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will bad knock sensor knock down hp

This is a discussion on will bad knock sensor knock down hp within the General Help forums, part of the LSx Technical Help Section category; I recently had my 98 trans am dyno'd, and it only put out 263 hp and 284tq. The car seems ...

  1. #1
    Junior Member zaaronz's Avatar
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    will bad knock sensor knock down hp

    I recently had my 98 trans am dyno'd, and it only put out 263 hp and 284tq. The car seems to run fine, only thing wrong with it is it threw a code for a bad knock sensor a few weeks ago. Just wondering if a bad knock sensor could be the reason for the low hp? btw-car is bone stock, 143k, a4.

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    Junior Member zaaronz's Avatar
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    anyone??????

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    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
    98' trans am

    knock will hurt your numbers as it will cut timing ..id replace it no matter what and re-dyno..146k is a lot of miles and i wouldnt be surprised if your engine is just tired or at the very least..your sensors are tired

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    its short but its skinny. jiveass's Avatar
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    pewter
    99 trans am

    hellz yea knock sensor is vital to correct engine timing....not sure where its located on an ls1, but its under my intake manifold on my truck.....

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    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
    98' trans am

    there are two of them located in the valley cover underneath your intake manifold..take the manifold off..pry the black covers off and replace the sensors and inspect the wiring



    here is a shot of my engine you see the two knock sensors ?

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    Life in the Fast lane sunsetorangess's Avatar
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    Quote Originally Posted by jiveass View Post
    hellz yea knock sensor is vital to correct engine timing....not sure where its located on an ls1, but its under my intake manifold on my truck.....
    Yepp there important, and your correct located under the intake manifold.
    While your there it may be time to upgrade to a ls6 manifold.
    J
    2001 SS, Its not the car its the Driver that matters....

  7. #7
    Junior Member zaaronz's Avatar
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    yeah i was planning on upgrading to a ls6 intake since i gotta pull mine off anyway to replace the knock sensors. Im sure hoping that its the knock sensors thats knocking my hp down and not just a weak old motor. It did feel like i lost power tho as soon as i threw a code for em.

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    Moderator Cutlass's Avatar
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    I believe when the knock sensor codes set, the engine runs off the low octane spark table. So yes, that will kill the hp numbers

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    Veteran 0rion's Avatar
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    moisture may be the culprit but at that mileage it could also just be time. Do you wash the engine down with water?

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    Junior Member zaaronz's Avatar
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    Quote Originally Posted by 0rion View Post
    moisture may be the culprit but at that mileage it could also just be time. Do you wash the engine down with water?
    Yeah im sure i ruined the knock sensor, if thats what your asking. The engine was really dirty so i washed it and soon after is when my knock sensor went out. I found out later by doing some reading thats its easy to mess em up by spraying water there. O well i learned that the hard way- but at least its clean under the hood now lol

  11. #11
    Veteran 0rion's Avatar
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    Quote Originally Posted by zaaronz View Post
    Yeah im sure i ruined the knock sensor, if thats what your asking. The engine was really dirty so i washed it and soon after is when my knock sensor went out. I found out later by doing some reading thats its easy to mess em up by spraying water there. O well i learned that the hard way- but at least its clean under the hood now lol
    don't feel bad....you're not the first to do that.

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    you mean they actually rust????


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