Call Center Open | 866.350.4540
You are just $149.99 from Free Shipping within the contiguous U.S.

1990-1991 Corvette L98 Engine Knock Sensor

  • Photos
product image
Brand Logo ACDelco
Part #: 622-138
Availability: Currently Unavailable - Most out of stock items are available to ship within 7-10 days.
Fits Years:
  • 1990-1991
  • Description

1990-1991 L98 Engine Knock Sensor

1990-1991 Corvette EGR Pipe Heat Insulation Replacement Made Simple!

A fully functioning knock sensor is essential for maximum performance. It "listens" for engine knock often due to poor quality fuel. When it detects a "spark knock", it sends a signal to the ECM and an ignition timing correction is made to burn the fuel more efficently. With the aid of the Corvette Knock Sensor Tool and a digital voltmeter, you can easily test the knock sensor for peak performance. Instructions included.

Tech Note: As the Knock Sensor is really a simple form of microphone, it can't tell the exact source of a rythmic knocking sound. Loose exhaust shields and other equipment can often vibrate in sync with the engine and have been known to fool the knock sensor and make diagnosis dificult.

Also known under these part numbers:

  • 21392
  • 34667