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.
1994 Porsche 911 Speedster, AutomaticFACTORY OEM SERVICE PROCEDURE
Testing Precautions
- Turn ignition off or disconnect battery for resistance tests. Disconnect engine speed/reference mark sensor for compression tests, otherwise, high voltages and insulation damage to ignition coil, high-voltage distributor and ignition leads may result.
- DO NOT connect a capacitor to ignition coil terminals. DO NOT connect ignition coil terminal No. 1 to ground. Ignition coil and DME control unit could be damaged.
- DO NOT connect battery leads or test light to ignition coil terminal No. 1. DME control unit will be damaged. DO NOT disconnect ignition lead from ignition coil secondary terminal during engine operation.
- Avoid voltage flashover from ignition coil secondary terminal to ignition coil primary terminals (No. 1 and 15), or DME control unit may be damaged.
- During testing, secondary circuit of ignition system must be suppressed at all times with 4000-ohm resistance (1000-ohm distributor cap suppression resistor; 3000-ohm spark plug lead suppression resistors).
- Always turn ignition off or disconnect battery before disconnecting ignition or DME control unit connectors. Electrostatic discharge may damage DME control unit.
- DO NOT disconnect battery while engine is running. Reversed battery polarity could damage ignition or DME control unit. DO NOT exceed a charging voltage of 16 volts (including when using a battery charger).
Factory Service Tools
Use the Manual With the Right Hardware
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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.