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.
2004 F150 XLT 5.4 4x4 3:55-Edge Evolution-Flowmaster 40 series si/do-K and N drop in airfilter-Gotts Mod-Kobalt Toolbox-Auto spring 2 inch leveling kit
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.
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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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??
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