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.
1987 Porsche 928 AutomaticFACTORY OEM SERVICE PROCEDURE
Load Sensor Test
- Connect timing light to engine. Start engine and increase speed to 4000 RPM. Ignition timing should be 37-43 degrees BTDC. If setting cannot be reached, apply vacuum to ignition control unit until it does.
- Disconnect vacuum hose from EZF ignition control unit. Ignition timing should change to 17-23 degrees BTDC. If timing does not change, replace ignition control unit. If timing changes, check vacuum hose or intake manifold for leaks.
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.