Can heavy Vibrations Cause Knock?

[lasvegastalon]

I researched this topic before, but never came to a solid conclusion on if heavy rattling of car parts can set off the knock sensor.

 

[DanThMan1983]

Well yeah but whats rattling? Normally under alot of knock your going to feel a big hesitation and it may feel like the car is shaking.

 

[FORMONTOYA]

Yes. But how do you know you have knock retard problems?

 

[DanThMan1983]

Yes. But how do you know you have knock retard problems?

that would be my next question. you got a logger?

 

[JayRolla]

If the knock sensor is torqued right your motor vibrations should not effect the knock sensor. It reads inside the block not outside it, but if its bad enough of vibration it may pick it up. If your retarding real bad then the motor should lose lots of power and make it feel like the turbo does nothing. It shouldnt cause it to vibrate though.

 

[GVR4592]

A vibration is not going to set off the knock sensor.

 

[bojanglesracing]

A vibration is not going to set off the knock sensor. It's a microphone, not a vibration sensor.

Yea but if the vibration is bad, Would it not cause something to knock?

 

[GVR4592]

That last statement I made was incorrect, I'll clarify. The knock sensor is technically a vibration sensor but not how most people think it is. It's "tuned" to only pick up a specific range of vibrations. If you have a bad vibration from tires, or U-Joints, or stiff motor mounts, it's not going to set off the knock sensor.

 

[lasvegastalon]

Yeah...that's actually how i know i have knock. I get a count of 1 to 5 on there that i can't feel on the car... then when it gets to 15 to 25 i feel it on the car...and sometimes....well... you don't want me to tell you the count.. =( So yeah... i can do a pull on it and post some info if that would help... would love to know what the problem is (or at least get closer to the answer)