and close throttle quickly. Air should escape from atmospheric outlet for 1-3 seconds. If not, diverter valve is defective.
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.