Where is the knock sensor located?

Tiny
JUDY REIN DOLL
  • MEMBER
  • 2006 BUICK LUCERNE
  • V8
  • 140,000 MILES
Cannot locate knock sensor. Car listed above a CXS model with a NorthStar engine.
Monday, March 22nd, 2021 AT 1:49 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,427 POSTS
Hi,

On this engine (4.6L V8) there are two knock sensors. Both are located under the intake manifold. If you look at pic 1, I circled both.

Starting with pic two, are the directions and pics related to removal and replacement of the sensors.

Starting at pic 8, I included the directions for removal and replacement of the intake manifold. It needs to be removed to access the sensors.

I hope this helps. Let me know if you have other questions.

Take care,

Joe
Was this
answer
helpful?
Yes
No
+1
Monday, March 22nd, 2021 AT 7:12 PM
Tiny
JUDY REIN DOLL
  • MEMBER
  • 2 POSTS
Thanks for the response. Just wanted to know if I need to release the fuel pressure before beginning this job.
Was this
answer
helpful?
Yes
No
Friday, March 26th, 2021 AT 10:04 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,427 POSTS
Since the injectors and fuel rail need to be removed, it should be done. If you look at the pics below, they include the directions for releasing pressure.

I hope this helps.

Joe
Was this
answer
helpful?
Yes
No
Friday, March 26th, 2021 AT 10:57 AM

Please login or register to post a reply.

Sponsored links