Ignition components testing

Ignition coil, testing

^ Primary coil resistance is measured with an ohmmeter between terminals 1 and 15.

• Measurement of secondary resistance is between terminals 4 and 15.

• Replace a coil which does not meet specifications. Correct values are in Table b.

Spark plug wires, testing

— Check resistance of each spark plug end connector as well as wire itself.

^ To test connector, use ohmmeter probe on both ends.

— Test shielded ends of coil and spark plug wires at distributor cap and coil using same method.

To avoid damaging the distributor cap, do not wiggle the connectors when removing the spark plug wires. If necessary, twist to loosen. Then, pull straight out from the cap.

• Check for corrosion at connectors.

• If measured resistance is too high, wire assembly should be replaced.

Ignition Cable Resistance

• Plug connector to distributor cap end 3 kS2

Individual spark plug wire end connectors are available as replacement parts from an authorized Porsche dealer.

Spark Plug Wire Resistance Ohms
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Distributor cap, testing

^ To test cap and rotor, use flat-tipped screwdriver to press down and turn cap hold down pins Vt turn each.

• Detach spark plug wires and coil wire.

To avoid damaging the distributor cap, do not wiggle the connectors when removing the spark plug wires. If necessary, twist to loosen. Then, pull straight out from the cap.

Be sure to label the spark plug wires and their locations when disconnecting them from the cap.

• Check resistance of cap between tower and its matching contact inside cap. Resistance should be nearly zero ohms.

• If any resistance is detected, replace cap. Ignition rotor, testing

— After removing cap, pull rotor straight up off drive shaft.

^ Check rotor resistance with ohmmeter.

• If measured resistance is too high, replace rotor.

Ignition Rotor Resistance

How Check Rotor Resistance

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Ignition Schematic 911 Carrera

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Ignition Schematic 911 Carrera

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