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.
1985 Porsche 928 AutomaticFACTORY OEM SERVICE PROCEDURE
Checking Load Sensor
- Connect adjustable timing light or TDC sensor system to engine. Set tester to 4-cylinder scale. Accelerate engine to 4000 RPM.
- Ignition timing should be 42° BTDC. Pull off vacuum hose on EZF control unit. Ignition timing should be 20° BTDC.
- If ignition timing of 40° BTDC cannot be reached, build up approximately 7.25 in. Hg vacuum directly to control unit with a vacuum pump. If there's no change in ignition timing, replace EZF control unit. If ignition timing changes, check vacuum line to intake air distributor 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.