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 SYSTEMTESTINGSYSTEM SPARK TEST
1982 Porsche 928 Automatic Trans
System Spark Test
1982 Porsche 928 Automatic TransSECTION System Spark Test
NOTE:
Do not perform this test on Mercedes-Benz vehicles. Use an oscilloscope to check spark results on Mercedes-Benz.
- If starter turns but engine will not start or if engine fails to develop sufficient power), hold distributor end of coil wire about 3/8" (10 mm) from engine block. Crank engine. See Fig 1.
Do not use this test on Mercedes-Benz models.
- If spark jumps gap, check distributor cap, rotor, cables and spark plugs. Be sure ignition timing and fuel system are OK. If no sparks occur, perform the following tests.
RENDER: 1.0x
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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.