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What is the torque specification on a 99 Chevy 1500 knock sensor?

There isn't a single, universally applicable torque specification for a 1999 Chevy 1500 knock sensor. The torque value depends on the specific knock sensor's threads and the material of the engine block. You will need to consult your vehicle's repair manual.

Repair manuals (like a Haynes or Chilton manual, or a factory service manual) will provide the exact torque specification for your particular truck's engine. Trying to find the information online without knowing the precise engine (e.g., 4.3L V6, 4.8L V8, 5.7L V8, etc.) is unreliable and could lead to damage.

Over-tightening a knock sensor can easily strip the threads or damage the sensor itself. Always use a torque wrench to ensure proper tightening.