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Where is the Knock sensor located?

Tiny
JERS76
  • MEMBER
  • 2008 CHEVROLET IMPALA
  • 3.8L
  • AUTOMATIC
  • 145,000 MILES
Do you have diagrams of the knock sensor locations?
Wednesday, October 30th, 2024 AT 10:09 AM

4 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
https://www.2carpros.com/articles/how-a-knock-sensor-works
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Wednesday, October 30th, 2024 AT 1:59 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
The knock sensors are on the engine block. The left one is just above the starter while the right side is under the converter and behind the oil filter. The left side isn't hard to get to, you just disconnect the electrical connector and unbolt it. When you tighten the new one down the bolt is torqued to 18 ft lb. The right side is worse, you need to unbolt the converter to get to the head of the bolt, then it's the same as the opposite side. You can get to both from under the car.
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Wednesday, October 30th, 2024 AT 1:59 PM
Tiny
JERS76
  • MEMBER
  • 2 POSTS
Thank you! I appreciate you! Have a great day!
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Wednesday, October 30th, 2024 AT 3:42 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
You are welcome.
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Thursday, October 31st, 2024 AT 9:20 AM

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