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 StandardFACTORY OEM SERVICE PROCEDURE
Test 5 - Temperature Sensor I
- Connect ohmmeter to terminals No. 10 and 22 on EZF ignition control unit plug. Readings should be as follows:
- At 32°F (0°C) equals 4.4 to 6.8 k/ohms.
- At 60-85°F (15-30°C) equals 1.4 to 3.6 k/ohms.
- At 105°F (40°C) equals 1 to 1.3 k/ohms.
- For protective circuit, temperature sensor break (open circuit) and short circuit (grounded) equals ignition timing of -3°. Intake air temperature 122°F (50°C) equals ignition timing of -3°. These readings are with closed full throttle contact and 25 in. Hg vacuum.
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.