G4+ KnockBlock Engine Knock Detection Tool The G4+ KnockBlock is designed to assist in the detection of engine knock and related mechanical issues. Featuring a rugged CNC aluminium enclosure and special filtering technology, this tool enables users to monitor engine noise through headphones or ear protection devices. The KnockBlock is compatible with all OEM knock sensors and includes a rechargeable lithium battery for extended operation. Key Features Supports monitoring of one or two knock sensors Special filtering design to improve signal-to-noise ratio Compatible with ear-buds, headphones, or noise cancelling ear muffs Long-life lithium rechargeable battery CNC aluminium enclosure Flying lead headphones connector Works with all OEM knock sensors Can interface directly to a laptop for recording or frequency analysis (using PCLink G4+) 3.5mm audio jack for headphone connection Mini USB connector for charging (2.1A at 5V max) LED indicator for operation and charging status What's Included G4+ KnockBlock 2 sensor looms (attached) 1 headphone loom (attached) Quick Start Guide 1 mini USB cable 2 Bosch type doughnut OEM knock sensors 2 small Link Engine Management stickers Vehicle Fitment Not specified by manufacturer Installation Notes Install knock sensors on a solid mounting point on the engine block near the cylinder head If only one sensor is used, leave the unused sensor cable disconnected Turn the volume control clockwise until it clicks to power on; the LED indicator will turn blue Set volume to minimum before connecting headphones to the 3.5mm audio jack Run the engine and gradually increase volume to a comfortable listening level To charge, turn off the KnockBlock and connect the mini USB cable to a standard USB charger (2.1A at 5V max) LED indicator shows red while charging and turns off when fully charged Charge the KnockBlock after use and before storage Headphones with their own noise filtering may be unsuitable for use with the KnockBlock