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Torque Technical BulletinsMASTER MECHANIC VERIFIED7 MIN READ
How CAN-Bus Scope Data Logging Pinpoints Intermittent Misfires
Technical Specifications & Target Criteria:
Author:Mark Reynolds, Lead Diagnostic Specialist
Intermittent misfires that do not illuminate a hard Check Engine light are the bane of modern automotive diagnosis. Generic OBD-II code readers only read buffered codes, missing high-speed transient voltage drops and micro-second coil insulation breakdown.
By connecting a 4-channel lab oscilloscope directly to the ignition coil control lines and injector current clamps, our technicians capture million-sample-per-second waveforms, revealing insulation breakdown and driver transistor lag instantly.
Scope Diagnostics Checklist
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Step 1: Capture secondary ignition burn time and kv firing spikes under sudden snap throttle.
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Step 2: Measure primary injector current ramps for mechanical pintle sticking.
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Step 3: Graph CAN-High and CAN-Low differential voltages to rule out communication bus shorts.
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Step 4: Check ECM power and ground voltage drops under heavy electrical accessory load.
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