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Knock sensor question

Old Jul 12, 2020 | 09:41 AM
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Default Knock sensor question

Will a exhaust pipe rubbing cause the knock sensors to pull timing and retard the engine? I'm shaking out my swap and I suspect this could be a cause of the engine stumbling upon acceleration. Pipe is hitting the trans cross member as I tucked everything in as tight as I could and have a small area that's definitely rubbing/hitting with engine/trans movement.
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Old Jul 12, 2020 | 10:40 AM
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While I don't know if the vibration could cause a knock sensor reaction (doubt it - they're looking for VERY specific 'noise' in a certain frequency) -- I don't think the knock sensor signal would result in pulling so much timing or changing fuel mixture so much that the engine would actually stumble. Have you pulled codes?
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Old Jul 12, 2020 | 10:47 AM
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In any case remove it as a variable.
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Old Jul 12, 2020 | 10:48 AM
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Not throwing any codes
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Old Jul 12, 2020 | 11:39 AM
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Rubbing and hitting are two different things. Hitting COULD affect a knock sensor, depending on the sharpness/severity of the hit. Rubbing, not so much.
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Old Jul 12, 2020 | 11:56 AM
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I'll call it a hit.
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Old Jul 12, 2020 | 07:38 PM
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Regardless the car is back on the lift stands and the exhaust is getting some more love.
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