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02 Response LX knock sensor weirdness…


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Posted (edited)

I’ll start by saying I suspect a bad ground somewhere, but the weirdness is worth describing…

There is a sensor on the right side of the block. It is screwed into a water galley. When I fiddle with the connection, the oil pressure gauge works. Otherwise, no oil pressure reading. That sensor is a knock sensor and has nothing to do with the oil pressure sensor or sending unit, which is on the other side of the block.

Question: why would it’s having a bad connection at the knock sensor affect the oil pressure gauge? Bad ground somewhere is the only solution I can think of… However, the sensor I removed from the block is pretty cruddy; so, I’m replacing it. Part number off the sensor is 10456126.

Thanks, 

‘Bill
 

 

Edited by motobill
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4 hours ago, motobill said:

I’ll start by saying I suspect a bad ground somewhere, but the weirdness is worth describing…

There is a sensor on the right side of the block. It is screwed into a water galley. When I fiddle with the connection, the oil pressure gauge works. Otherwise, no oil pressure reading. That sensor is a knock sensor and has nothing to do with the oil pressure sensor or sending unit, which is on the other side of the block.

Question: why would it’s having a bad connection at the knock sensor affect the oil pressure gauge? Bad ground somewhere is the only solution I can think of… However, the sensor I removed from the block is pretty cruddy; so, I’m replacing it. Part number off the sensor is 10456126.

Thanks, 

‘Bill
 

 

I don't recall how the knock sensors work, but if they are normally closed it could be providing the engine ground to the ECM.  You should have a ground lug on the back of the starboard engine head.  Remove the nut and clean everything, then tighten the nut again.  Light spray oil on the whole engine can help keep water and oxygen from making cruddy connections.

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