| ACDELCO 21391 Specifications |
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| Terminal Type | Pin | | Wire Harness Included | No | | Connector Gender | Female | | Terminal Quantity | 1 | | Connector Quantity | 1 | | Connector Shape | Round | | Mounting Hardware Included | No |
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An ACDelco GM Original Equipment Ignition Knock (Detonation) Sensor monitors the engine for pinging or spark knock, and is a GM-recommended replacement for your vehicle's original component. The sensor creates a voltage signal based on the vibrations caused by erratic air/fuel mixture combustion; the engine control module uses this signal to adjust the ignition timing and air/fuel mixture. This original equipment ignition knock sensor has been manufactured to fit your specific GM vehicle, providing the same performance, durability, and service life you expect from General Motors.
Features & Benefits:- Undergo the same stringent testing process as the original part
- GM-recommended replacement part for your GM vehicle's original factory component
- Offering the quality, reliability, and durability of GM OE
- Manufactured to GM OE specification for fit, form, and function
 Tips & Tools For The Repair - Helpful Tools: A Scraper, to remove carbon deposits on the engine; Intake Valve Cleaner, to clean the Intake Manifold; a Torque Wrench, to tighten the sensor(s) according to OE specifications.
- Replace all Knock Sensors together while you already have the intake removed. Engines typically have one knock sensor per bank.
- Old, brittle connectors often break during installation or removal - replace the corresponding Knock / Detonation Sensor Connector (found in the "Electrical-Connector" category) to prevent failure.
ACDelco Quality ACDelco breaks down their premium portfolio of Original Equipment and Aftermarket parts into two tiers: GM Original Equipment and ACDelco Gold.
| GM ORIGINAL EQUIPMENT |
| GM Original Equipment parts are the true OE parts installed during production or validated by GM—designed, engineered, and tested to rigorous standards and backed by General Motors. |
| ACDELCO GOLD (PROFESSIONAL) |
| ACDelco Gold parts are the high-quality alternative to OE parts, manufactured to meet GM expectations for fit, form, and function and backed by General Motors. |
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| OEM / Interchange Numbers: 10456019 |
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