Pre-ignition (LSPI)
Pre-ignition is ignition of the mixture before the spark plug fires, often caused by hot spots or oil droplets.
What is Pre-ignition (LSPI)?
Low-speed pre-ignition (LSPI) affects small turbocharged direct-injection engines under high load at low revs. Special oil specifications reduce LSPI risk. It is different from detonation, which happens after the spark. Glowing carbon deposits, overheated spark plugs with the wrong heat range and sharp edges in the combustion chamber are classic causes on older engines.
How it works
Something ignites the mixture early, so pressure rises while the piston is still moving up.
Why it matters for your car
LSPI can break pistons or rings in a single event. Use oils meeting the manufacturer's latest specification.
Other terms
- Brake Fluid Boiling Point
- Caster
- Child Lock (Child Safety Lock)
- Column Gear Shift
- DAB Digital Radio
- DC-DC Converter
- Exhaust Gas Temperature Sensor
- Hybrid Vehicle (HEV)
- Ignition Condenser (Capacitor)
- Infotainment Head Unit
- Paint Colour Matching
- Paint Thickness Gauge
- Performance Exhaust
- Regeneration Levels (Regen Settings)
- Roadside Assistance (Breakdown Cover)
- SAE Levels Of Driving Automation
- Service Indicator Reset
- Short Circuit
- Tyre Blowout
- Wheel Offset (ET)