REDZMAN

The one on your strut tower is an acceleration sensor, not a knock sensor.

Tibbiette

thanks guys for clearing that up

wec2002

Redz, you are correct that the one on the strut tower is called an acceleration sensor, but its purpose is to detect vertical movement, i.e. bumps in the road. "The acceleration sensor is used to sense rough road conditions. The sensor's signal is used by the Engine Control Module (ECM) to prevent wrongful misfire detection." That sensor along with the Knock sensor, which is located just behind the cam belt cover on the rear of the engine, allow the ECM to determine what is actually a misfire or predetection and what was just another streach bad road. Hyundai does it a little different than some other car makers, not to say it's better or worse, just different.

CyberShark

I see, both sensors work in conjuction to fullfill the same purpose, allowing the ECM to make the correct adjustments.. very good.

Sparticus

i've also heard it called the knock reference sensor

TiburonWao

Thanks... I will check tomorrow...... hope to find it....