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Old 08-08-2011, 02:38 PM   #1
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Default Knock sensors

Well my truck is throwing a code for a knock sensor. My question is what will happen if I don't change them. You have to take the intake manifold off to replace them and I'm not sure its worth the cost or trouble.
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Old 08-08-2011, 03:28 PM   #2
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Is your engine knocking?

What code is being thrown?

If you don't change it... It will probably keep throwing the code. But I've come to find out that just because a code is thrown for.one thing, doesn't mean that's the problem with these trucks.
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Old 08-08-2011, 03:34 PM   #3
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In other words, are the codes indicating that your engine is knocking, meaning the knock sensors are doing their job correctly?

Or are you saying there's a code that says the knock sensor(s) are bad?
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Old 08-08-2011, 03:46 PM   #4
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It P0330 knock sensor 2 circut. I can clear the code and it comes right back. And yes my camphasers knock like hell.
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Old 08-08-2011, 03:51 PM   #5
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After simply typing in "P0330" into the google search window, the second entry provided a link that stated:


A code P0330 most likely means one or more of the following has happened:Possible Solutions
  • Check the resistance of the knock sensor on bank 2 (compare it to factory specs) Check for broken/frayed wires leading to the sensor
  • Replace the knock sensor on bank 2
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Old 08-08-2011, 04:06 PM   #6
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Yes I already searched it. My question is. Is the knock sensors important enough to replace. I can live with a CEL.
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Old 08-08-2011, 04:10 PM   #7
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If you don't care about trashing your engine then no their not important. Sensors provide feedback to the pcm to add/subtract timing and change other variables to keep the engine running properly and keep the engine from destroying itself.
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Old 08-08-2011, 04:13 PM   #8
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So in simple terms, if they are malfunctioning, your engine can knock, and the PCM would not know to retard the timing, causing additional knock, possible holes in your pistons from the detonation, valve seat damage from the valves being pushed back into their seats, and lousy performance.

I'd see if they are indeed bad, and replace them if so.
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Old 11-22-2011, 10:44 AM   #9
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I'm having the same problem with my 94 5.0 its sending a code for the knock sensor and the engine is pinging here and there and extreme power loss. I was wonder what exactly does a knock sensor actually do??
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Old 11-22-2011, 09:10 PM   #10
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You should change it. Over time they corrode and it stops sending the right signals.
It makes your ecu think your engine is knocking and retards the timing. This decreases power and economy. It's a bitch to change, but worth it. If you're handy around your car, you can get it done in an hr or 2
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