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.
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HOMESERVICE MANUALSPORSCHE1982928 AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCEIGNITION SYSTEMBOSCH ELECTRONIC IGNITION SYSTEMTESTINGFINAL CONTROL MODULE OR IGNITION COIL CHECK
1982 Porsche 928 Automatic Trans
Final Control Module Or Ignition Coil Check
1982 Porsche 928 Automatic TransSECTION Final Control Module Or Ignition Coil Check
NOTE:
This test does not apply to Mercedes-Benz vehicles.
- If ignition coil is suspected of being defective, substitute a known good coil, and attempt to start vehicle. If it starts, reinstall old coil and start vehicle.
- If it then fails to start, replace with new coil. If control module is suspected, substitute a known good module, and start vehicle. If it starts, reinstall original module. If vehicle fails to start now, install new control module.
- If system still fails to operate, disconnect tachometer connector at instrument cluster. Attempt to start engine. If engine now starts, replace tachometer.
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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.