Where is the knock sensor located?

2006 BUICK LUCERNE
140,000 MILES • V8
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JUDY REIN DOLL
  • MEMBER
  • 2 POSTS
Cannot locate knock sensor. Car listed above a CXS model with a NorthStar engine.
Mar 22, 2021 at 1:49 PM
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JACOBANDNICKOLAS
  • ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
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
Mar 22, 2021 at 7:12 PM
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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.
Mar 26, 2021 at 10:04 AM
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JACOBANDNICKOLAS
  • ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
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
Mar 26, 2021 at 10:57 AM
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