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.
1992 Porsche 911 AmericaFACTORY OEM SERVICE PROCEDURE
Testing Precautions
- ALWAYS turn ignition switch off, or disconnect battery for resistance tests. ALWAYS disconnect the engine speed/reference sensor for compression tests. If this is not done, dangerous high voltages and insulation damage to the following components may result: ignition coil, high-voltage distributor and ignition leads.
- NEVER connect a capacitor to ignition coil terminals. NEVER connect ignition coil terminal No. 1 to ground. The ignition coil and DME control unit could be damaged.
- NEVER connect battery leads or test light to ignition coil terminal No. 1. The DME control unit will be damaged. NEVER disconnect ignition lead from ignition coil secondary terminal during engine operation.
- Voltage flashover from ignition coil secondary terminal to ignition coil primary coil terminals (No. 1 and 15) must be avoided. The DME control unit could be damaged.
- When testing, the secondary circuit of the 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 switch off or disconnect battery BEFORE disconnecting ignition or DME control unit connectors. Electrostatic discharge may damage DME control unit.
- NEVER 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).
NOTE:
Complete system and component testing information is not available from manufacturer. Only components with informations available are covered in this article.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.