Where is the knock sensor located?

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

JACOBANDNICKOLAS

MECHANIC
109,874 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

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Monday, March 22nd, 2021 AT 7:12 PM

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.

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Friday, March 26th, 2021 AT 10:04 AM

JACOBANDNICKOLAS

MECHANIC
109,874 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

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