Description
SIERRA Engine Ignition Analyzer – 18-9903 is a handheld diagnostic instrument for isolating ignition faults such as no-starts, intermittent misfires, weak coils, damaged plug wires and fouled spark plugs.
It displays live ignition information on a color screen and supports conventional plug-wire and coil-on-plug testing using the included pickups.
Key Features
- Displays real-time ignition waveforms for diagnostic comparison
- Measures and graphs burn time, spark voltage, dwell and engine RPM
- Supports both plug-wire and coil-on-plug ignition systems
- Rechargeable lithium-ion battery provides more than six hours of operation
- Includes probes/pickups, USB charger, protective holster and padded carrying case
Specifications
- Manufacturer Part Number: 18-9903
- Product Type: Engine ignition analyzer
- Display: 3.5 in. color TFT
- Power: Rechargeable Li-ion battery; 6+ hour operating time
- Applications: Spark-ignition engine diagnostics

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