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 6:49 AM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 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
Mar 22, 2021 at 12:12 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 3:04 AM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 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
Mar 26, 2021 at 3:57 AM
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