Quote:
Originally Posted by cbh148
From what I've experienced, the knock sensor has never saved an engine of mine. I've always disabled them and never ran into any issues. Matter of fact, every time I've ever had one, I did have issues with them going bad and throwing the code (with the limp mode of course), or even better is when I've had one go bad but still be returning a signal to the ECU that was within the "possible" range, so it was basically telling the computer that it was knocking all the time (even when the engine was off haha) and pulling timing like crazy.
Martin was all for disabling the knock sensor. They're more for helping with saving the engine if non-premium gasoline is accidentally put in, rather than for saving the engine if it leans out spontaneously doing sportscar stuff.
Yeah I've heard that too -- that it gets ignored beyond some rpm.
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I find the knock sensor to be a VALUABLE TOOL when tuning with a real stand alone. With a real time stand alone you can drive the car, monitor your injector duty cycle and log all of your changes per unit time. Advance the ignition timing bit by bit, remove fuel, and watch your injector duty cycle drop during several consecutive highway drives for maximum fuel efficiency while avoiding the bleeding edge.
Furthermore, just because you are listening to the knock sensor, does not mean you have to react to it. In other words, if I had the option of knowing what it says, vs flat out removing it, I would rather simply have that additional data flowing in to react to if necessary. Just for curiosity sake I've put "bad" numbers in places to see if the knock sensor knows whats up... and it does. It always does. Just some food, it is a tool and should be treated like one.