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
Temperature Sensor I Test
- Connect ohmmeter to terminals No. 10 and 22 of EZF ignition control unit connector. Ohmmeter reading should be 4400-6600 ohms at 32°F (0°C), 1400-3600 ohms at 60-85°F (15-30°C), or 1000-1300 ohms at 105°F (40°C).
- Temperature sensor protective circuit is activated if ignition timing equals -3 degrees and temperature sensor circuit is either open or shorted to ground.
- Ignition timing will also equal -3 degrees if intake air temperature is more than 122°F (50°C), engine is at full throttle, and intake manifold pressure more than 19 in. Hg.
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.