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Re: In a 4.3L chevy engine, what are the two sensors on...
These are knock sensors which will detect engine rattlee or knocking and the pcm will then attempt things like ****** the timing to rectify the condition
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Nathan, 2 Knock's are located under intake manifold.
Check the attached links,
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The oil pressure sender is located on the back of the engine block, top center. If you look over the top of your intake manifold(you'll have to take the plastic cover off the top of the engine to see it) you can make out the plug sticking up in the back. It takes a large socket to remove, and is a very tight squeeze. The sensor looks like a black plastic cylinder sticking up in the back of the engine with a wire connector on it.
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