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
LH Temperature Sensor II
- Connect ohmmeter on terminal 2 and ground of disconnected LH unit plug. Readings should be the same as in TEST 5. If values are not reached, repeat test directly on sensor. DO NOT connect ohmmeter across both contact lugs. Check each plug individually against ground (2 independent temperature sensors).NOTE: Temperature sensor II provides the LH control unit with information on the engine temperature. It provides a richer mixture for cold starting and warming up.
- If there's an open circuit with a reading of infinite ohms, engine will have an excessively rich mixture. Engine will stop and cannot be started again. If circuit is grounded out with a zero ohm reading, engine will be too lean. There will be no change when engine is at operating temperature.
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.