ZR-1 Net Registry Forums - View Single Post

Aurora40 · 07-24-2011

Hey Tom, those are exactly what you should look for. When there are knock events, the "Knock Counts" should increment. This should also trigger knock retard, and the timing advance will be decreased.

In addition to the knock sensor on a '90, there is a piece of circuitry that filters the sensor events and turns them into feedback to the ECM. It's on the passenger side of the engine bay, a sort of flat square piece. I can't think of the name of it at the moment.

I believe the car tests the knock sensor by intentionally advancing the timing until knock should happen, then checking to see if it gets feedback.

07-24-2011	#2
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,704	Re: spark knock problem Hey Tom, those are exactly what you should look for. When there are knock events, the "Knock Counts" should increment. This should also trigger knock retard, and the timing advance will be decreased. In addition to the knock sensor on a '90, there is a piece of circuitry that filters the sensor events and turns them into feedback to the ECM. It's on the passenger side of the engine bay, a sort of flat square piece. I can't think of the name of it at the moment. I believe the car tests the knock sensor by intentionally advancing the timing until knock should happen, then checking to see if it gets feedback.