Operation CHARM
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Porsche
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1987
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928 S4 V8-4957cc 5.0L
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Repair and Diagnosis
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Powertrain Management
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Ignition System
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Technical Service Bulletins
Ignition System: Technical Service Bulletins
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By Symptom
Out of specification
Fuel/Ignition Modules - Use of Aftermarket Microchips
Shorted/Open circuit
Ignition System - Malfunctioning
All Technical Service Bulletins
Ignition System - Malfunctioning
Fuel/Ignition Modules - Use of Aftermarket Microchips
Engine Performance - Tune Up Specifications
Spark Plugs - Revised Plugs and Tightening Torque
Spark Plugs - Install With Threads Clean and Dry
EZK Control Unit - Revised Part and Wiring Harness