LSPI: Combustion Before the Spark
Use the verified English application data on this page and confirm vehicle, model year, market and powertrain identity before applying technical values.
Why does it feel mysterious?
Many faults are not static. Heat, moisture, load, vibration, network sleep/wake state or shared power can make the symptom disappear during testing.
How do you prove it?
Capture freeze-frame, supply voltage, voltage drop, waveform, network state and temperature/load at the moment of failure. Look for a repeatable relationship before replacing parts.
Diagnostic trap
Treating a DTC label as the failed part is a common mistake. The code usually describes a circuit or monitor; root cause may be wiring, mechanics, another module or operating conditions.
Related discovery routes
Sources & freshness
Exact technical values, prices and failure rates are not invented without verified vehicle/manufacturer evidence.